carpentaria gold pty ltd ravenswood gold mine underground

Big Dog Hydrogeology Pty Ltd 135 Burgoyne Road Albany WA 6330 [email protected]

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Carpentaria Gold Pty Ltd Ravenswood Gold Mine Underground Water Impact Report for Buck Reef West Pit

Report Status

Revision Date Signature

Rev A (Draft) March 2020

Rev 0 (Final) June 2020 Rev 1 (Final June 2020 Rev 2 (Final June 2020

Rev 3 (Final) June 2020

Big Dog Hydrogeology

BRW Pit Initial UWIR Rev 3 (Final)

EXECUTIVE SUMMARY Carpentaria Gold Pty Ltd (Carpentaria Gold) operate mining and processing operations at the Ravenswood Gold Mine, located at the town of Ravenswood, 90 km south of Townsville in North Queensland. The modern mining operations commenced in 1987 and have included the operation of eight open pits and four underground mines over the modern mining period. These modern operations have included an existing open pit (the Buck Reef pit) and an underground operation at the Buck Reef Mine. Carpentaria Gold have permitted an expanded mine plan which will include mining of the Buck Reef West pit (BRW pit) and eventual use of the mined out BRW pit for tailings storage. Throughout this report Buck Reef pit refers to the existing pit and BRW pit refers to the planned pit.

Mining of the BRW pit will require low rates of dewatering to remove groundwater inflow and surface water runoff and allow safe mining. Taking of underground water from the mining leases at the BRW pit (which represents associated water which is required to be removed to allow safe mining of the mineral resource) will make use of underground water rights conferred on Carpentaria Gold as holders of the mining lease by the Mineral Resources Act. Prior to exercising these water rights Carpentaria Gold are required to submit an initial Underground Water Impact Report (UWIR) to the Office of Groundwater Impact Assessment (OGIA). This report has been compiled by Big Dog Hydrogeology Pty Ltd (BDH) on behalf of Carpentaria Gold, and represents the initial UWIR for BRW pit dewatering.

In September 2019, the lake in the existing Buck Reef pit was partially pumped out to facilitate improvement to groundwater quality in the area. The cumulative take of underground water from 4 October 2019 to 21 February 2020 was 129,004 m3. The existing Buck Reef pit lies wholly within existing Mine Leases 1380 and 1532 which were issued prior to 2016. The pump has been decommissioned and further take of underground water is not planned until mining commences.

The total amount of groundwater taken during the 51 months of planned mining at the BRW pit is estimated to be 1,274,900 m3. The average inflow rate during the 51 months of mining is estimated to be 9.5 L/s. The total amount of groundwater taken during the first 36 months of mining (the period covered by the initial UWIR) is estimated to be 730,000 m3. Due to the conservative nature of the model employed to make the predictions, these volumes should be considered upper estimates.

The hydrogeology of the Buck Reef Mine is well understood from the data available from the 130 monitoring bores that were present in 2017 at the Ravenswood Mine, data collected during the installation of an additional 60 bores in 2017 and 2018, and from the detailed monitoring and interpretation undertaken from 2017 to 2019. This monitoring includes the influences of open pit and underground mining at the Buck Reef Mine, the influence of mining and tailings storage in the Sarsfield/Nolans pit, and the influence of pumping out the Buck Reef pit at the end of 2019. Groundwater transmission occurs close to the Top of Fresh Rock (TOFR), which is present at between 10 m below ground level (mBGL) and 15 mBGL. This main groundwater transmission zone is referred to as the TOFR aquifer and includes the weathered tonalite above the TOFR and the skin of fracturing below the TOFR. The TOFR aquifer typically occurs between 5 mBGL and 20 mBGL. Limited groundwater flow may occur in the underlying deep tonalite, largely controlled by the presence of underground workings, or potentially by localised zones of fracturing. Regionally extensive zones of fracturing in the deep unweathered tonalite have not been identified during exploration and mining.



Modelling of the drawdown influence in the TOFR aquifer of mining the BRW pit has been undertaken using a combination of an analytical model and the construction of two SeepW sectional groundwater models. The analytical model assumes uniform conditions in all directions from the BRW pit. The SeepW models simulate variable hydraulic properties along a section constructed through the BRW pit. In combination these models identify that the Immediately Affected Areas (IAA) and the Long Term Affected Areas (LTAA) are expected to be identical and extend around 400 m from the centre of the BRW pit. These modelling results are consistent with (and indicated to be conservative) the observed responses to mining of the Sarsfield/Nolans pit located 700 m east of the BRW pit. There are two unused and unregistered water supply bores within the IAA (School_01 and Loop_01) and there is one unregistered water supply bore which is no longer in use within the IAA (Elliot_01). There are no springs or seeps within the IAA and groundwater is more than 10 m below surface within the IAA. The closest location to the BRW pit at which groundwater seepage to surface could potentially occur is in the reach of Elphinstone Creek from the confluence with Suhrs Creek to the confluence with One Mile Creek. The risk to surface water environmental values in this location from mining the BRW pit is low, as the area is outside the IAA, groundwater seeps and springs are identified to be a small contribution to the observed trickle flows, and the SeepW models indicate losses of streamflow to the groundwater system in the event of drawdown reaching this point would be in the range 0.2 L/s to 0.3 L/s. Water balance modelling for the BRW pit has confirmed that it will act as a groundwater sink during mining, during tailings storage, and during long term closure. This is due to the large area of the planned lake above the tailings and the high rate of evaporation compared to groundwater inflows. The BRW pit therefore will not affect groundwater chemistry in the TOFR aquifer and the monitoring strategy is targeted at measuring groundwater elevations within the IAA, outside the IAA, and in bores located between the IAA and the potential locations of springs and seeps within Elphinstone Creek. Components of the monitoring strategy specifically addressing dewatering impacts will comprise:

• Measuring groundwater depth in 27 monitoring bores surrounding the BRW pit every three months. • Measuring groundwater depth in 4 monitoring bores potentially within the BRW pit at three monthly

intervals until they are decommissioned or become inaccessible due to mining. • Surveying the elevation of the lake in the Buck Reef pit, the lake in the BRW pit and the lake in the

Sarsfield/Nolans pit at monthly intervals when a lake is present. • Measuring groundwater depths in 21 water supply bores in the general region of the BRW pit at three

monthly intervals, when access is available and when permission can be received from the owners. • Monitoring at surface water monitoring sites as required by the Environmental Authority (EA) and the

Receiving Environment Monitoring Plan (REMP). • Installing a cumulative flow meter on the pumping system transferring water from the BRW pit to the

Processing Plant and recording the cumulative volume of water take on a weekly basis during pumping operations.

Monitoring of potential groundwater spring and seeps within Elphinstone Creek will be undertaken as described in the REMP and will comprise monitoring of surface water chemistry, water quality profiling, aquatic macroinvertebrates and fauna, sediment pore water chemistry, sediment geochemistry and a site condition assessment of the bed and banks on two occasions during each dry season.



In addition to the groundwater monitoring required to address the requirements of the UWIR and described in this document, groundwater chemistry monitoring will be undertaken downgradient of the Buck Reef Mine facilities. This groundwater chemistry monitoring is specified in the EA, and is further described in the Groundwater Management Program (BDH, 2020). Potential drawdown in the TOFR aquifer due to mining the BRW pit is well understood from observations during mining of the Buck Reef pit, the Buck Reef underground mine and the Sarsfield/Nolans pit. The potential for environmental values for groundwater and surface water to be affected by BRW pit dewatering has been investigated and assessed to be low. It is therefore proposed that groundwater monitoring data collected for the initial UWIR will be reviewed and interpreted every 12 months rather than every six months, and will be combined with the annual groundwater analysis which is required to be undertaken under condition E61 of the EA. The first annual groundwater analysis is required to be undertaken using data collected to September 2020.



TABLE OF CONTENTS EXECUTIVE SUMMARY .............................................................................................................................. 2

TABLE OF CONTENTS ................................................................................................................................ 5

1. Introduction............................................................................................................................................ 7

1.1 Background .................................................................................................................................... 7

1.2 Previous works and future mine plan for BRW pit ........................................................................... 7

1.3 Relevant investigations and sources of data ................................................................................... 8

1.4 Compliance of UWIR with guidelines .............................................................................................. 9

2. Part A – Underground water extractions .............................................................................................. 11

2.1 Historical underground and open pit mining .................................................................................. 11

2.2 Pit dewatering in 2019 .................................................................................................................. 11

2.3 Estimated pit dewatering to 2024.................................................................................................. 12

2.4 Long term water and tailings storage ............................................................................................ 13

3. Part B – Aquifer information and underground water flow .................................................................... 14

3.1 Background and geology .............................................................................................................. 14

3.2 Drilling and monitoring observations ............................................................................................. 14

3.3 Groundwater elevations and flow directions ................................................................................. 15

3.4 Groundwater discharge ................................................................................................................ 17

3.5 Summary of hydrogeological model .............................................................................................. 18

4. Part C – Predicted water level declines for affected aquifers ............................................................... 19

4.1 Interactions between the planned BRW pit and the aquifers ......................................................... 19

4.2 Bore census ................................................................................................................................. 19

4.3 Modelling of the affected area during mining ................................................................................ 23

4.4 Assessment of surface subsidence .............................................................................................. 25

4.5 Bores potentially in the affected area ............................................................................................ 26

4.6 Springs and seeps potentially in the affected area ........................................................................ 26

5. Part D – Impacts on environmental values .......................................................................................... 28

5.1 Sources of data ............................................................................................................................ 28

5.2 Environmental values ................................................................................................................... 28

5.3 Potential impacts .......................................................................................................................... 28

6. Part E – Water monitoring strategy ...................................................................................................... 31

6.1 Background .................................................................................................................................. 31

6.2 Rationale ...................................................................................................................................... 31

6.3 Strategy ........................................................................................................................................ 31

6.4 Timetable ..................................................................................................................................... 32

6.5 Reporting program ....................................................................................................................... 34



7. Part F – Spring impact management strategy ...................................................................................... 35

7.1 Background .................................................................................................................................. 35

7.2 Assessment of springs ................................................................................................................. 35

7.3 Management and monitoring strategy .......................................................................................... 36

References ................................................................................................................................................. 37

List of Figures ............................................................................................................................................. 38

Appendix A Bore construction details

Appendix B Groundwater inflow observations during drilling



1. Introduction

1.1 Background Carpentaria Gold Pty Ltd (Carpentaria Gold) operate mining and processing operations at the Ravenswood Gold Mine, located at the town of Ravenswood, 90 km south of Townsville in North Queensland. There is a long history of mining and processing in the Ravenswood area, with alluvial mining commencing in 1868 and hard rock mines operated from 1870. The modern mining operations commenced in 1987 and have included the operation of eight open pits and four underground mines over the modern mining period. These modern operations have included an open pit and an underground operation at the Buck Reef Mine. Ore from the various mines and stockpiles is processed via the Nolans crushing facility and processing plant, with tailings currently deposited in the Sarsfield/Nolans pit.

Carpentaria Gold have permitted an expanded mine plan which will include removal of tailings from the Sarsfield/Nolans pit, expansion of the Sarsfield/Nolans pit, mining of the Buck Reef West pit (BRW pit), construction of the New Buck Reef Waste Rock Storage Facility (WRSF), expansion of the existing Nolans Tailings Storage Facility (NTSF expansion) and eventual use of the mined out BRW pit for tailings storage. Throughout this report Buck Reef pit refers to the existing pit and BRW pit refers to the planned pit.

Mining of the BRW pit will require low rates of dewatering to remove groundwater inflow and surface water runoff and allow safe mining. Taking of underground water from the mining leases at the BRW pit (which represents associated water which is required to be removed to allow safe mining of the mineral resource) will make use of underground water rights conferred on Carpentaria Gold as holders of the mining lease by the Mineral Resources Act. Prior to exercising these water rights Carpentaria Gold are required to submit an initial Underground Water Impact Report (UWIR) to the Office of Groundwater Impact Assessment (OGIA). The initial UWIR is required to describe the hydrogeological conditions at the BRW pit, quantify the expected rates at which groundwater will be taken over the next three years, define the area which will be affected by taking the underground water, and describe the management of any potentially affected groundwater users and environmental values in that affected area.

This report has been compiled by Big Dog Hydrogeology Pty Ltd (BDH) for Carpentaria Gold, and represents the initial UWIR for BRW pit dewatering.

1.2 Previous works and future mine plan for BRW pit The Buck Reef Mine lies within a historic mining area located immediately to the south of the Ravenswood township as indicated in Figure 1. The existing Buck Reef pit is located 700 m west of the Sarsfield/Nolans pit which is currently being used for tailings deposition. The Suhrs Creek Dam lies 3 km northeast of the Buck Reef pit and contains water pumped from the Burdekin River. Surface water flow in the Buck Reef Mine area is towards Elphinstone Creek. Active and abandoned monitoring bores which are available to define groundwater conditions in the general area are identified in Figure 1.

Figure 2 provides more detail of the extent of the existing Buck Reef pit, the existing underground workings, and the planned infrastructure to support the BRW pit. Although small scale mining above the water table was undertaken in the Buck Reef area from 1868, deep underground mining below the water table in the area of Buck Reef did not occur until the period 1899 to 1917. In that period multiple underground mines were developed near Buck Reef to depths of over 100 m below ground level (mBGL) and up to 500 mBGL.



Modern mining of the Buck Reef pit commenced in 1987, and the pit reached an elevation of around 210 mAHD or 50 mBGL. Subsequently the modern Buck Reef underground mine was developed using a decline from the pit, with an existing historical shaft (the Grant and Sunset Extended) also used for access. Two vent shafts (VS001_SAR and VS002_SAR in Figure 2) which were constructed for the underground mine were not sealed at the end of mining and remain accessible for monitoring the underground workings. The modern Buck Reef underground workings broke into underground workings associated with the historical General Grant, Sunset and Duke of Edinburgh mines. The modern underground mining extended down to around -30 mAHD, equivalent to a depth of around 300 mBGL, and was largely completed in 1993, although further underground operations occurred in 2000.

Under the current mine plan the BRW pit will be completed with a deepest elevation of around 0 mAHD and the pit will therefore extend 210 m below the current Buck Reef pit and will reach 260 mBGL. Mining of the BRW pit is expected to commence in 2020 and the base of the pit will be advanced to 180 mAHD within 13 months of the commencement of mining, after which cutbacks will occur, with subsequent stages of mining advancing the pit floor from 180 mAHD to 110 mAHD between 20 and 32 months of mining, and advancing the pit floor from 110 mAHD to 0 mAHD between 41 and 51 months of mining. Completion of the mine plan is therefore currently expected to occur during 2024. Mining of the BRW pit will require the groundwater elevation to be held around 10 m below the base of the pit, to allow dry conditions in blast holes and grade control holes drilled as part of the mining process. The groundwater elevations required to be achieved during mining for the mining advance rate are discussed in Section 2.3. The location of the pit crest at full development is illustrated in Figure 2 along with the other facilities required for mining (bunds and the New Buck Reef WRSF). The planned BRW pit will mine through most of the modern underground workings.

From 2024 onwards, the BRW pit may be used for the temporary storage of excess water within the overall mine water balance. This will allow flexibility for the management of flows generated during dewatering and mining in the Sarsfield/Nolans pit from 2024 to 2027. From 2028 to 2030 the BRW pit is planned to be used for the sub-aqueous deposition of tailings. Throughout the period of potential water storage and tailings storage the lake in the BRW pit will be actively maintained at an elevation which ensures that the pit acts as a groundwater sink (groundwater flow will be from the groundwater system into the pit, and there will be no flow of water stored in the pit out into the groundwater system). The pit will also be operated to ensure that the stored tailings are permanently submerged and protected from oxidation.

1.3 Relevant investigations and sources of data Over the historical and modern mining periods there have been a wide range of hydrogeological investigations completed at the Buck Reef Mine. Investigations undertaken during modern mining by Carpentaria Gold which are relevant to the understanding of the hydrogeology of the area and relevant to the implications of dewatering of the BRW pit are summarised as follows:



• An extensive investigation into groundwater conditions undertaken from 2017 to 2019, which was used as the basis to update the groundwater conditions in the Environmental Authority (EA). Components of this program included:

Investigation of 130 groundwater monitoring bores which were present in 2017. Installation of around 60 additional monitoring bores during 2017 and 2018. An assessment of the hydrochemistry and geochemistry of potential seepage sources. Groundwater monitoring in 2017 and 2018 applying an expanded analytical hydrochemical

suite. • Buck Reef Expansion Hydrogeological Investigation (SLR, 2017). In 2017 Carpentaria Gold applied

to DES to modify the Environmental Authority (EA) for the mining operations to allow mining of the BRW pit. Appendix D of the application was a hydrogeological report compiled by SLR Consulting, which included modelling of the potentially affected area for dewatering of the BRW pit.

• BRW pit tailings storage designs (SRK, 2018). SRK completed designs for the placement of tailings in the BRW pit following mining, which included the maximum planned tailings elevation, and the construction of a water balance model which confirmed that the pit would act as a hydraulic sink during tailings storage.

• Routine groundwater monitoring by Carpentaria Gold. The monitoring of groundwater elevations and groundwater quality in the bores illustrated in Figure 1 provides an understanding of the regional and local hydrogeology, and in particular includes:

Monitoring during mining and tailings storage in the Sarsfield/Nolans pit which confirms that this pit, which intersects the same hydrogeological conditions as the BRW pit, has acted as a groundwater sink.

Monitoring of typical groundwater conditions at the Buck Reef Mine in the absence of mining. Monitoring of groundwater conditions at the Buck Reef Mine during dewatering of the existing

Buck Reef pit at the end of 2019. • Groundwater Management Plan (GMP, BDH, 2020). This document describes the monitoring of

groundwater chemistry which is required to be undertaken under the EA and will be used to identify any influence of the mine facilities on the receiving groundwater environment. The locations at which groundwater chemistry is required to be monitored near the Buck Reef Mine facilities include three compliance bores, one operational bore, and thirteen interpretation bores.

1.4 Compliance of UWIR with guidelines The components of an initial UWIR which are required to meet the requirements of the Water Act are described in Version 3.02 of the guideline document issued by DES (DES, 2017). Section 5 of the guideline describes specific components which are expected or required to be included in an initial UWIR. Table 1 summarises these requirements and provides a reference to the location in this report where the requirement is addressed.



Table 1: Compliance with UWIR requirements



2. Part A – Underground water extractions

2.1 Historical underground and open pit mining Historical underground mining at the Buck Reef Mine occurred from 1899 to 1917. The groundwater elevation occurs at around 17 mBGL and dewatering therefore would have been required to allow mining. However the inflows were not large enough to be recorded in historical documents and the mining operations were reported to have a shortage of water to use during processing.

The current Buck Reef pit and the underlying underground workings were mined from 1987 to 1993. Groundwater had recovered to around 17 mBGL prior to mining and some dewatering would have been required, as the Buck Reef pit extended to 50 mBGL and the underground workings extended to 300 mBGL. Groundwater inflows to the Buck Reef pit were reportedly low, and dewatering was not enough of a consideration for mining for any records to be maintained or any groundwater investigations to be completed.

The Buck Reef underground mine was described as a very dry mine during operation with no major groundwater inflows and only minor seepage occurring through some walls. Conditions in the underground workings were dry enough to require dust suppression as part of mining, with water for dust suppression sourced from the town supply and piped underground. A pumping station was maintained in shaft VS002_SAR to remove water from the underground, and water from the Buck Reef pit and all the underground mine reported to that shaft for removal. However, these flows were reported to largely comprise water pumped underground for mining use and no records of inflows or pumping rates were maintained.

2.2 Pit dewatering in 2019 Following the completion of underground mining in 1993 the existing Buck Reef pit and underground workings were allowed to flood. When the elevation of the lake in the Buck Reef pit was first surveyed in February 2014, it had recovered to 243 mAHD, which is consistent with the inferred pre-mining groundwater elevation, and equivalent to around 17 mBGL. The lake elevation remained with 1 m of this position from 2014 to 2019.

In September 2019, the lake in the existing Buck Reef pit was partially pumped out to facilitate groundwater quality improvement. The pumped flows were routed to the Processing Plant and utilised for mineral processing. The existing Buck Reef pit lies wholly within existing Mine Leases 1380 and 1532 which were issued prior to 2016. A cumulative flow meter was installed in the discharge line and recorded at weekly intervals. Instantaneous and cumulative rates for the taking of underground water in this period are plotted in Figure 3, and are described as follows:

• Pumping was undertaken with a 100 kW Southern Cross pump with an instantaneous pumping capacity of around 60 L/s.

• The pit lake was lowered from the equilibrium elevation of 243 mAHD on 4 October 2019, to the elevation of the pump intake (220 mAHD) on 7 November 2019.

• After the pump was switched off on 7 November 2019, the lake gradually rose, and the pump was operated for two short periods to lower the lake back to the pump intake.

• The cumulative take of underground water from 4 October 2019 to 21 February 2020 was 129,004 m3. The pump has been decommissioned and further take of underground water is not planned until mining commences.

• During the main pumping period, the average pumping rate ranged from 30 L/s to 60 L/s, with the variation related primarily to the proportion of time for which the pump was operating.

• The average pumping rate required to match groundwater inflows after pumping the lake down was in the range 0.5 L/s to 4 L/s.



• From 7 November 2019 to 10 January 2020 the pump was operated episodically to hold the lake at the pump intake at 220 mAHD. The underground water take in this period was 721 m3, which equates to an average pumping rate in that period of 0.9 L/s. There was only 2 mm of rainfall recorded in this period, and the average pumping rate can therefore be considered representative of the groundwater inflow rate.

• The volume of underground water taken from during the main dewatering period from 4 October 2019 to 7 November 2019 comprised water sourced from:

► The volume of water stored in the Buck Reef pit. ► The volume of water stored in the underground workings connected to the Buck Reef pit over

that elevation interval. ► Groundwater entering the pit and underground workings in response to the lake elevation

being lowered. ► Direct precipitation and runoff.

• There was only 2 mm of precipitation at Ravenswood from 4 October 2019 to 7 November 2019. Precipitation and runoff therefore did not contribute to the volume pumped. Based on the design shape for the Buck Reef pit, the volume of water stored in the pit between 220 mAHD and 243 mAHD was 147,000 m3. This is more than the total volume of 123,959 m3 pumped in that period, which implies that:

► The volume of water stored in the underground workings connected to the pit is small. ► The rate of groundwater inflow to the pit and underground workings is small compared to the

pumping rate. ► The actual storage volume in the Buck Reef pit is less than in the design pit shape due to

slumping of the pit slopes.

2.3 Estimated pit dewatering to 2024 The advance rate for the base of the BRW pit during mining is described in Section 1, and groundwater elevations will be maintained 10 m below the base of the pit where possible to maintain dry conditions in blast holes and grade control holes, resulting in the expected groundwater elevations in Table 2. Note that the start date for mining at the BRW pit has not been confirmed, and while the data for months after commencement of mining in Table 2 are expected to be accurate the actual dates may vary.

The expected groundwater inflow to the BRW pit for a range of groundwater elevations has been estimated using analytical techniques as described in Section 4. The resulting inflow rates are plotted in Figure 4 and have been reproduced from modelling work undertaken in 2017 (SLR, 2017). As described in Section 4 the modelling of inflow rates adopts conservative parameters and provides an upper estimate for the amount of underground water to be taken. The conservative nature of the model is confirmed by the observed groundwater inflow rate with the lake at 220 mAHD (0.9 L/s as described above) compared to the modelled rate of 0.15 ML/day (1.7 L/s) at that elevation.

Table 2 calculates the volume of underground water to be taken in each mining period, by applying the modelled median inflow rate at the lowest groundwater elevation in each period. The total amount of groundwater taken during the 51 months of mining is estimated to be 1,274,900 m3. The average inflow rate during the 51 months of mining is estimated to be 9.5 L/s. The total amount of groundwater taken during the first 36 months of mining (the period covered by the initial UWIR) is estimated to be 730,000 m3. Due to the conservative nature of the model these should be considered upper estimates.



Table 2: Estimated take of underground water

2.4 Long term water and tailings storage Once mining is completed, it is planned that the BRW pit will eventually be employed for tailings storage. During the tailings deposition period the pit will be pumped, but the volume of water pumped out will be less than the volume of water pumped in with the tailings, and the pumping will reflect the recycling of process water, not the taking of underground water.

Once tailings deposition is complete a lake will be maintained over the tailings so that they remain saturated. Water balance modelling has confirmed that the runoff inputs to the pit can be managed so that in long term closure 1) there will be no requirement to pump from the lake, and 2) the lake will remain below the local groundwater elevation (predicted median lake elevation 224 mAHD compared to the groundwater elevation of 243 mAHD) and the pit will continue to act as a groundwater sink (SRK, 2018). Although there will be no pumping in this period, evaporation will occur from the lake surface, and will match the combined inputs from groundwater inflow, direct precipitation and runoff. The observed and modelled groundwater inflow rates at the predicted median lake elevation of 224 mAHD are 0.9 L/s and 1.7 L/s respectively, and an upper estimate for the groundwater inflow being removed by evaporation is 1.7 L/s. During long term closure there will therefore be an ongoing underground water take estimated to be a maximum of 54,750 m3/year.

Months from Commencement

of MiningApproximate

DateBase of Pit

(mAHD)

Groundwater Elevation (mAHD)

Peak Inflow (ML/d)

Peak Inflow (L/s)

Volume (m3)

Cumulative volume (m3)

0 Jun-201 Jul-20 250 240 0.1 1

13 Jul-21 180 170 0.5 6 183,000 183,000 20 Feb-22 180 170 0.5 6 106,750 289,750 32 Feb-23 110 100 0.9 10 329,400 619,150 40 Oct-23 110 100 0.9 10 219,600 838,750 51 Sep-24 0 -10 1.3 15 436,150 1,274,900



3. Part B – Aquifer information and underground water flow

3.1 Background and geology There have been numerous groundwater investigation and monitoring programs undertaken near the Buck Reef Mine as described in Section 1. Around 190 active monitoring bores and 60 decommissioned bores have provided data for input to the current study. Construction details for these bores, including all of the bores marked in Figure 1, are provided in Appendix A.

Site geology typically comprises a surface thin layer (around 2 m) of highly weathered tonalite which has been weathered to a sandy texture (deco), overlying partially weathered tonalite (saprolite) which extends to around 12 mBGL (the top of fresh rock or TOFR). Below the TOFR, the upper surface of the tonalite typically has a fractured skin, with the degree and openness of fracturing reducing with depth. The fractured skin typically extends only a few metres into the tonalite, and at depth below the TOFR, the deep unweathered tonalite has been found to be typically unfractured and to have a low potential for groundwater transmission. The geological and structural investigations undertaken during the mining period have identified three significant faults at the Buck Reef Mine, being the Buck Reef Fault, The Jessop’s Creek Fault, and the Mill Fault as marked in Figure 2. Although these faults extend into the deep unweathered tonalite, in locations where they have been intersected during mining or exploration drilling, the fault zones have been found to be healed or to contain alteration rock flour products within the brecciated zone, with no open fracturing present. Where exposed in the wall of the Sarsfield/Nolans pit the Buck Reef Fault is around 2.5 m wide and the fault breccia has been infilled with calcite and silica and filled with alteration products. The geological units relevant to groundwater flow at the Buck Reef Mine are therefore classified as fractured rocks and are allocated to the “Ravenswood Granites and Volcanics” in the draft assessment of groundwater chemistry guidelines (DES, 2018).

3.2 Drilling and monitoring observations All of the monitoring bores at and surrounding the Buck Reef Mine were drilled by Rotary Air Blast (RAB) techniques. Observations of water returns to surface during drilling therefore provide a valuable indication of the depth zones where most groundwater transmission is occurring and are tabulated in Appendix B. It has been noted from the 121 bores for which drilling observations are available that:

• Inflows reported during drilling ranged from dry at some locations, to 9 L/s at a location to the east of the Buck Reef Mine near Sandy Creek and averaged 0.8 L/s over all 121 bores.

• The depth of the main groundwater inflow zone was available from 119 bores, and ranged from 3 m to 24 m with an average of 12 m.

• Depth to top of fresh rock ranged from 2 m to 29 m and averaged 12.5 m. • Comparing the depth of the main groundwater inflow zone against the top of fresh rock (TOFR) in

each bore identifies that: ► On average, the main groundwater inflow zone was 1.6 m into the skin of fracturing below the

TOFR. ► In 80% of the bores, the main groundwater inflow zone was within 9 m above or below the

TOFR and in 60% of the bores the main groundwater inflow zone was within 4 m above or below the TOFR.



These observations suggest that the horizons with the greatest hydraulic conductivity, and hence the greatest potential for the horizontal transmission of groundwater towards the dewatered pits, occur typically at around 14 m depth. The preferential groundwater transmitting paths at this depth comprises either weathered tonalite, or the skin of fractured tonalite immediately below the TOFR, or in most cases a combination of these units.

Many of the monitoring bores installed at and surrounding the Buck Reef Mine have been constructed as paired bores, with one bore intended to be screened in the very shallow weathered tonalite, and one bore intended to be screened in the skin of fracturing below the TOFR. A review of monitoring data from 31 locations in which paired or grouped bores have been installed identified that:

• In locations where the bores are screened just above and just below the TOFR, the groundwater elevation is identical between the paired bores, suggesting very small vertical gradients and strong hydraulic connection.

• In several locations where one of the bores has been constructed with a screen up to 30 m deep below the TOFR, the bore is indicated to intersect very low permeability conditions, with the groundwater elevation being very slow to recover after drilling, or to recover after attempts to sample the bore, causing the groundwater elevation to be significantly different between the grouped bores.

• In one location, a bore screened below the TOFR but within the interpolated saturated zone has failed to develop a water level several months after drilling, confirming a very low hydraulic conductivity for unweathered and unfractured tonalite.

These observations confirm that groundwater naturally flows between the weathered tonalite above the TOFR and the skin of fracturing present immediately below the TOFR, and these geological horizons in combination act as the main groundwater transmitting zone. They also identify that in most locations, the unweathered tonalite more than a few metres below the TOFR is unfractured and has low potential to transmit groundwater.

3.3 Groundwater elevations and flow directions There are generally no clay layers near surface at the Buck Reef Mine and recharge to the groundwater system occurs as direct infiltration from surface or from the intermittent surface water streams. Groundwater elevations and groundwater chemistry at and surrounding the Buck Reef Mine are strongly influenced by both seasonal and long term precipitation conditions.

The average annual precipitation at the Buck Reef Mine is around 640 mm, based on local records using data from 1990. A multi-year cycle has been observed in precipitation conditions in recent years, with below average precipitation being received from 1991 to 1996, in the period 2001 to 2006, and the period 2013 to 2016. Higher than average precipitation was received in the periods 1998 to 2000 and 2007 to 2012. From 2017 conditions returned to being close to average.



Groundwater monitoring data in the Carpentaria Gold database commence around the year 2000. Groundwater depth monitoring data are available in the Department of Natural Resources Mines and Energy (DNMRE) database from 1984 to 1990 from seven registered bores in the region of the Buck Reef Mine (RN85705 to RN85711 as marked in Figure 2). These data have been plotted as groundwater depth (mBGL) during previous investigations (SLR, 2017) and are reproduced in Figure 5. Based on the name and location of RN85705 it is almost certainly connected to the historical underground workings in the Sunset Mine, which was a historical underground mine below the modern Buck Reef pit. The other bores included in the plot appear to be shallow water supply bores between the Buck Reef Mine and the Ravenswood township. The groundwater depths reproduced in Figure 5 identify that:

• RN85705 responded strongly to open pit and underground mining at Buck Reef from 1989 to 1990, with groundwater being lowered from 10 mBGL to 35 mBGL. This confirms the bore intersects workings or fracturing in the deep tonalite.

• The other registered bores displayed no response to mining, with groundwater remaining between 5 mBGL and 10 mBGL during the mining period.

• All of the bores display background seasonal changes in groundwater depths of around 2 m in response to recharge from precipitation.

All of the current groundwater monitoring bores at and surrounding the Buck Reef Mine have been accurately surveyed allowing groundwater elevations to be calculated. The groundwater elevations have been plotted against monthly precipitation totals and against the elevations of the adjacent pit lakes in Figures 6 to 9. Observations from these detailed data are:

• Seasonal recharge events are evident based on changes in groundwater elevation of around 2 m which can be correlated with elevated monthly precipitation totals. Larger recharge events occur in some bores and are interpreted as follows:

► OB072_NOL (Figure 6) is drilled to around 100 mBGL near the Sarsfield/Nolans pit and the annulus has not been sealed. The large changes in groundwater elevation between wet and dry conditions potentially reflect the dewatering of the main shallow groundwater transmitting zone into fractures in the fresh tonalite at depth.

► A large recharge response occurred in March 2019 at OB108_NOL, OB087_SAR and OB114_SAR. All of these bores encountered low hydraulic conductivity conditions and were dry during drilling. The low hydraulic conductivity in these locations causes unusually large rises in groundwater elevation during recharge and causes the recharge responses to be slow to dissipate.

► OB059_SAR (Figure 7) is at the toe of the Buck Reef WRSF and is subject to recharge from seepage at the base of the facility, which causes rises of up to 8 m in groundwater elevation following recharge events.

• Groundwater elevations around the Sarsfield/Nolans pit have been around 60 m higher than the pit lake elevation since 2006, confirming that this pit (which encounters the same geology as the proposed BRW pit) acts as a groundwater sink. An exception is noted for PZ2_SAR which was drilled into the saturated tailings within the pit as marked in Figure 1, and therefore has a groundwater elevation equivalent to the pit lake elevation.

• Prior to September 2019, groundwater elevations near the Buck Reef pit were similar to the elevation of the pit lake.

• Vent shafts VS001_SAR and VS002_SAR have identical groundwater elevations to the Buck Reef pit lake and confirm the pit and underground workings are connected at depth.



• Responses to the dewatering of the Buck Reef pit in 2019 are plotted in more detail in Figure 9. The pit lake elevation was lowered by 23 m, and VS002_SAR and VS002_SAR responded immediately by the same amount, confirming direct connection is present. All of the other monitoring bores around the Buck Reef pit display groundwater elevations from September 2019 to March 2020 which are consistent with the range of previous variations, and no responses to dewatering are evident.

Groundwater elevations measured in all monitoring bores are contoured in Figure 10. The year 2018 was selected for contouring, which provides the most comprehensive dataset, as at that time all monitoring bores were being measured by Carpentaria Gold, and it allows groundwater depths collected from bores in the Ravenswood township to be included as a control on the contours. The contours define groundwater flow to generally be parallel to the surface water drainage system, with groundwater flow at the Buck Reef Mine being towards Elphinstone Creek and then parallel to the creek. 2018 was a year of average precipitation, which followed several years of below average precipitation. Figures 6 to 9 illustrate that in 2018 groundwater elevations were correspondingly at the lower end of the observed range in groundwater elevations. The close spaced contours and resulting groundwater flow arrows in Figure 10 identify that the Sarsfield/Nolans pit acts as a local hydraulic sink, and within approximately 200 m to the west of the pit rim, groundwater flow is to the east, towards the pit. Some of the historical mining area near the Ravenswood township is indicated from the contours to be hydraulically upgradient of the Buck Reef operations and may influence groundwater chemistry in the planned mining area. In 2018 the groundwater elevations near the Buck Reef pit were generally consistent with the greater region but demonstrated a flat groundwater surface. This is consistent with the conclusion that in 2018 the Buck Reef pit acted as either a flow through groundwater lake, or potentially as a local sink in some dry season conditions. The pit did not act as a continuous groundwater sink as the lake area in the base of the pit (11,000 m2 when at the equilibrium elevation of 243 mAHD) was small and losses through evaporation were correspondingly low (around 0.6 L/s on average). The much larger lake area planned for the BRW pit during and following tailings storage (260,000 m2) will reverse this balance, as outflows will exceed inflows (average evaporation will be around 15 L/s), and the planned BRW pit will act as a permanent groundwater sink.

3.4 Groundwater discharge In the absence of seepage and recovery pumping (which is undertaken in other locations at the Ravenswood Gold Mine but is not currently instituted at the Buck Reef Mine), and in the absence of mine dewatering, the combination of groundwater throughflow into the receiving groundwater environment and discharge from the groundwater system into the surface water system are the means of removal of groundwater from the groundwater system within the weathered and fractured tonalite at the Buck Reef Mine. Discharge to surface can only occur in locations where:

1. The groundwater elevation is at or above the base of the stream. 2. There is a vertical pathway for migration of groundwater through the near surface materials into the

stream sediments or to the streambed.



As there are no confining clay layers present, migration pathways occur in most locations, and the potential for groundwater discharge is largely controlled by the groundwater elevation compared to the surface elevation (i.e. the depth of groundwater below the local surface). Figure 11 contours the inferred depth of groundwater below surface in 2018. The interpolation has been generated by subtracting the groundwater elevation surface contoured in Figure 10 from the current topographic surface as measured from LIDAR surveys. Near the Buck Reef Mine, groundwater is contoured to be at surface at the Suhrs Creek Dam and in portions of Suhrs Creek, and groundwater is within 3 m of surface in parts of Elphinstone Creek downgradient of Suhrs Creek. Taking account that groundwater elevations were relatively low in 2018, all of these areas (red, yellow and green zones in Figure 11) could potentially be locations of groundwater discharge in some seasonal conditions.

3.5 Summary of hydrogeological model The hydrogeology of the Buck Reef Mine is well understood from the data available from the 130 monitoring bores that were present in 2017, data collected during the installation of an additional 60 bores in 2017 and 2018, and from the detailed monitoring and interpretation undertaken from 2017 to 2019. Deep geological conditions at the Buck Reef pit and the Sarsfield/Nolans pit are illustrated by the cross section in Figure 12, which follows the section line drawn in Figure 2. Figure 12 illustrates that the BRW pit is planned to be mined approximately 250 m into unweathered unfractured tonalite. Groundwater transmission occurs close to the TOFR, which is present at between 10 mBGL and 15 mBGL. This main groundwater transmission zone includes the weathered tonalite above the TOFR and the skin of fracturing below the TOFR and is referred to in this report as the TOFR aquifer. The TOFR aquifer typically occurs between 5 mBGL and 20 mBGL. Limited groundwater flow may occur in the deep tonalite, largely controlled by the presence of underground workings, or potentially by localised zones of fracturing. Regionally extensive zones of fracturing in the deep unweathered tonalite have not been identified during exploration and mining. This is confirmed by the lack of hydraulic connection between the Sarsfield/Nolans pit and the Buck Reef pit illustrated in Figure 12, despite the presence of the Buck Reef Fault. Figure 13 presents the section in Figure 12 at an expanded vertical scale to illustrate the groundwater transmission zones associated with the TOFR aquifer. As illustrated by the groundwater inflow zones marked on the monitoring bores, groundwater flow occurs at relatively low rates within the tonalite and close to the TOFR. The flow rate of 5.5 L/s reported by the driller for OB115_SAR is considered erroneous as this bore is pumped dry during sampling. The groundwater elevations and pit lake elevations in 2018 and the resulting flow direction arrows confirm that the Sarsfield/Nolans pit acts as a groundwater sink, and that groundwater flows from the Buck Reef pit towards Elphinstone Creek, where the groundwater elevation approaches the base of the stream and groundwater discharge occurs on a seasonal basis. Near the Sarsfield/Nolans pit and the Buck Reef pit the TOFR is unsaturated, due to the locally elevated topography and the dewatering influences. At depth in the unweathered tonalite there is limited fracturing and limited groundwater flow. Near the Buck Reef pit groundwater flow at depth is largely controlled by the presence of the underground workings, and any further connection to historical unmapped underground workings. Figures 2 and 13 illustrate that the mapped underground extent of the known current era workings is within the footprint of the planned BRW pit.



4. Part C – Predicted water level declines for affected aquifers

4.1 Interactions between the planned BRW pit and the aquifers Figure 13 identifies that at the locations where section BRW1 intersects the BRW pit the TOFR aquifer is mostly unsaturated. Conditions in the TOFR aquifer in the remainder of the BRW pit have been examined in Figure 14. This Figure presents a circular hydrogeological cross section constructed around the full perimeter of the pit, following the location where the planned BRW pit slopes cut the TOFR. Information presented on the section includes:

1. The ground surface which has been defined from an accurate LIDAR survey of the current topography.

2. The TOFR at the pit perimeter which has been calculated by contouring TOFR intersections in a large number of resource exploration holes drilled by Carpentaria Gold in the area of the pit.

3. The groundwater elevation at the pit perimeter in 2018, interpolated from the surface in Figure 10. 4. The 2018 elevation of the pit lake in the Buck Reef pit. 5. The lowest measured seasonal groundwater elevation at OB088_SAR located to the west of the pit

and at OB114_SAR located to the east of the pit.

The cross section around the BRW pit confirms that the TOFR aquifer is potentially largely unsaturated in the south and east, but potentially saturated in the north and west which will result in groundwater inflows to the pit during mining.

Figures 12 and 13 identify that dewatering from the base of the BRW pit during the planned mining will:

• Remove groundwater stored in the existing Buck Reef pit and underground workings in the deep tonalite, including water stored in vent shafts VS001_SAR and VS002_SAR.

• Induce groundwater flow towards the pit from any localised fracturing in the deep tonalite which is connected to the pit or underground workings.

• Induce groundwater flow into the pit from any saturated zones in the TOFR aquifer. • Cause the TOFR aquifer to be underdrained by the dewatering of the deep tonalite where vertical

pathways are present. These pathways potentially include zones of fracturing, ungrouted exploration drillholes and open or backfilled underground workings.

• In combination, these processes will act to lower the groundwater elevations in the TOFR aquifer near the BRW pit.

4.2 Bore census Bores which are present near the Buck Reef Mine, and which could potentially be affected by dewatering of the BRW pit have been investigated. As the BRW pit will act as a groundwater sink during mining, during temporary water storage and during long term tailings storage there will be no influence of the BRW pit on groundwater chemistry at the bores. However as described in Section 4.1 the interactions between the pit and the TOFR aquifer may result in a lowering of groundwater elevations at some bores.



The presence of any registered bores located within a 2 km radius of the BRW pit has been examined using the DNMRE database of registered bores, accessed via Queensland Globe, and the results of the search are reproduced in Figure 15. The results of further investigation and field location of the bores in Figure 15 are summarised in Table 3. Of the 26 registered bores identified to be present within 2 km of the base of the BRW pit:

• 19 are monitoring bores which have been installed by Carpentaria Gold for groundwater monitoring, are not used for water supply, and will not be compromised by lowering of groundwater elevations.

• 4 could not be located in the field and appear to no longer exist. • One bore (RN85710) was thought to have been located in previous studies (SLR, 2017), however the

DNRME records describe the bore as having 155 mm PVC casing at surface, and being 30 m deep, whereas the located bore is a brick lined well, which is 9.3 m deep and so in fact the registered bore appears to no longer exist.

• Two bores (RN85707 known as Rail_Hot_1 and RN85709 known as Imp_Hot_1) are thought to have been located, to intersect the TOFR aquifer but are not currently used for water supply.

Table 3: Registered bores within 2 km of BRW pit

Registered Number Name Reported Depth Plumbed DepthInferred

Formation Investigation results/usemBGL mBGL

85705 SUNSET_NO2 NA Deep tonalite.Overlies Sunset workings, no

longer present85706 BILLS_BORE NA TOFR aquifer Could not be located in field.

85707 RAIL_HOT_01 NA 9.15 TOFR aquifer

Location approximately 1km from DNRME co-ordinates, riser present,

not in use85708 ANNING NA TOFR aquifer Could not be located in field.85709 IMP_HOT_01 NA TOFR aquifer No pump installed, not in use.85710 SCHOOL_01 ?? 30 9.3 TOFR aquifer Brick lined hand dug well, dry.85711 MANAGERS NA TOFR aquifer Could not be located in field.140565 OB059_SAR 18 TOFR aquifer CG monitoring bore.171932 OB101_SAR 37 TOFR aquifer CG monitoring bore.175475 OB102_SAR 37 TOFR aquifer CG monitoring bore.175486 OB116_NOL 50 Deep tonalite. CG monitoring bore.175487 OB115_NOL 13 TOFR aquifer CG monitoring bore.175488 OB114_NOL 50 Deep tonalite. CG monitoring bore.175489 OB113_NOL 15 TOFR aquifer CG monitoring bore.175496 OB125_NOL 19 TOFR aquifer CG monitoring bore.175503 OB071A_NOL 100 Deep tonalite. CG monitoring bore.183163 OB116_SAR 24 TOFR aquifer CG monitoring bore.183159 OB119_SAR 26 TOFR aquifer CG monitoring bore.

183160 OB114_SAR 24 TOFR aquiferCG monitoring bore, in DNRME

database with wrong coordinates.183161 OB117_SAR 27 TOFR aquifer CG monitoring bore.183162 OB113_SAR 25 TOFR aquifer CG monitoring bore.183165 OB112_SAR 25 TOFR aquifer CG monitoring bore.


database with wrong coordinates.


database with wrong coordinates.183169 OB118_SAR 25 TOFR aquifer CG monitoring bore.183170 OB115_SAR 17 TOFR aquifer CG monitoring bore.



Further to the search of the DNRME database in Figure 15, the investigations completed in 2017 included a field investigation to identify all bores being used for garden irrigation in the area of the Buck Reef Mine, regardless of registration (SLR, 2017), and the results of the investigation are summarised in Figure 16 and in Table 4. 28 bores were located, of which 14 were found to be in use and the remainder were found to be inactive. Two of the inactive bores potentially relate to registered bores, while one active bore (Pratchet_01) appears to have a registered number. The other 25 bores do not appear to be included in the DNRME database of registered bores. A Bore Baseline Assessment form was compiled for each of the identified bores providing more detail on the construction and operation of each one (SLR, 2017).



Table 4: Results of bore census

Bore IDDate of

assessmentPossible

RN Easting Northing

Depth to water 2017

Plumbed depth

In service

Inferred formation Comment

mBGL mBGLIMP_HOT_02 23-May-17 488499 7777447 3.78 10.1 Yes TOFR aquifer. In corner of hotel yard. Pump installed.POOL_01 23-May-17 488874 7777839 3.68 - Yes TOFR aquifer. Used for irrigation of lawns, bore inside garden shed.GRIFFIN_01 23-May-17 489042 7777780 3 11.3 Yes TOFR aquifer. Used for irrigation of domestic garden.

ELLIOT_01 23-May-17 488687 7777144 - Yes TOFR aquifer.Unable measure water level due to bore headworks, sampled using installed

pump.PARK_01 23-May-17 488419 7777402 3.7 7.67 Yes TOFR aquifer. Installed with pump and in regular use.67_RAVEN_01 24-May-17 488802 7778050 6.63 10.33 Yes TOFR aquifer. Used for irrigation of domestic garden.

PRATCHET_01 24-May-17 125170 486680 7775960 5.16 - Yes TOFR aquifer.Solar powered electric submersible installed. Understood to be used for

stock watering.

61_RAVEN_01 20-Jun-17 488749 7778037 Yes TOFR aquifer.No access to measure water level. Bore pumps to tank. Located in the front

yard. There was another old unused bore on the property.53_RAVEN_01 20-Jun-17 488692 7777959 Yes TOFR aquifer. No access to measure water level, bore water used to water garden.66_RAVEN_01 20-Jun-17 488866 7778029 4.94 9.17 Yes TOFR aquifer. Installed in 1978. Has never run dry.68_RAVEN_01 20-Jun-17 488886 7778033 5 9 Yes TOFR aquifer. Installed in 1978. Has never run dry.

109_DEIGHTON_01 22-Jun-17 489012 7777868 7.2 10 Yes TOFR aquifer.Used semi-regularly for garden. Large diameter well. Submersible pump.

May be bore RN85708 ANNING.69_RAVEN_01 22-Jun-17 488805 7778084 4 10 Yes TOFR aquifer. Not used regularly. Pump plays up. Had to be primed to start.55_MONTAGNE_01 22-Jun-17 486962 7776620 2.45 2.9 Yes TOFR aquifer. Cement casing dug into creek bed. Pumped during daylight hrs with solar.

RAIL_HOT_01 20-Jun-17 85707 488220 7777520 4.47 9.15 No TOFR aquifer. Location approximately 1km from GWDB co-ordinates, riser present, not inIMP_HOT_01 23-May-17 85709 488523 7777455 3.33 - No TOFR aquifer. No pump installed, not in use.SCHOOL_01 23-May-17 488647 7776985 Dry 9.3 No TOFR aquifer. Brick lined hand dug well.SHOWGRD_01 23-May-17 488711 7777698 3.1 5.58 No TOFR aquifer. Windmill on hand dug well, not in useLOOP_01 23-May-17 488650 7776918 Dry 12.55 No TOFR aquifer. Pump and riser present, not in use.TOWN_WINDMILL_01 23-May-17 488253 7777581 - No TOFR aquifer. No access to measure water level. Circa 1910. Approx. 1.5 m diameter.AINSWORTH_01 24-May-17 489097 7777674 4.07 6.7 No TOFR aquifer. Brick lined hand dug well with steel windmill.HOLLYOAK_01 24-May-17 488759 7777214 - No TOFR aquifer. 100mm PVC casing. Bore blocked at 1.8mbgl.23_JOHN_01 24-May-17 488790 7777286 dry 13.6 No TOFR aquifer. Concrete cased 1m diameter well.16_ELLIOT 24-May-17 488637 7777297 6.63 7.09 No TOFR aquifer. 1m diameter well with windmill.92_DEIGHTON_01 20-Jun-17 488903 7777681 Dry 7.15 No TOFR aquifer. Cement cap on well. Old windmill with no pump. Well was dry.PO_WINDMILL_01 20-Jun-17 488446 7777496 No TOFR aquifer. Steel lid was glued onto top of well casing. Large diameter well.72_RAVEN_01 22-Jun-17 488911 7778060 4.8 9.8 No TOFR aquifer. Installed in 1978. Not used. Borehole inside small tin shed.28_RAVEN 488589 7777631 Unknown TOFR aquifer. Could not contact owner for access.



4.3 Modelling of the affected area during mining Drawdown due to dewatering of the BRW pit will initially be driven by the groundwater elevation which is maintained below the pit during mining. Table 2 indicates that the groundwater elevation will be lowered from 240 mAHD to 100 mAHD within three years of commencing mining and will then be lowered to -10 mAHD in the next 15 months. The upper active groundwater transmitting system will be fully dewatered within much less than three years, and the subsequent dewatering will occur within deep low hydraulic conductivity tonalite. The Immediately Affected Areas (IAA, the area where drawdown is predicted to occur in the three year period covered by the initial UWIR), is therefore very similar to the Long Term Affected Areas (LTAA, the area where drawdown is predicted to occur over the mine life). Modelling of the potential drawdown has therefore been undertaken for the end of the mine life (51 months of mining) to define the LTAA, and the IAA is assumed to have the same extent as the LTAA.

Modelling of the LTAA was undertaken during permitting studies for the BRW pit (SLR, 2017). The modelling was undertaken using:

1. A pit inflow analytical model based on equations developed by Marinelli and Niccoli as schematically illustrated in Figure 17 (Marinelli and Niccoli, 2000). This analytical approach is considered by BDH to be appropriate for the purpose of predicting drawdown during mining, as it allows the simulation of two layers with differing hydraulic properties as occurs at the BRW pit, and it does not require the construction of a full 3D groundwater model. There are insufficient measurements of hydraulic properties in locations around the BRW pit to quantify the variation in hydraulic properties for input to a 3D model. However, it is noted the predictions from the analytical model include only drawdown from pit dewatering, do not predict changes in streamflow at Elphinstone Creek, and do not include interference effects from other mine facilities, such as drawdown associated with mining in the Sarsfield/Nolans pit.

2. A 2 D section model constructed along Section A as marked in Figure 16. The model was constructed in the SeepW modelling package and the grids applied to base case conditions and mining conditions are illustrated in Figure 18. Advantages of SeepW model A are that the influences of seepage from the planned BRW WRSF can be accounted for, and changes in conditions at Elphinstone Creek can be predicted.

3. A 2 D section model constructed along Section B as marked in Figure 16. The model was constructed in the SeepW modelling package and the grids applied to base case conditions and mining conditions are illustrated in Figure 19. Advantages of SeepW model B are that the influence of concurrent dewatering at the Sarsfield/Nolans pit can be accounted for, and changes in conditions at Elphinstone Creek can be predicted.

Parameters applied to the modelling undertaken by SLR in 2017 are summarised in Table 5. A review by BDH of these parameters and the modelling approaches, taking account of the interpretation of additional data collected from 2017 to 2019 has identified that:

• The model geometries and model layer thicknesses are consistent with the interpolation of updated drilling results from the area of the Buck Reef Mine.

• The final pit shape applied in the models was consistent with the BRW pit as currently planned. • Although the models do not account for the influence of the known extent of the existing underground

workings, these workings fall almost entirely within the planned BRW pit (see Figures 2 and 13 for the underground extent) and are therefore effectively accounted for in the simulation of the pit void.



• The hydraulic parameters applied during modelling are consistent with the range of values derived from various investigations and with the observations during drilling and monitoring at the Buck Reef Mine from 2017 to 2019.

• The calibration of the models to the observed groundwater inflows to the pits and to the observed groundwater elevations in the monitoring bores was reasonable but was also conservative, as it tended to overestimate inflows compared to those observed during pumping at the end of 2019.

• The predictions of dewatering influences provided in the modelling investigations are therefore valid for the definition of the IAA and LTAA for the initial UWIR. However the models are considered to potentially over-predict groundwater inflows to the BRW pit and to provide an upper estimate of the extents of the IAA and LTAA. Modelling of dewatering influences will be refined once data are available to define the actual drawdown responses during mining which can be used to recalibrate/update or replace the models.

Table 5: Parameters assumed during modelling

Notes: % MAP recharge rate as a percentage of mean annual precipitation

kh horizontal hydraulic conductivity

kv vertical hydraulic conductivity

The Water Act requires the IAA and LTAA to be defined as the zone where a groundwater drawdown greater than the bore trigger threshold is predicted. The bore trigger threshold is defined to be 5 m in a consolidated aquifer and 2 m in an unconsolidated aquifer. A bore trigger threshold of 2 m has been adopted for the definition of the IAA and LTAA at the BRW pit as:

1. The TOFR aquifer includes a portion of relatively unconsolidated sediments and unconsolidated tonalite weathering products in the upper portion which are saturated in some locations.

2. The background seasonal variation in groundwater elevations has been identified to be around 2 m, so a drawdown of 2 m or more would be required to discerned from the background variation.

Parameter Unit ValueRecharge to regolith % MAP 1.5Recharge to WRSF % MAP 5kh in regolith (upper TOFR aquifer) m/d 2kv in regolith (upper TOFR aquifer) m/d 0.2kh in fractured rock (lower TOFR aquifer) m/d 0.6kv in fractured rock (lower TOFR aquifer) m/d 0.012kh in host rock (deep tonalite) m/d 0.00000864kv in host rock (deep tonalite) m/d 0.00000864kh in waste rock m/d 5kv in waste rock m/d 0.5kh in bund wall m/d 0.00864kv in bund wall m/d 0.000864



The 2017 modelling investigations defined the zone within which a drawdown of 2 m or more was predicted to occur over the entire mine life using the results of the analytical model illustrated in Figure 17, validated by the more detailed transient SeepW models presented in Figures 18 and 19. The expected drawdown extent was defined using the parameters in Table 5. Taking account of the potential variation in these parameters a drawdown extent was calculated to account for 95% of all possible groundwater conditions, and a maximum possible drawdown extent was calculated (SLR, 2017). The 2017 modelling results are plotted in Figure 20, and these predictions are assessed by BDH as follows:

1. The modelled maximum drawdown extent is clearly overly conservative as a definition of the IAA. It predicts 2 m of drawdown extending into the Sarsfield/Nolans Pit. Given that long term dewatering of the Sarsfield/Nolans pit has caused no drawdown at the location of the Buck Reef pit, it is not possible for drawdown due to mining at the BRW pit to migrate through the same intervening hydrogeological units to reach the Sarsfield/Nolans pit.

2. The 95% confidence drawdown limit is also overly conservative as a definition of the IAA. Again it predicts 2 m of drawdown extending to the Sarsfield/Nolans pit which is not possible. It also predicts 2 m drawdown at the locations of RN87506 (Bills Bore) and RN85709 (Imp_Hot_01). Figure 5 illustrates that both these bores were monitored when the Buck Reef underground mine was dewatered to -30 mAHD from 1989 to 1993, and that no drawdown due to mining occurred.

3. The expected drawdown limit drawn in Figure 20 is considered an appropriate and conservative definition of the predicted 2 m drawdown limit and hence this line defines the margin of the IAA and the margin of the LTAA. The limit is defined to be conservative as it includes the locations of RN87510 (School_01) and RN85711 (Managers) which were monitored and did not respond during dewatering of the Buck Reef modern underground mine from 1989 to 1993. It also includes the locations of multiple modern monitoring bores which did not respond to pumping out the Buck Reef pit lake at the end of 2019. The extent of the IAA defined from the modelling results is also very consistent with the observed radius of influence of dewatering at the adjacent Sarsfield/Nolans pit, as defined in Figure 10. The Sarsfield/Nolans pit is mined through the same hydrogeological sequence (TOFR aquifer overlying deep tonalite) that will be encountered in the BRW pit.

For the purposes of the initial UWIR, the IAA is defined to be the zone labelled as the IAA in Figure 20, which reflects the expected area predicted during modelling by SLR which was used to support the issue of an EA to cover mining of the BRW pit (SLR, 2017). This estimate of the IAA may only be refined and improved once monitoring data have been collected during mining and dewatering of the BRW pit to define the regional and vertical variation in connectivity of the TOFR aquifer to the deep tonalite and underground workings present at the BRW pit which will be dewatered during mining. Section 6 describes that all of the monitoring and water supply bores in Figures 1 and 2 will be monitored during mining, and the drawdown responses in these bores will be reviewed annually to either confirm or update the definition of the IAA and LTAA presented in Figure 20.

4.4 Assessment of surface subsidence Figures 12 and 13 illustrate that nearly all of the dewatering which will be undertaken during mining in the BRW pit will occur in deep unweathered and largely unfractured tonalite. Tonalite is a crystalline igneous rock which has a massive texture and high strength. There is no confining layer above the tonalite, and the TOFR aquifer occurring in the shallow geology is unconfined, with the water table free to rise and fall according to the groundwater elevations. The TOFR aquifer forms a relatively thin skin at the top of the tonalite, extending to a maximum of 25 mBGL.



As a result of the geological and hydrogeological units present at the BRW pit, there is no potential for dewatering of the tonalite to cause damage to the structural integrity of the deep tonalite, or to cause damage or subsistence of the weathered zone overlying the tonalite. Subsidence during dewatering is not anticipated, and no monitoring of subsidence is proposed during mining.

4.5 Bores potentially in the affected area Figure 20 identifies that for the purposes of the initial UWIR, bores located within the IAA and LTAA comprise:

• Monitoring bores screened in the TOFR aquifer which have been installed by Carpentaria Gold to monitor drawdown influences during mining (OB085_SAR, OB086_SAR, OB114_SAR, OB083_SAR, OB084_SAR, OB118_SAR, OB110_SAR, OB093_SAR and OB094_SAR).

• Monitoring bores intersecting deep tonalite which are monitored by Carpentaria Gold to define drawdown influences during mining (VS001_SAR and VS002_SAR).

• Two bores constructed in the TOFR aquifer for water supply which are not currently in use, were both dry when checked in 2017, and do not appear to be registered (Loop_01 and School_01).

• One bore constructed for water supply which is no longer in use, is assumed to be screened in the TOFR aquifer, and which does not appear to be registered (Elliot_01).

Details of these bores, including tenure, are addressed separately in the Baseline Assessment Plan (AARC, 2020).

4.6 Springs and seeps potentially in the affected area The Buck Reef Mine experiences a strongly seasonal climate with a dry season occurring typically from April to November. Springs and seeps which may potentially be driven by groundwater discharge are easily identified as zones which remain wet during the extended period of low precipitation in the dry season. These zones are well understood at the Buck Reef Mine from surface water monitoring undertaken for compliance with the EA, and from surface water and environmental monitoring undertaken for the Receiving Environment Monitoring Program (referred to as the REMP, TropWater, 2018).

The mapping and monitoring undertaken by Carpentaria Gold identifies that within the IAA and LTAA defined in Figure 20, there are no springs or seeps present. There are minor surface water streams within the IAA and LTAA which drain surface runoff to the west towards Elphinstone Creek. All of these minor streams have been classified as highly ephemeral in the REMP and they flow only for short periods following significant precipitation events and dry up rapidly following the events. Figure 11 confirms that groundwater is more than 10 m deep within the IAA and there is no potential for groundwater to discharge at surface.

The closest location outside the IAA and LTAA where springs and seeps could potentially occur are within Elphinstone Creek to the north of the BRW pit. Detailed mapping and monitoring of this area are summarised in Figure 21. The portion of Elphinstone Creek below the confluence with Suhrs Creek typically sustains trickle flows through saturated stream bed sediments during the dry season”. While SW035_SAR and SW078_SAR have always held water, Elphinstone Creek has not always continued flowing downstream of SW035_SAR. Surface water monitoring in 2019 indicated groundwater expression at numerous locations along the reach of Elphinstone Creek between Suhrs Creek and One Mile Creek with maximum inputs inferred to be northwest of the Buck Reef pit. Historical records from Elphinstone Creek below Mabel Mill (i.e. north-northwest of the Buck Reef pit, see comments in Figure 21) suggest some degree of groundwater expression in this reach in most years.



Reviews of surface water hydrochemistry have identified that there is potential for groundwater springs or seeps to be a contribution to the trickle flows observed in the reach of Elphinstone Creek from SW078_SAR to One Mile Creek as annotated in Figure 21. Figure 11 confirms that there is potential for groundwater to approach surface in some periods in this reach of Elphinstone Creek, as groundwater was within 3 m of surface in 2018 when groundwater elevations were relatively low at SW078_SAR to the northeast of the Buck Reef pit and in Elphinstone Creek to the north-northwest of Buck Reef pit. Other potential contributions to the flows have been identified to be discharge from septic tanks, and seepage from the upgradient Suhrs Creek Dam.

Monitoring data for seepage rates from the Suhrs Creek Dam and seepage recovery rates were reviewed during BRW pit design studies (SLR, 2017). The data plotted in that study are reproduced in Figure 22 and identify that in the absence of seepage recovery below the Suhrs Creek Dam seepage contributes a baseflow of around 1,000 m3/day (12 L/s) into Elphinstone Creek downgradient, and is likely to be the dominant source of the trickle flows observed at SW078_SAR.

Although the potential springs and seeps in Elphinstone Creek at SW078_SAR and to the north-northwest of Buck Reef pit lie outside the IAA and LTAA, they will be monitored as described in Section 7 to ensure that any potential influences from BRW pit dewatering are identified.



5. Part D – Impacts on environmental values

5.1 Sources of data Environmental values for groundwater in the region of the BRW pit were reviewed in detail in the mine design studies (SLR, 2017), and environmental values for surface water in the region of the BRW pit are assessed every year as part of the REMP (TropWater, 2018). In each case these studies initially compiled the default values which apply to the greater region (the upper Burdekin River catchment), which were then modified to account for the specific local conditions in the groundwater and surface water systems near the BRW pit.

5.2 Environmental values Environmental values for groundwater in the TOFR aquifer near the BRW pit were identified to be:

• Abstraction of groundwater for stock watering. The bores used for this purpose which are closest to the BRW pit are 55_Montagne_01 and Pratchet_01, located more than 1.4 km to the southeast of the BRW pit, as indicated in Figure 20.

• Abstraction of groundwater for garden irrigation. Figure 20 identifies that there are several bores which have been used for occasional garden irrigation located to the northeast of the BRW pit. One of these bores (Elliot_01) is located within 480 m of the centre of the BRW pit and is located at the margin of the IAA, however this bore is no longer in use.

• Potentially contributing to the support of aquatic ecosystems in seepage zones within Elphinstone Creek to the north of the BRW pit, including the location of SW078_SAR, as described in Figure 21.

For the surface seepage and trickle flows in Elphinstone Creek which may be partially supported by groundwater discharge from the TOFR aquifer, a detailed assessment of conditions in the reach of Elphinstone Creek between the confluence with Suhrs Creek and the confluence with One Mile Creek (TropWater, 2018) has identified the site specific environmental values to be:

• Maintenance of aquatic ecosystems. • Stock and fauna watering. • Visual recreation. • Cultural, spiritual and ceremonial values.

5.3 Potential impacts Water balance modelling (SRK, 2018) has demonstrated that the BRW pit will act as a groundwater sink throughout the mining, tailings storage and long term closure phases. In long term closure this results from the large area of the lake above the tailings, which causes rates of evaporation to exceed the combined inflows from groundwater and runoff. There will be no impacts from dewatering the BRW pit associated with changes in groundwater chemistry in the TOFR aquifer. Monitoring of changes in groundwater chemistry due to the operation of the mine facilities will be undertaken as required by the EA and described in the GMP.

The only mechanism by which potential impacts on environmental values may occur due to mine dewatering is by lowering of groundwater elevations in the TOFR aquifer. The potential for drawdown associated with BRW pit dewatering to affect the identified environmental values for groundwater in the TOFR aquifer is assessed as follows:



• At any bore being used for stock watering, if drawdown due to mining causes the groundwater level in the bore to be lowered to or below the pump intake, the bore may not be able to be operated in its existing configuration. No impacts to the environmental value of stock watering are anticipated, as all of the existing bores used for stock watering are outside the IAA. The IAA has been defined as the zone inside which a drawdown of 2 m or more is predicted, which is appropriate for this environmental value, as the groundwater elevation rises and falls by around 2 m in response to natural seasonal recharge and so any existing bore should have been designed to cope with drawdowns up to 2 m.

• At any bore used for garden irrigation, if drawdown due to mining causes the groundwater level in the bore to be lowered to or below the pump intake, the bore may not be able to be operated in its existing configuration. All of the bores being used for this environmental value lie outside the IAA and are not anticipated to be affected, other than Elliot_01 which is no longer in use.

The potential for drawdown due to mining of the BRW pit to affect environmental values for surface water are assessed to have a low risk as follows:

• Groundwater is more than 10 m below surface in the IAA preventing the occurrence of springs or seeps in the IAA.

• The IAA does not extend to the location of Elphinstone Creek. • Groundwater discharged from the TOFR aquifer around and downgradient of SW078_SAR is

potentially one of the contributions to saturated bed conditions observed in Elphinstone Creek between Suhrs Creek and One Mile Creek. Any contribution from groundwater will vary seasonally, and groundwater discharge may not occur in drier periods.

• If drawdown due to mining at BRW pit extended beyond the modelled IAA as far as the reach of Elphinstone Creek north and northwest of the BRW pit, this could potentially cause the rate of groundwater discharge to reduce and hence dry season flows or saturation within the creek to reduce, and it could cause the creek to dry out for longer in the dry season due to the other sources of seepage being underdrained into the groundwater system. Mining related drawdown would have no effect on wet season flows in Elphinstone Creek as these are dominated by much higher rates of surface water runoff.

• Reduced dry season flow, or longer dry periods in the wet season, if large enough could potentially affect all of the surface water environmental values identified for Elphinstone Creek (support of aquatic ecosystems, stock and fauna watering, visual recreation, cultural, spiritual and ceremonial values). However these effects would be dependent on the magnitude of the mining related changes, in comparison to the natural background changes.

• No degree of impact would be expected to occur if groundwater drawdown at Elphinstone Creek reaches the spring trigger threshold of 0.2 m defined in the Water Act, as the natural background seasonal variation in groundwater elevations is an order of magnitude larger than that threshold.



• Transient (SeepW) modelling of BRW pit dewatering included simulation of the changes at Elphinstone Creek, by assuming the entire reach of the creek to be permanently saturated to an elevation of between 239.7 mAHD and 243.5 mAHD. The models identified that under the most conservative assumptions 1.6 km of Elphinstone Creek could be affected, and that the total rate of seepage from this portion of the creek into the TOFR aquifer driven by drawdown would be 0.02 ML/d to 0.03 ML/d (0.2 L/s to 0.3 L/s). This reduction in dry season flow would be small compared to the observed trickle flows, and would be small compared to the other inputs and there is identified to be a low risk that dewatering at BRW pit could impact on the surface water environmental values in Elphinstone Creek in the dry season.



6. Part E – Water monitoring strategy

6.1 Background The monitoring of groundwater and surface water at Buck Reef Mine which is required for compliance purposes is described in the EA which authorises mining of the BRW pit. Condition E52 of the EA required a Groundwater Management Program (GMP) to be documented and implemented by 4 February 2020, which was achieved. The GMP describes the groundwater monitoring which is being undertaken both to ensure compliance with the EA and to provide interpretation data with which to manage the TOFR aquifer, including the operation of seepage interception bores.

The GMP describes groundwater chemistry monitoring which will be undertaken near potential mine sources (operational bores), along the known groundwater flowpaths (interpretation bores), and in the groundwater receiving environment (compliance bores). The locations at which groundwater chemistry is required to be monitored near the Buck Reef Mine facilities include three compliance bores, one operational bore, and thirteen interpretation bores.

The GMP includes a description of groundwater monitoring being undertaken in the area of the Buck Reef Mine to monitor for and manage any impacts due to mining. The following sections describe a water monitoring strategy specifically for the dewatering of the BRW pit, which includes the monitoring in the GMP, and augments this monitoring to take account of the potential impacts quantified in the initial UWIR.

6.2 Rationale Water balance modelling has demonstrated that the BRW pit will act as a groundwater sink during mining, during tailings storage and during long term closure (SRK, 2018). In long term closure, this results from the large area of the lake above the tailings, causing rates of evaporation to be higher than the combined inputs from groundwater and runoff. The water monitoring strategy for BRW pit dewatering defined in the UWIR is therefore based on the monitoring of groundwater elevations and does not include the monitoring of groundwater quality.

However, as described in the GMP, there is potential for other Buck Reef Mine facilities such as the New Buck Reef WRSF to cause changes in groundwater chemistry, and the groundwater monitoring required in the EA and described in the GMP includes groundwater quality monitoring along the potential flowpaths in the TOFR aquifer downgradient of these facilities.

Groundwater elevation monitoring to specifically address dewatering of the BRW pit is planned to be undertaken:

• At monitoring bores within the IAA to confirm whether drawdown close to the BRW pit occurs at the magnitude predicted.

• At monitoring bores outside the IAA to provide early warning if the observed drawdown should extend further than the area modelled for the IAA.

• At monitoring bores located between the BRW pit and Elphinstone Creek. This monitoring will help to identify whether drawdown from BRW pit dewatering is a contribution to any observed change in seepage conditions in Elphinstone Creek.

6.3 Strategy The water monitoring strategy proposed to be applied for the mining of the BRW pit and during subsequent tailings storage is:



• Measuring groundwater depth in all of the monitoring bores identified with green labels in Figure 23 and listed in Table 6 every three months.

• Measuring groundwater depth in the monitoring bores identified with red labels in Figure 23 and listed in Table 6 every three months until they are decommissioned or become inaccessible due to mining.

• The completion details in Table 6 confirm nearly all of these bores are screened in the TOFR aquifer. However VS001_SAR and VS002_SAR near the Buck Reef pit and within the BRW pit measure groundwater depths in the deep tonalite.

• Groundwater depths will be collected in all bores within a 2 week period in each monitoring round to provide a comprehensive snapshot of the groundwater surface.

• All of the bores marked in Figure 23 have had their collars accurately surveyed, allowing groundwater depths to be converted to groundwater elevations for presentation.

• Most of the bores in Figure 23 are already being monitored at three month intervals. The groundwater elevations plotted in Figures 6 to 9 demonstrate that this frequency is sufficient to identify background seasonal trends and resolve them from dewatering influences.

• Surveying the elevation of the lake in the Buck Reef pit, the lake in the BRW pit and the lake in the Sarsfield/Nolans pit at monthly intervals when a lake is present. These elevations will be used to confirm that the pits continue to function as groundwater sinks as predicted.

• Measuring groundwater depths in the water supply bores marked in Figure 23 and listed in Table 6 at three monthly intervals, when access is available and when permission can be received from the owners. These measurements are intended to confirm that water supply bores screened in the TOFR aquifer outside the IAA are not experiencing drawdown greater than the background seasonal variation during BRW pit dewatering.

• Monitoring at the surface water monitoring sites illustrated in Figure 23, with monitoring following the methods described in the EA and the REMP. More detail of monitoring which will be undertaken in the potential seepage zone in Elphinstone Creek is provided in Section 7.

• Installing a cumulative flow meter on the pumping system transferring water from the BRW pit to the Processing Plant and recording the cumulative volume of water take on a weekly basis during pumping operations.

6.4 Timetable A schedule of the bores to be monitored specifically for the initial UWIR is provided in Table 6. Table 6 includes the inferred screened formation, the distance from the centre of the BRW pit, and the location with respect to the IAA in each case. These bores are a subset of the total number of bores required by the EA and the GMP to be monitored at the Ravenswood Gold Mine. Three monthly measurement of groundwater depths in most of the monitoring bores in Table 6 has been underway since August 2018 and will be continued at all bores from March 2020. Access to the water supply bores listed in Table 6 is currently being negotiated, and three monthly monitoring in the accessible bores will be implemented prior to the commencement of mining and dewatering in the BRW pit.

A schedule of the surface water monitoring sites, monitoring frequency and monitored analytes is provided in Tables E4 and E5 of the EA. A schedule of the surface monitoring sites which will be investigated in more detail is provided in the REMP (TropWater, 2018). More detail of the monitoring of the seepage environment in Elphinstone Creek is provided in Section 7.



Table 6: Monitoring bore schedule

Note: NA Not available

Bore Easting NorthingCasing

ElevationTop of Screen

Base of Screen

Logged Top of Fresh Rock

Interpreted Screened Formation

Distance from BRW

pit Tenure Location and RationalemAHD mBGL mBGL mBGL m

OB100_SAR 487969.7 7775689 256.153 18 30 11 TOFR aquifer 1202 ML10170 Outside IAA to southOB117_SAR 487993.7 7775877 259.167 21 27 7 TOFR aquifer 1015 ML 100172 Outside IAA to southOB087_SAR 487992.8 7776051 261.511 32 35 8.5 TOFR aquifer 852 ML100172 Outside IAA to southOB116_SAR 488135.7 7776130 262.758 18 24 13 TOFR aquifer 733 ML 100172 Outside IAA to southOB112_SAR 487458 7775990 247.213 18 25 15 TOFR aquifer 1204 EPM 15099 Outside IAA to westOB111_SAR 487450 7776468 254.003 19 25 11 TOFR aquifer 937 EPM 15099 Outside IAA to westOB088_SAR 487883.7 7776554 245.102 15 18.4 3 TOFR aquifer 513 EPM 15099 Outside IAA to westOB059_SAR 487937.8 7776595 248.622 0.01 18 NA TOFR aquifer 446 ML 100172 Outside IAA to westOB030_RC 487694.1 7776668 243.533 NA NA NA TOFR aquifer 639 EPM 15099 Outside IAA to westOB115_SAR 487737 7776711 244.23 9 17 10 TOFR aquifer 587 EPM 15099 Outside IAA to westOB089_SAR 487624.4 7776814 241.537 5 8.3 8.3 TOFR aquifer 685 EPM 15099 Outside IAA to westOB090_SAR 487628 7776817 241.53 20 23.2 8.3 TOFR aquifer 682 EPM 15099 Outside IAA to westOB101_SAR 487689 7776877 243.465 10 37 10 TOFR aquifer 621 EPM 15099 Outside IAA to westOB091_SAR 487769.6 7777008 247.193 5 8 8 TOFR aquifer 565 EPM 15099 Outside IAA to westOB092_SAR 487767.6 7777005 247.218 22 25 8 TOFR aquifer 565 EPM 15099 Outside IAA to eastOB119_SAR 489005 7776478 268.213 20 26 12 TOFR aquifer 785 ML 1574 Outside IAA to eastOB114_SAR 488723.7 7776833 257.98 12 24 10 TOFR aquifer 415 ML 1380 Inside IAAOB083_SAR 488786.4 7776933 260.016 3.5 4.5 4.5 TOFR aquifer 486 ML 1380 Inside IAAOB084_SAR 488782.7 7776932 259.861 17 20 4.5 TOFR aquifer 482 ML 1380 Inside IAAOB118_SAR 488661.9 7777107 253.785 10 25 16 TOFR aquifer 441 ML 1380 Inside IAAOB081_SAR 488644.7 7777303 252.119 6 9 9 TOFR aquifer 571 EPM 15099 Outside IAA to northOB082_SAR 488646.7 7777299 252.193 21.5 24.5 9 TOFR aquifer 568 EPM 15099 Outside IAA to northOB110_SAR 488365 7777248 257.307 19 25 12 TOFR aquifer 410 ML 1380 Inside IAAOB093_SAR 488132.4 7777269 251.036 6.3 9.3 9.3 TOFR aquifer 462 EPM 15099 Inside IAAOB094_SAR 488131.5 7777274 250.725 22.3 25.3 9.3 TOFR aquifer 467 EPM 15099 Inside IAAOB095_SAR 488173.4 7777356 248.113 4 6 NA TOFR aquifer 532 EPM 15099 Outside IAA to northOB080_SAR 488531.7 7777499 248.583 2 4 4 TOFR aquifer 694 EPM 15099 Outside IAA to northVS001_SAR 488338 7776717 263.787 NA NA NA Deep tonalite 128 ML 1380 Inside IAAVS002_SAR 488340 7776567 255.387 NA NA NA Deep tonailte 277 ML 100172 Inside IAAOB085_SAR 488370.7 7776506 255.888 5.5 8.5 8.5 TOFR aquifer 341 ML100172 Inside IAAOB086_SAR 488372.9 7776504 255.626 21.3 24.3 8.5 TOFR aquifer 344 ML 100172 Inside IAA55_MONTAGNE_01 486962 7776620 NA NA NA NA TOFR aquifer 1365 EPM 15099 Outside IAA to westGRIFFIN_01 489042 7777780 NA NA NA NA TOFR aquifer 1190 EPM 15099 Outside IAA to northeastSHOWGRD_01 488711 7777698 NA NA NA NA TOFR aquifer 946 EPM 15099 Outside IAA to northeastIMP_HOT_01 488523 7777455 NA NA NA NA TOFR aquifer 649 EPM 15099 Outside IAA to northPOOL_01 488874 7777839 NA NA NA NA TOFR aquifer 1146 EPM 15099 Outside IAA to northeastPARK_01 488419 7777402 NA NA NA NA TOFR aquifer 571 EPM 15099 Outside IAA to northIMP_HOT_02 488499 7777447 NA NA NA NA TOFR aquifer 634 EPM 15099 Outside IAA to north69_RAVEN_01 488805 7778084 NA NA NA NA TOFR aquifer 1337 EPM 15099 Outside IAA to northeastAINSWORTH_01 489097 7777674 NA NA NA NA TOFR aquifer 1146 EPM 15099 Outside IAA to northeastRAIL_HOT_01 488220 7777520 NA NA NA NA TOFR aquifer 684 EPM 15099 Outside IAA to north72_RAVEN_01 488911 7778060 NA NA NA NA TOFR aquifer 1359 EPM 15099 Outside IAA to northeast66_RAVEN_01 488866 7778029 NA NA NA NA TOFR aquifer 1311 EPM 15099 Outside IAA to northeast68_RAVEN_01 488886 7778033 NA NA NA NA TOFR aquifer 1323 EPM 15099 Outside IAA to northeastPRATCHET_01 486680 7775960 NA NA NA NA TOFR aquifer 1852 EPM 15099 Outside IAA to west67_RAVEN_01 488802 7778050 NA NA NA NA TOFR aquifer 1305 EPM 15099 Outside IAA to northeast16_ELLIOT 488637 7777297 NA NA NA NA TOFR aquifer 561 EPM 15099 Outside IAA to northeast109_DEIGHTON_01 489012 7777868 NA NA NA NA TOFR aquifer 1244 EPM 15099 Outside IAA to northeastSCHOOL_01 488647 7776985 NA NA NA NA TOFR aquifer 367 ML 100147 Inside IAALOOP_01 488650 7776918 NA NA NA NA TOFR aquifer 349 ML 1380 Inside IAA23_JOHN_01 488790 7777286 NA NA NA NA TOFR aquifer 655 EPM 15099 Outside IAA to northeast92_DEIGHTON_01 488903 7777681 NA NA NA NA TOFR aquifer 1028 EPM 15099 Outside IAA to northeast



6.5 Reporting program Potential drawdown in the TOFR aquifer due to mining the BRW pit is well understood from observations during mining of the Buck Reef pit, the Buck Reef underground mine and the Sarsfield/Nolans pit. The potential for environmental values for groundwater and surface water to be affected by BRW pit dewatering has been investigated in Section 5 and assessed to be low. It is therefore proposed that groundwater monitoring data collected for the initial UWIR will be reviewed and interpreted every 12 months rather than every six months.

The GMP, and condition E61 of the EA specify annual groundwater analyses which will be undertaken on groundwater monitoring data. It is proposed that these analyses will be expanded to include an assessment of the impacts of dewatering at the BRW pit, and that the annual groundwater analysis report will include a discussion of whether the monitoring data support the predicted extent of the IAA in Figure 20, and whether any further investigation is required to refine the modelled IAA.

Reporting to the OGIA is therefore proposed to be undertaken annually. Reporting to the OGIA is proposed to comprise a brief letter summarising the BRW dewatering aspects of the annual analysis, supported by and referencing the annual groundwater analysis.

The EA requires the first annual groundwater analysis to be completed using data collected to September 2020.



7. Part F – Spring impact management strategy

7.1 Background The potential for groundwater springs and seeps to be present near the Buck Reef Mine has been investigated in detail as part of the annual monitoring conducted under the REMP (TropWater, 2018). There are no springs or seeps within the IAA and groundwater is more than 10 m below surface within the IAA. The initial identification of possible springs and seeps outside the IAA has been based on the presence of trickle flows or long-lived pools within Elphinstone Creek in the dry season when little precipitation occurs. Further investigation undertaken by TropWater has included the calculation of water balances for flow conditions within the stream, hydrochemical typing of surface water chemistry along Elphinstone Creek, and the identification of locations where the hydrochemical type is potentially indicative of groundwater discharge. These investigations are summarised in Figure 21, and the reach of Elphinstone Creek to the north and northwest of Buck Reef pit has been identified to include locations where background groundwater expression could potentially contribute to the surface water flows.

7.2 Assessment of springs As discussed in Section 4, the reach of Elphinstone Creek from the confluence with Suhrs Creek to the confluence with One Mile Creek is the closest location to the BRW pit where background groundwater expression could potentially occur in some conditions. Mapping of Elphinstone Creek in this area during the REMP has not identified any specific location or vent for spring discharge, and if present groundwater discharge occurs as diffuse seepage through the weathered and fractured tonalite underlying Elphinstone Creek, which potentially contributes to the saturation of the stream sediments or to the trickle flows. Mapping of groundwater depths in Figure 11 confirms that groundwater may approach the base of the stream in some locations following significant recharge events. However based on the monitoring of upstream flow rates, and on the measured sulphate concentrations in surface water, it has been identified that other sources such as seepage from the Suhrs Creek Dam contribute to the observed trickle flows. Transient modelling of surface water groundwater interactions indicates that if drawdown from BRW pit dewatering extends to Elphinstone Creek, the seepage loss into the groundwater system would be 0.2 L/s to 0.3 L/s, which is small compared to the other inputs, and the risk to environmental values for surface water in this location is low.

Specific details of the potential springs and seeps which are required by the Water Act to be included in this initial UWIR are summarised as:

• Location: Potential diffuse discharge to Elphinstone Creek in the reach of Elphinstone Creek between the confluence with Suhrs Creek and the confluence with One Mile Creek.

• Connectivity: There is no confining layer and the streambed is in direct connection with the underlying TOFR aquifer, however groundwater depth varies from 0 mBGL to 3 mBGL and so there are periods where the intervening rocks are unsaturated.

• Risk: The potential springs and seeps are outside the IAA and potential losses into the underlying aquifer are modelled to be low compared to other inputs, therefore the risk to environmental values in this location is assessed to be low.

• Monitoring and mitigation: No mitigation is proposed. Monitoring will be undertaken to confirm that the hydrogeological model is valid and that the potential spring location lies outside the IAA, and the proposed monitoring is described in Section 7.3.



7.3 Management and monitoring strategy Management and monitoring of potential surface water changes in Elphinstone Creek will comprise:

• Three monthly measurement of groundwater depth at OB093_SAR, OB094_SAR and OB110_SAR as summarised in Table 6. These bores intersect the TOFR aquifer in the northern part of the IAA. They will be used to confirm that drawdown within the IAA due to BRW dewatering is as anticipated.

• Three monthly measurement of groundwater depths at OB095_SAR, OB081_SAR, OB082_SAR and OB080_SAR as summarised in Table 6. These bores are located between the IAA and Elphinstone Creek. They will be used to provide early warning of any mining related drawdown extending beyond the IAA and towards the zone of potential groundwater discharge.

• Annual REMP monitoring of the reach between Suhrs Creek and One Mile Creek to identify any changes which could potentially be attributed to groundwater drawdown due to BRW pit dewatering. Monitoring undertaken as part of the REMP in these locations occurs two times per year and comprises:

► Post wet season monitoring of surface water chemistry, water quality profiling, aquatic macroinvertebrates and fauna, sediment pore water chemistry, sediment geochemistry and a site condition assessment of the bed and banks.

► Late dry season monitoring of surface water chemistry, water quality profiling, aquatic macroinvertebrates and fauna, pore water chemistry, sediment geochemistry, vegetation survey and a site condition assessment of the bed and banks.

REMP monitoring commenced in 2015 and will continue throughout the operational period for the BRW pit as required by the EA. Monitoring is typically undertaken two times per year, with the timing of each monitoring event determined from the seasonal precipitation and flow conditions.

Groundwater depth monitoring in the Carpentaria Gold monitoring bores described above has been undertaken at three month intervals since August 2018 and will be continued by Carpentaria Gold at three month intervals throughout the mining and tailings storage operating periods for the BRW pit.

An assessment of the monitoring data collected under the spring management strategy will be included in the annual groundwater analysis required to be completed for the EA. Implications of the monitoring data with respect to potential impacts of environmental values for surface water in Elphinstone Creek will be interpreted and will be included in the annual summary provided to the OGIA.



References AARC 2020, Buck Reef West Project, Baseline Assessment Plan, AARC Environmental Solutions Pty Ltd.

BDH, 2020, Carpentaria Gold Pty Ltd, Ravenswood Groundwater Management Program, Big Dog Hydrogeology Pty Ltd.

DES 2017, Guideline, Underground Water Impact Reports and Final Reports, Department of Environment and Science.

DES 2018, Regional Groundwater Chemistry Zones: Fitzroy-Capricorn-Curtis Coast and Burdekin-Haughton-

Don Regions, Summary and Results, Draft for Consultation, Not Government Policy, Department of Environment and Science.

Marinelli, Fred & Niccoli, Walter, (2000), Simple Analytical Equations for Estimating Ground Water Inflow to

a Mine Pit, Ground Water, 38, pp. 311-314.

SLR 2017, Buck Reef West Expansion Project, Hydrogeology Technical Report, SLR Consulting.

SRK 2018, Ravenswood Mine, Nolans TSF Expansion, Concept Design Report, SRK Consulting.

TropWater 2018, Carpentaria Gold, Receiving Environment Monitoring Program, 1 Nov 2017 to 31 Oct 2018, TropWater.



List of Figures 1. Buck Reef Mine location 2. Buck Reef Mine detail 3. Underground water take in 2019 4. Estimated underground water inflow rate to BRW pit 5. Database groundwater depths 6. Groundwater elevations at Sarsfield/Nolans Pit 7. Groundwater elevations at Buck Reef pit part 1 8. Groundwater elevations at Buck Reef pit part 2 9. Responses to 2019 dewatering 10. Buck Reef pit groundwater elevations and flow directions in 2018 11. Interpolated groundwater depths in 2018 12. Geological section BRW1 13. Hydrogeological section BRW1 14. BRW pit perimeter section 15. Registered bores in DNRME database 16. Bore census results 17. Analytical model 18. SeepW section model A 19. SeepW section model B 20. Map of the Immediately and Long Term Affected Areas 21. Seepage conditions in Elphinstone Creek below Suhrs Creek 22. Seepage rates and recovery at Suhrs Creek Dam 23. Monitoring strategy



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Sandy CreekProcessing Site

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CattleGrazing

CattleGrazing

Nolans WasteRock Dump

RavenswoodTownship

Buck ReefMineSite

HistoricMining Area

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OB079_SAR

OB080_SAR

OB081_SAR

OB082_SAR

OB083_SAROB084_SAR

OB085_SAR

OB086_SAR

OB087_SAR

OB088_SAR

OB089_SAR OB090_SAR

OB091_SAROB092_SAR

OB093_SAR

OB094_SAR

OB095_SAR OB005_SC

OB009_SC

OB010_SC

OB012_SC

OB014A_SC

OB023_SC

OB024_SC

OB026_SC

OB027_SCOB028_SC

OB029_SC

PZ 1_NOL

PZ 16_NOL PZ 20_NOL

PZ2_SAR

VS001_SAR

VS002_SAR

OB126_NOL

OB100_SAR

OB101_SAR

OB102_SAR

OB103_SAR

OB104_SAR

OB105_SAR

OB106_SAR

OB107_SAR

OB108_SAR

OB036_SCOB110_SAR

OB111_SAR

OB112_SAR

OB113_SAR

OB114_SAR

OB115_SAR

OB116_SAR

OB117_SAR

OB118_SAR

OB119_SAR

OB007A_SC

OB084_NOL

OB085_NOL

OB086_NOL

OB087_NOL

OB103_NOL

OB104_NOL

OB105_NOL OB106_NOL

we029_RC

OB057A_SAR

OB059_SAR

OB001A_SC

OB006_SC

OB096_SAROB097_SAR

OB098_SAROB099_SAR

OB066_NOL

OB067_NOLOB072_NOL

OB109_NOL

OB062_SAR

OB008_SC

OB071A_NOLOB108_NOL

OB004A_SC

OB017A_SC

OB025_SC

OB068A_NOL

OB112_NOLOB125_NOL

OB113_NOLOB114_NOL

OB115_NOLOB116_NOL

487000

487000

488000

488000

489000

489000

490000

490000

491000

491000

492000

492000

7776

000

7776

000

7777

000

7777

000

7778

000

7778

000

G:\P

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H P

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d\G

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igur

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RW

Pit

Initi

al U

WIR

Buck Reef Mine location

Figure 1

Report:

BRW Pit Initial UWIR

Date:March 2020

Legend

#* Abandoned Bore

!( Monitoring Bore

!H Surface water sampling site

") Town

Road

Track

Drainage

Map projection: Transverse MercatorHorizontal Datum: Geocentric Datum of Australia 1994Grid: Map Grid of Australia, Zone 55

This map contains data which are (C) Copyright Commonwealthof Australia (Geoscience Australia) 2006.Imagery from May 2017.

0 0.5 1Km

´

")

#*

!(

!(

!(

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Buck ReefMine Site

HistoricMining Area

Sarsfield/NolansPit

BUR

DEKIN

FALLS DAM

RO

AD

Elphinstone Creek

Ravenswood

New BuckReef WRSF

BRW Pit

Jessop's Creek Fault

Buck Reef Fault

Mill Fault

SW078_SAR

85705

85706

85707

85708

85709

85710

85711

OB057_SAR

OB071_NOL

OB030_RC

OB080_SAR

OB081_SAR

OB082_SAR

OB083_SAROB084_SAR

OB085_SAR

OB086_SAR

OB087_SAR

OB088_SAR

OB089_SAROB090_SAR

OB091_SAROB092_SAR

OB093_SAR

OB094_SAR

OB095_SAR

PZ2_SAR

VS001_SAR

VS002_SAR

OB101_SAR

OB102_SAROB103_SAR

OB110_SAR

OB111_SAR

OB114_SAR

OB115_SAR

OB116_SAR

OB118_SAR

OB119_SAR

OB057A_SAR

OB059_SAR

OB066_NOL

OB072_NOL

OB071A_NOL

BRW1

487000

487000

487500

487500

488000

488000

488500

488500

489000

489000

489500

489500

7776

500

7776

500

7777

000

7777

000

7777

500

7777

500

G:\P

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H P

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aria

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IS\F

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Pit

Initi

al U

WIR

Buck Reef Mine detail

Figure 2

Report:


Date:March 2020

Legend

#* Abandoned Bore

!( Monitoring Bore

"J Registered bore identified in 2017


Hydrogeological section

BRW pit

New Buck Reef WRSF

Extent of underground workings

Bund locations

Fault

") Town

Road

Track

Drainage



0 0.25 0.5Km

´

C:\U

sers

\Sim

on\D

ocum

ents

\Rep

orts

\BD

H\R

aven

swoo

d\R

aven

swoo

d U

WIR

Underground water take in 2019

Figure 3

Report:

Carpentaria GoldBRW Pit Initial UWIR

Date:March 2020

0

10

20

30

40

50

60

70

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

Oct 19 Nov 19 Dec 19 Jan 20 Feb 20 Mar 20

Ave

rage

rate

of t

ake

of u

nder

grou

nd w

ater

(L/s

)

Cum

ulat

ive

take

of u

nder

grou

nd w

ater

(m3)

Cumulative volume Average rate

C:\U

sers

\Sim

on\D

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ents

\Rep

orts

\BD

H\R

aven

swoo

d\R

aven

swoo

d U

WIR

Estimated underground water inflow rate to BRW pit

Figure 4

Report:


Date:March 2020

Note: Graph sourced from SLR, 2017.

C:\U

sers

\Sim

on\D

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ents

\Rep

orts

\BD

H\R

aven

swoo

d\R

aven

swoo

d U

WIR

Database groundwater depths

Figure 5

Report:


Date:March 2020

Note: Graph sourced from SLR, 2017.

C:\U

sers

\Sim

on\D

ocum

ents

\Rep

orts

\BD

H\R

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swoo

d\R

aven

swoo

d U

WIR

Groundwater elevations at Sarsfield/Nolans Pit

Figure 6

Report:


Date:March 2020

0

200

400

600

800

1,000

1,200

200202204206208210212214216218220222224226228230232234236238240242244246248250252254256258260262264266268270

Jan-94 Jan-96 Jan-98 Jan-00 Jan-02 Jan-04 Jan-06 Jan-08 Jan-10 Jan-12 Jan-14 Jan-16 Jan-18 Jan-20 Jan-22

Mon

thly

pre

cipi

tatio

n (m

m)

Gro

undw

ater

ele

vatio

n (m

AHD)

OB109_NOL OB070_SAR PZ2_SAR OB068A_NOL OB071A_NOL

OB066_NOL OB072_NOL OB071_NOL OB067_NOL OB068_NOL

OB069_NOL OB070_NOL OB062_SAR OB126_NOL OB105_SAR

OB106_SAR OB108_NOL Sars/Nol pit Monthly precipitation

C:\U

sers

\Sim

on\D

ocum

ents

\Rep

orts

\BD

H\R

aven

swoo

d\R

aven

swoo

d U

WIR

Groundwater elevations at Buck Reef pit part 1

Figure 7

Report:


Date:March 2020

0

100

200

300

400

500

600

700

800

900

1,000

1,100

1,200

1,300

1,400

1,500

220

222

224

226

228

230

232

234

236

238

240

242

244

246

248

250

252

254

256

258

260

Jan-98 Jan-00 Jan-02 Jan-04 Jan-06 Jan-08 Jan-10 Jan-12 Jan-14 Jan-16 Jan-18 Jan-20 Jan-22

Mon

thly

pre

cipi

tatio

n (m

m)

Gro

undw

ater

ele

vatio

n (m

AHD)

OB030_RC OB059_SAR VS001_SAR OB080_SAR Buck Reef pit VS002_SAR

OB083_SAR OB084_SAR OB087_SAR OB091_SAR OB092_SAR OB093_SAR

OB094_SAR OB095_SAR OB101_SAR Sars/Nol pit OB102_SAR OB048_SAR

OB114_SAR OB118_SAR Monthly precipitation

C:\U

sers

\Sim

on\D

ocum

ents

\Rep

orts

\BD

H\R

aven

swoo

d\R

aven

swoo

d U

WIR

Groundwater elevations at Buck Reef pit part 2

Figure 8

Report:


Date:March 2020

0

100

200

300

400

500

600

700

800

900

1,000

1,100

1,200

1,300

1,400

1,500

220

222

224

226

228

230

232

234

236

238

240

242

244

246

248

250

252

254

256

258

260

Jan-98 Jan-00 Jan-02 Jan-04 Jan-06 Jan-08 Jan-10 Jan-12 Jan-14 Jan-16 Jan-18 Jan-20 Jan-22

Mon

thly

pre

cipi

tatio

n (m

m)

Gro

undw

ater

ele

vatio

n (m

AHD)

OB081_SAR OB082_SAR OB085_SAR OB086_SAR OB088_SAR OB089_SAR

OB090_SAR OB100_SAR Sars/Nol pit OB103_SAR OB110_SAR OB111_SAR

OB112_SAR OB115_SAR OB116_SAR OB117_SAR OB119_SAR Monthly precipitation

C:\U

sers

\Sim

on\D

ocum

ents

\Rep

orts

\BD

H\R

aven

swoo

d\R

aven

swoo

d U

WIR

Responses to 2019 dewatering

Figure 9

Report:


Date:March 2020

0

100

200

300

400

500

600

700

800

900

1,000

1,100

1,200

1,300

1,400

1,500

214

216

218

220

222

224

226

228

230

232

234

236

238

240

242

244

246

248

250

252

254

Jan-14 Jan-15 Jan-16 Jan-17 Jan-18 Jan-19 Jan-20 Jan-21

Mon

thly

pre

cipi

tatio

n (m

m)

Gro

undw

ater

ele

vatio

n (m

AHD)

OB059_SAR VS001_SAR Buck Reef pit VS002_SAR OB085_SAR OB086_SAR

OB093_SAR OB094_SAR OB110_SAR OB114_SAR OB118_SAR Monthly precipitation

")

#*

#*

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Sarsfield/NolansPit

CattleGrazing

CattleGrazing


RavenswoodTownship

Buck ReefMineSite

HistoricMining Area

SarsfieldWaste

Rock Dump


Dam

Mine Village

Process Pond


BUR

DEKIN

FALLS DAM

RO

AD

Suhrs Creek

Elphinstone Creek

Ravenswood

258256254252250248

212

262260

216

218

214

210

264

234

246

242

244

226

272

270268

266264

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242

240

238

276

274

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236

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244

24224

0

238

236

222

262

244

262

248

244

244

242

238

234

232

230

212

SW078_SAR

OB007_NOL

OB042_NOL

OB057_SAR

OB001_SC

OB004_SC

OB014_SC

OB083_NOL

OB007_SC

OB007B_SC

OB034A_NOL

OB045_NOL

OB047_NOL

OB068_NOLOB071_NOL

OB069_NOL

OB070_NOL

OB092_NOLOB093_NOL

OB107_NOL

OB111_NOL

OB030_RC

OB048_SAR

OB066_SAROB067_SAR

OB068_SAR

OB070_SAR

OB072_SAROB073_SAR

OB074_SAR

OB075_SAR

OB076_SAR

OB077_SAR OB078_SAR

OB079_SAR

OB080_SAR

OB081_SAR

OB082_SAR

OB083_SAROB084_SAR

OB085_SAR

OB086_SAR

OB087_SAR

OB088_SAR

OB089_SAR OB090_SAR

OB091_SAROB092_SAR

OB093_SAR

OB094_SAR

OB095_SAR OB005_SC

OB009_SC

OB010_SC

OB012_SC

OB014A_SC

OB023_SC

OB024_SC

OB026_SC

OB027_SCOB028_SC

OB029_SC

PZ 1_NOL

PZ 16_NOL PZ 20_NOL

PZ2_SAR

VS001_SAR

VS002_SAR

OB126_NOL

OB100_SAR

OB101_SAR

OB102_SAR

OB103_SAR

OB104_SAR

OB105_SAR

OB106_SAR

OB107_SAR

OB108_SAR

OB036_SCOB110_SAR

OB111_SAR

OB112_SAR

OB113_SAR

OB114_SAR

OB115_SAR

OB116_SAR

OB117_SAR

OB118_SAR

OB119_SAR

OB007A_SC

OB084_NOL

OB085_NOL

OB086_NOL

OB087_NOL

OB103_NOL

OB104_NOL

OB105_NOL

OB106_NOL

we029_RC

OB057A_SAR

OB059_SAR

OB001A_SC

OB006_SC

OB096_SAROB097_SAR

OB098_SAROB099_SAR

OB066_NOL

OB067_NOLOB072_NOL

OB109_NOL

OB062_SAR

OB008_SC

OB071A_NOLOB108_NOL

OB004A_SC

OB017A_SC

OB025_SC

OB068A_NOL

OB112_NOL OB125_NOL

OB113_NOLOB114_NOL

OB115_NOLOB116_NOL

487000

487000

488000

488000

489000

489000

490000

490000

491000

491000

492000

492000

7776

000

7776

000

7777

000

7777

000

7778

000

7778

000

G:\P

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IS\F

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Pit

Initi

al U

WIR

Buck Reef pit groundwater elevations and flow directions in 2018

Figure 10

Report:


Date:March 2020

Legend

#* Abandoned Bore

!( Monitoring Bore


Interpolated groundwaterelevation 2018 (mAHD)

Groundwater flow direction

") Town

Road

Track

Drainage



0 0.5 1Km

´

")

#*

#*

#*

#*

#*

#*

!(

#*

!(

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SarsfieldWaste

Rock Dump


Dam

Mine Village

Process Pond


BUR

DEKIN

FALLS DAM

RO

AD

Suhrs Creek

Elphinstone Creek

Ravenswood

10

3

1

10

3

0

3

0

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1

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10

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1

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0

10

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10

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10

10

10

10

10

10

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3

SW078_SAR

OB007_NOL

OB042_NOL

OB057_SAR

OB001_SC

OB004_SC

OB014_SC

OB083_NOL

OB007_SC

OB007B_SC

OB034A_NOL

OB045_NOL

OB047_NOL

OB068_NOLOB071_NOL

OB069_NOL

OB070_NOL

OB092_NOL

OB093_NOL

OB107_NOL

OB111_NOL

OB030_RC

OB048_SAR

OB066_SAROB067_SAR

OB068_SAR

OB070_SAR

OB072_SAROB073_SAR

OB074_SAR

OB075_SAR

OB076_SAR

OB077_SAR OB078_SAR

OB079_SAR

OB080_SAR

OB081_SAR

OB082_SAR

OB083_SAROB084_SAR

OB085_SAR

OB086_SAR

OB087_SAR

OB088_SAR

OB089_SAR OB090_SAR

OB091_SAROB092_SAR

OB093_SAR

OB094_SAR

OB095_SAR OB005_SC

OB009_SC

OB010_SC

OB012_SC

OB014A_SC

OB023_SC

OB024_SC

OB026_SC

OB027_SCOB028_SC

OB029_SC

PZ 1_NOL

PZ 16_NOL PZ 20_NOL

PZ2_SAR

VS001_SAR

VS002_SAR

OB126_NOL

OB100_SAR

OB101_SAR

OB102_SAR

OB103_SAR

OB104_SAR

OB105_SAR

OB106_SAR

OB107_SAR

OB108_SAR

OB036_SCOB110_SAR

OB111_SAR

OB112_SAR

OB113_SAR

OB114_SAR

OB115_SAR

OB116_SAR

OB117_SAR

OB118_SAR

OB119_SAR

OB007A_SC

OB084_NOL

OB085_NOL

OB086_NOL

OB087_NOL

OB103_NOL

OB104_NOL

OB105_NOL OB106_NOL

we029_RC

OB057A_SAR

OB059_SAR

OB001A_SC

OB006_SC

OB096_SAROB097_SAR

OB098_SAROB099_SAR

OB066_NOL

OB067_NOLOB072_NOL

OB109_NOL

OB062_SAR

OB008_SC

OB071A_NOLOB108_NOL

OB004A_SC

OB017A_SC

OB025_SC

OB068A_NOL

OB112_NOLOB125_NOL

OB113_NOLOB114_NOL

OB115_NOLOB116_NOL

487000

487000

488000

488000

489000

489000

490000

490000

491000

491000

492000

492000

7776

000

7776

000

7777

000

7777

000

7778

000

7778

000

G:\P

roje

cts\

BD

H P

roje

cts\

Rav

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d\G

IS\F

igur

es\B

RW

Pit

Initi

al U

WIR

Interpolated groundwater depths in 2018

Figure 11

Report:


Date:March 2020

Legend

#* Abandoned Bore

!( Monitoring Bore


") Town

Road

Track

Drainage

Interpolated depth to shallowgroundwater (m)



0 0.5 1Km

´

Interpolated depth toshallow groundwater (m)

G:\P

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cts\

BD

H P

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- Car

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Gol

d\G

IS\F

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RW

Pit

Initi

al U

WIR

Report:


Date:March 2020

JJ

JJJ

JJ

JJ

JJ

JJJ

JJJJ

JJ

JJJ

JJ

JJJJJJJJJJJ

JJ

JJJJJ

Elev

atio

n (m

AHD

)W E

Natural surface

Top of fresh rock

Buck Reef WRSF

Weathered tonalite

Fresh tonalite

Pit lake

Underground workings

Monitoring bore

J JJ J J J J J J J Monitoring bore screen

Horizontal scale

Vertical exaggeration 5 x

0 100 200 300 400 m


Buck ReefWRSF Buck Reef

Pit

Nolans/Sarsfield

Pit

ElphinstoneCreek

Horizontal distance (m)

OB088_SAR

OB089_SAROB090_SAR

OB083_SAROB084_SAR

OB059_SAROB030_RCOB115_SAR

?(Depth

unknown)

Lake elevation214 mAHD

in Nov 2018

BRW pit

0 200 400 600 800 1000 1200 1400 1600 1800 2000

-40

0

40

80

120

160

200

240

Figure 12

Geological section BRW1

G:\P

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BD

H P

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- Car

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Gol

d\G

IS\F

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es\B

RW

Pit

Initi

al U

WIR

Report:


Date:March 2020

JJ

JJJJJJJJJJJJJJ

JJ

JJJJJJJJJ

JJ

JJJJJJJJJJJJJJ

JJ

JJJJJJJ

JJ

JJJJJJJJJJ

JJ

JJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ

JJ

JJJJJJJJJJJJJJJJJJJJJJJJ

!H

!H

!H

!H

Elev

atio

n (m

AHD

)W E

Natural surface

Top of fresh rock

Buck Reef WRSF

Weathered tonalite

Fresh tonalite

Pit lake


Monitoring bore

J JJJJJJJJJMonitoring bore screen

!HMain groundwater inflowzone

Groundwater elevation in2018 (mAHD)

Groundwater flow

Horizontal scale

Vertical exaggeration 20 x

0 100 200 300 400 m

Undergroundworkings

Buck ReefWRSF

Buck ReefPit

Nolans/Sarsfield

Pit

ElphinstoneCreek

Horizontal distance (m)

OB088_SAROB089_SAROB090_SAR

OB083_SAR

OB084_SAR

OB059_SAR

0.4 L/sat 8 m

< 0.1 L/sat 13 m

0 200 400 600 800 1000 1200 1400 1600 1800

210

220

230

240

250

260

270

Dryat 20 m

OB030_RC

OB115_SAR

5.5 L/s (?)at 11 m?

(Depthunknown)


in Nov 2018

BRW Pit


in Nov 2018

Figure 13

Hydrogeological section BRW1

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Date:March 2020

220

230

240

250

260

270

280

0 500 1000 1500 2000 2500

Elev

atio

n (m

AHD

)

Distance anticlockw ise around pit perimeter (m)

Ground surface TOFR Lowest groundwater elevation to west

Lowest groundwater elevation to east Current pit lake 2018 groundwater elevation

N SW E N

Figure 14

BRW pit perimeter section

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Date:March 2020

Note: Retrieved from Queensland Globe, Registered Water Bores Layer, on 12 March 20202 km radius from Buck Reef Pit

Figure 15

Registered bores in DNRME database

")

#*

!(

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!(

!(

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!(

!(

!(

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!(

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!(

!(

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!(

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!(

!(

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Sarsfield/NolansPit

CattleGrazing

RavenswoodTownship

BuckReef

Mine Site

HistoricMining Area

Process Pond


BUR

DEKIN

FALLS DAM

RO

AD

Suhrs Creek

Elphinstone Creek

Ravenswood

SW078_SAR

IMP_HOT_02

POOL_01

GRIFFIN_01

ELLIOT_01

PARK_01

PRATCHET_01

61_RAVEN_01

53_RAVEN_01 66_RAVEN_0168_RAVEN_01

109_DEIGHTON_01

69_RAVEN_01

55_MONTAGNE_01

SHOWGRD_01

SCHOOL_01

IMP_HOT_01

LOOP_01

TOWN_WINDMILL_01

AINSWORTH_01

RAIL_HOT_01

HOLLYOAK_01

23_JOHN_0116_ELLIOT

92_DEIGHTON_01

PO_WINDMILL_01

72_RAVEN_01

28_RAVEN

SeepW Section B

SeepW Section A

OB057_SAR

OB034A_NOL

OB047_NOL

OB068_NOLOB071_NOL

OB069_NOL

OB070_NOL

OB092_NOL

OB093_NOL

OB030_RC

OB048_SAR

OB080_SAR

OB081_SAR

OB082_SAR

OB083_SAROB084_SAR

OB085_SAROB086_SAR

OB087_SAR

OB088_SAR

OB089_SAR

OB090_SAR

OB091_SAR

OB092_SAR

OB093_SAR

OB094_SAR

OB095_SAR

PZ2_SAR

VS001_SAR

VS002_SAR

OB100_SAR

OB101_SAR

OB102_SAROB103_SAR

OB104_SAR

OB105_SAR

OB110_SAR

OB111_SAR

OB112_SAR

OB113_SAR

OB114_SAR

OB115_SAR

OB116_SAR

OB117_SAR

OB118_SAR

OB119_SAR

OB057A_SAR

OB059_SAR

OB066_NOL

OB067_NOLOB072_NOL

OB071A_NOL

OB108_NOL

OB068A_NOL

OB112_NOLOB125_NOL

OB114_NOL

487000

487000

488000

488000

489000

489000

490000

490000

7776

000

7776

000

7777

000

7777

000

7778

000

7778

000

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Date:March 2020

Legend

#* Abandoned Bore

!( Monitoring Bore


$1 Water supply bore in use

!? Inactive water supply bore

SeepW sections

") Town

Road

Track

Drainage



0 0.25 0.5Km ´

Figure 16

Bore census results

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Date:March 2020

Note: Reproduced from SLR, 2017.

Figure 17

Analytical model

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Date:March 2020


Figure 18

SeepW section model A

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Date:March 2020


Figure 19

SeepW section model B

")

#*

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#*

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#*

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Sarsfield/NolansPit

CattleGrazing

RavenswoodTownship

BuckReef

Mine Site

HistoricMining Area

Process Pond


BUR

DEKIN

FALLS DAM

RO

AD

Suhrs Creek

Elphinstone Creek

Ravenswood

New BuckReef WRSF

BRW Pit

SW078_SAR

IMP_HOT_02

POOL_01

GRIFFIN_01

ELLIOT_01

PARK_01

PRATCHET_01

61_RAVEN_01

53_RAVEN_01 66_RAVEN_0168_RAVEN_01

109_DEIGHTON_01

69_RAVEN_01

55_MONTAGNE_01

SHOWGRD_01

SCHOOL_01

IMP_HOT_01

LOOP_01

TOWN_WINDMILL_01

AINSWORTH_01

RAIL_HOT_01

HOLLYOAK_01

23_JOHN_0116_ELLIOT

92_DEIGHTON_01

PO_WINDMILL_01

72_RAVEN_01

28_RAVEN

85705

85706

85708

85711

SeepW Section B

SeepW Section A

OB057_SAR

OB034A_NOL

OB068_NOLOB071_NOL

OB069_NOL

OB070_NOL

OB092_NOL

OB093_NOL

OB030_RC

OB048_SAR

OB080_SAR

OB081_SAR

OB082_SAR

OB083_SAROB084_SAR

OB085_SAROB086_SAR

OB087_SAR

OB088_SAR

OB089_SAR

OB090_SAR

OB091_SAR

OB092_SAR

OB093_SAR

OB094_SAR

OB095_SAR

PZ2_SAR

VS001_SAR

VS002_SAR

OB100_SAR

OB101_SAR

OB102_SAROB103_SAR

OB104_SAR

OB105_SAR

OB110_SAR

OB111_SAR

OB112_SAR

OB113_SAR

OB114_SAR

OB115_SAR

OB116_SAR

OB117_SAR

OB118_SAR

OB119_SAR

OB057A_SAR

OB059_SAR

OB066_NOL

OB067_NOLOB072_NOL

OB071A_NOL

OB108_NOL

OB068A_NOL

OB112_NOLOB125_NOL

OB114_NOL

487000

487000

488000

488000

489000

489000

490000

490000

7776

000

7776

000

7777

000

7777

000

7778

000

7778

000

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Date:March 2020

Legend

#* Abandoned Bore

!( Monitoring Bore


$1 Water supply bore in use

!? Inactive water supply bore

#* Abandoned water supply bore

SeepW sections

BRW pit

New Buck Reef WRSF

Expected area, IAA and LTAA

Maximum area at 95%confidence

Maximum area

") Town

Road

Track

Drainage


This map contains data which are (C) Copyright Commonwealth of Australia (Geoscience Australia) 2006.Imagery from May 2017.

0 0.25 0.5Km ´

Figure 20

Map of the Immediately and Long Term Affected Areas

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Date:March 2020

Note: Seepage observations provided by TropWater.

Figure 21

Seepage conditions in Elphinstone Creek below Suhrs Creek

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Report:Carpentaria Gold


Date:March 2020


Figure 22

Seepage rates and recovery at Suhrs Creek Dam

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$K

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$K

$K

$K$K

$K

$K

$K

$K

$K

$K

$K

$K

$K

$K$K

$K

$K

#*

#*

#*

#*

#*

#*

#*

#*

#*

#*

#*

#*

#*

Sarsfield/NolansPit

CattleGrazing

RavenswoodTownship

Buck ReefMineSite

HistoricMining Area

Process Pond


BUR

DEKIN

FALLS DAM

RO

AD

Suhrs Creek

Elphin

stone

Creek

Ravenswood

BRW Pit

IMP_HOT_02

POOL_01

GRIFFIN_01

PARK_01

67_RAVEN_01

PRATCHET_01

66_RAVEN_0168_RAVEN_01

109_DEIGHTON_01

69_RAVEN_01

55_MONTAGNE_01

SHOWGRD_01

SCHOOL_01

IMP_HOT_01

LOOP_01

AINSWORTH_01

RAIL_HOT_01

23_JOHN_0116_ELLIOT

92_DEIGHTON_01

72_RAVEN_01

SW096_SAR

SW078_SAR

SW037_SAR

SW035_SAR

SW067_SAR

SW092_SAR

SW070_SAR

SW071_SAR

SW075_SAR

SW003_RC

SW057_SAR

SW079_SAR

SW098_SAR

OB085_SAR

OB086_SAR

VS001_SAR

VS002_SAR

OB069_NOL

OB070_NOL

OB092_NOL

OB093_NOL

OB030_RC

OB048_SAR

OB080_SAR

OB081_SAR

OB082_SAR

OB083_SAROB084_SAR

OB087_SAR

OB088_SAR

OB089_SAROB090_SAR

OB091_SAR

OB092_SAR

OB093_SAR

OB094_SAR

OB095_SAR

PZ2_SAR

OB100_SAR

OB101_SAR

OB102_SAROB103_SAR

OB104_SAR

OB105_SAR

OB110_SAR

OB111_SAR

OB112_SAR

OB113_SAR

OB114_SAR

OB115_SAR

OB116_SAR

OB117_SAR

OB118_SAR

OB119_SAR

OB057A_SAR

OB059_SAR

OB066_NOL

OB067_NOLOB072_NOL

OB071A_NOL

OB108_NOL

OB068A_NOL

OB112_NOLOB125_NOL

OB114_NOL

487000

487000

488000

488000

489000

489000

490000

490000

7776

000

7776

000

7777

000

7777

000

7778

000

7778

000

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Date:March 2020

Legend

!(Carpentaria Gold monitoring bore,depth monitoring every three months

!( Bore to be monitored until mined out

$KWater supply bore, depth monitoringevery three months when accessible

#* EA surface water monitoring site

BRW pit

") Town

Road

Track

Drainage



0 0.25 0.5Km ´

Figure 23

Monitoring strategy



Appendix A Bore Construction Details



Bore Easting NorthingGround

Elevation Stick UpCasing

Elevation Bore LogBore Video

Cased Depth

Top of Screen

Base of Screen

Logged Top of Fresh Rock Location notes

mAHD m mAHD Available Available mBGL mBGL mBGL mBGLOB001_MTW 482850.33 7784718.564 341.596 N Y 1 NA NA North of Mt Wright, down gradient of Glory Hole, beside creekOB001_SC 491515.38 7776492.229 257.864 0.99 258.854 N Y 3.5 Beside Sandy Creek western tributary, down gradient of Sandy Creek siteOB001A_MTW 482856.61 7784716.675 342.135 0.63 342.765 N Y 31.11 13.5 30.5 North of Mt Wright, down gradient of Glory Hole, beside creek (redrill of OB001)OB001A_SC 491511.91 7776491.979 257.834 1.04 258.874 N Y 25.8 7.6 24.8 Beside Sandy Creek western tributary, down gradient of Sandy Creek site (re-drill)OB001B_SC 491518.23 7776491.539 257.798 0.515 258.313 N Y 2 Beside Sandy Creek western tributary, down gradient of Sandy Creek site (re-drill)OB002_MTW 482841.16 7784309.417 373.198 0.681 373.879 N Y 25.56 2 25 At base of Glory Hole operations areaOB002_NOL 490010.7 7775037.455 249.251 0.48 249.731 N Y 3.87 2 Beside Nolans GullyOB003_MTW 482796.55 7784398.309 381.625 1.115 382.74 N Y 26.32 2 26 To side of Glory Hole area, at base of old waste dump footprintOB004_NOL 489169.07 7774483.957 252.05 0.77 252.82 N Y 21.8 3.3 21 On NTSF drainage line (without seepage trench)OB004_SC 491956.46 7777164.582 267.326 0.525 267.851 N N 26.18 Down gradient of SCTSFOB004A_SC 491957.72 7777174.95 267.176 0.51 267.686 N Y 26.5 7.3 25.8 Unknown Down gradient of SCTSF (re-drill)OB005_MTW 482036.82 7784061.428 330.698 0.68 331.378 N Y 30.6 15.6 30.5 Beside creek downstream of Mt Wright dam (outside fence)OB005_NOL 488830.56 7774610.372 253.731 0.96 254.691 N Y 27.7 3.6 27.3 On NTSF drainage line (down gradient of seepage trench)OB005_SC 491841.97 7777342.436 271.161 0.525 271.686 N Y 4.31 0.01 2 Unknown Beside seepage pond near toe of SCTSFOB005_SC 491819.31 7777333.655 271.201 Y N 12 6 12 Beside seepage pond near toe of SCTSFOB006_MTW 482106.62 7784028.835 332.407 0.72 333.127 N Y 34 22.6 33.5 Beside creek downstream of Mt Wright dam (inside fence)OB006_NOL 488480.41 7774802.153 251.482 0.51 251.992 N Y 0.3 On NTSF drainage line (down gradient of seepage trench)OB006_SC 491452.37 7777411.961 283.975 0.6 284.575 N Y 28.03 25 27.7 At south-western toe of SCTSFOB006A_NOL 488477.56 7774805.332 251.425 0.92 252.345 N Y 6.4 3 On NTSF drainage line (down gradient of seepage trench) (re-drill of OB006)OB007_MTW 482336.67 7783662.759 364.602 0.315 364.917 N Y 0 46.2 In carpark at front of mine siteOB007_NOL 488404.46 7775241.953 263.74 0.41 264.15 N Y 21.2 3 21 Along toe of NTSFOB007_SC 491436.59 7777559.761 285.106 0.62 285.726 N Y 25.23 7.2 24.7 At western toe of SCTSFOB007A_NOL 488405.45 7775226.586 263.329 0.985 264.314 N Y 42.2 3.3 41.8 Along toe of NTSFOB007A_SC 491436.43 7777562.461 285.185 1.05 286.235 N N At western toe of SCTSF (re-drill)OB007B_SC 491437.46 7777556.242 285.107 0.59 285.697 N N At western toe of SCTSF (re-drill)OB008_SC 491823.05 7777723.728 284.542 0.695 285.237 N Y 20.67 0.4 19 At north-eastern toe of SCTSF, close to start of drainage lineOB009_SC 491546.03 7776990.837 267.404 0.495 267.899 N Y 20.2 2.1 19.6 Unknown Centre of old operations/mill areaOB010_MTW 482646.04 7784225.225 418.17 0.13 418.3 N Y Drilled into Glory Hole drive (containing concrete backwash)OB010_NOL 489928.04 7774971.868 253.569 1.06 254.629 N Y 14.5 0.6 14 At immediate base of NTSF far eastern point (used as piezometer)OB010_SC 492052.7 7776628.501 263.311 0.91 264.221 N Y 19.9 1.8 19 Unknown At south-western toe of old ROW pondOB011_MTW 481694.98 7783665.748 342.663 0.536 343.199 Y Y 42.2 15.4 42.2 10 Behind ANE yard, separate of operations influenceOB011_SC 492358.96 7776625.491 258.957 0.61 259.567 N Y 6.045 3 5.8 At south-eastern toe of old ROW pondOB011A_SC 492356.78 7776623.853 259.599 Y N 24 12 24 22 At south-eastern toe of old ROW pondOB012_MTW 481813.7 7784245.3 326.74 0.412 327.152 Y N 37 4 37 6 North-east of Mt Wright, downgradient of current operations, constructed Feb 2017OB012_SC 492102.24 7777001.075 264.377 0.72 265.097 N Y 21.1 1.8 21.1 Unknown East of old heap leach pad (now removed)OB013_MTW 482265.91 7784576.91 317.874 0.356 318.23 Y N 30 9 12 11 N Lease boundary - Mt Wright - EEN 2OB014_MTW 482805.82 7784864.68 302.243 0.269 302.512 Y N 37 25 37 6 Down gradient of OB001 - Mt Wright - EEN 23OB014_SC 491756.76 7777491.815 292.119 0.565 292.684 N N Drilled through SCTSFOB014A_SC 491755.22 7777496.194 291.997 0.865 292.862 N Y 30.84 25 30.4 Unknown Drilled through SCTSF (re-drill)OB015_MTW 482665.4 7783833.2 319.291 0.39 319.681 Y N 30 18 30 13 Off lease - Mt Wright - EEN1OB015_SC 491710.31 7777682.436 291.911 0.81 292.721 N Y 3.11 Drilled through SCTSFOB016_MTW 482366.8 7783889.9 316.532 0.433 316.965 Y N 37 11 37 12 S Lease boundary - Mt Wright - EEN 3OB016_SC 491506.83 7777528.398 291.317 0.54 291.857 N Y 8.61 Outside toe of SCTSFOB016A_SC 491447 7777376.999 N N Drilled through SCTSFOB017_MTW 482770 7784064 378.988 0.447 379.44 Y N 67 61 67 16 Out back gate at MTW, up road to glory hole, to left of road near cleared area. EEN AOB017_SC 491682.81 7776678.451 266.253 0.37 266.623 N Y 25.47 13.5 25 East of old ROW ponds, south of heap leach padOB017A_SC 491678.7 7776675.621 266.109 0.96 267.069 N Y East of old ROW ponds, south of heap leach pad (re-drill)OB018_MTW 482756 7783710 346.478 0.267 346.745 Y N 7 41 47 15 Out back gate of MTW, down right hand track to Peter Moore's property on drainage line. EEN BOB018_SC 492315 7776262.995 N N Easter side of Sandy Creek upstreamOB022_NOL 488578.87 7774906.241 250.775 0.94 251.715 N 30.9 Along toe of NTSF (mainly used for WL)OB022_SC 491677.07 7777619.699 291.616 0.666 292.282 Y Y 40 15 40 13 Piezometer drilled into SCTSF tailingsOB023_NOL 488740.76 7774691.265 255.441 1.1 256.541 N 24.4 Along toe of NTSF (mainly used for WL)OB023_SC 491528.46 7777780.176 283.506 0.594 284.1 Y Y 17 11 17 17 Near north-western toe of SCTSFOB024_NOL 488594.09 7774598.914 250.047 0.915 250.962 N 5.6 NTSF seepage down gradient (outside fence)OB024_SC 491526.23 7777775.467 283.446 0.599 284.045 Y Y 60 22 60 16 Near north-western toe of SCTSFOB025_SC 491874.36 7777772.328 282.602 0.437 283.039 Y Y 43 16 43 16 Outside north-eastern toe of SCTSF (outside fence)OB026_NOL 488903.56 7774382.668 255.221 0.955 256.176 N Y 14.2 2.2 14 NTSF seepage down gradient (outside fence)OB026_SC 491408.56 7776715.133 261.581 0.573 262.154 Y N 25 6 25 12 On clean drainage line, upstream/east of old ROW pondsOB026A_NOL 488901.73 7774379.739 255.241 0.46 255.701 N Y 25.7 16.1 25 NTSF seepage down gradient (outside fence) (re-drill of OB026)OB027_SC 491597.54 7776651.736 262.692 0.576 263.268 Y Y 25 10 25 10 On small drainage line to east of old ROW pondsOB028_NOL 489369.09 7774344.346 254.789 1.1 255.889 N 8.94 NTSF seepage down gradient (outside fence)OB028_SC 491481.1 7776651.806 264.021 0.581 264.602 Y Y 25 12 25 13 In south-eastern wall of old ROW pondOB029_NOL 488484.22 7775044.983 259.485 0.8 260.285 N Along toe of NTSF (mainly used for WL)OB029_SC 491881.71 7777232.544 267.322 0.394 267.716 Y N 37 4 37 6 Sandy Creek site seepage recovery, constructed Feb 2017OB030_NOL 488489.83 7775022.778 258.256 0.71 258.966 N 11.99 Along toe of NTSF (mainly used for WL)OB030_RC 487694.1 7776667.803 243.222 0.311 243.533 N N Farmer's bore down gradient of Buck Reef siteOB030_SC 492300 7777450 270.059 0.484 270.543 Y 25 19 25 8 Out gate behind the tails dam. Down near Sandy Ck. EEN IOB031_NOL 488498.63 7774988.085 256.478 0.62 257.098 N Along toe of NTSF (mainly used for WL)OB031_SC 492650 7776500 259.897 0.391 260.288 Y 18 10 18 15 After Sandy Ck Crossing, turn left on track. Through paddock to left of track. EEN LOB032_NOL 488649.51 7774794.334 255.941 0.78 256.721 N Along toe of NTSF (mainly used for WL)OB032_RC 492209.15 7775640.665 253.997 0.73 254.727 N N Bore at Easton's house, associated with John Bull workings, used for cattle supply

OB032_SC 492463 7776063 Y N 37 7 37ME Bore. Drilled as part of 2017 EEN round for Margaret Easton. Solar pump on bore runs continuously. In paddock on left

just after SC crossing.OB033_NOL 488673.9 7774776.448 256.788 0.62 257.408 N Along toe of NTSF (mainly used for WL)

OB033_SC 492921 7775336 Y N 25 10 25CE bore. Drilled as part of 2017 EEN round for Colin Easton. Solar pump on bore runs continuously. In paddock on left past

Evlinton entrance.OB034A_NOL 488736.79 7775552.63 272.735 0.915 273.65 Y 16.3 2.2 16 Near toe of northern NTSF wallOB035_NOL 488475.02 7775088.974 262.688 0.94 263.628 N 19.72 Along toe of NTSF (mainly used for WL)OB036_NOL 488467.58 7775111.2 263.972 0.96 264.932 N Along toe of NTSF (mainly used for WL)OB036_SC 491134.85 7777207.92 271.984 0.534 272.518 37 13 37 13 Behind airstrip - EEN 24OB037_NOL 488458.64 7775129.916 264.161 0.98 265.141 N Along toe of NTSF (mainly used for WL)OB037_SC 492654.165 7777252.86 262.987 0.382 263.369 37 7 37 7 EEN 7. E of drainage line behind SCOB038_NOL 488445.2 7775149.412 263.334 0.93 264.264 N Along toe of NTSF (mainly used for WL)OB039_NOL 488430.79 7775175.417 263.271 0.86 264.131 N Along toe of NTSF (mainly used for WL)OB040_NOL 488425.39 7775199.872 263.503 0.95 264.453 N Along toe of NTSF (mainly used for WL)OB041_NOL 488420.63 7775224.507 264.067 0.965 265.032 N Along toe of NTSF (mainly used for WL)OB042_NOL 488381.1 7775354.17 267.743 0.94 268.683 N Y 22 0 0 Near north-western toe of NTSFOB043_NOL 489730.25 7774295.536 253.128 0.91 254.038 N Y 10.1 2 10 NTSF seepage down gradient (outside fence)OB043A_NOL 489730.47 7774292.236 253.114 0.47 253.584 N Y 26.1 15.3 25.5 NTSF seepage down gradient (outside fence) (re-drill of OB026)OB044_NOL 488372.68 7774856.622 251.15 0.93 252.08 N 4.9 NTSF seepage down gradient (outside fence)OB045_NOL 488292.3 7775130.116 256.443 0.95 257.393 N Y 19.8 1.9 19 NTSF seepage western (outside fence)OB046_NOL 488337.23 7774374.4 250.575 0.514 251.089 N Y 25.5 14.5 25.2 NTSF seepage down gradient (outside prefferential seepage path)OB046A_NOL 488333.24 7774374.44 250.691 0.19 250.881 Y Y 25.46 14 25 14 NTSF seepage down gradient (outside prefferential seepage path). Redrill of NOL_OB046. OB047_NOL 488354.44 7775467.577 265.821 0.9 266.721 N Y 24.07 3.2 24 NTSF seepage down gradient (outside fence)OB048_SAR 488363.75 7777973.717 262.899 0.935 263.834 N Y 19.5 In middle of backfilled Mellaneur Pit/Golf CourseOB057_SAR 489305.59 7777619.879 258.385 0.56 258.941 N Y 27.6 9.6 27 At base of SYC/OCA waste rock dump. OB057A_SAR 489302.68 7777624.758 257.857 1.13 258.987 Y Y 27 10 27 14 At base of SYC/OCA waste rock dump. Reddrill of OB057_SAROB059_SAR 487937.75 7776594.518 248.027 0.595 248.622 N Y 18 0.01 18 At toe of Buck Reef WRD, on drainage lineOB060_NOL 488313.59 7775296.982 264.493 0.915 265.408 N Y 13.07 4 2.5 NTSF seepage western (outside fence)OB062_SAR 490474.47 7775699.44 261.976 0.52 262.496 N Y 25.6 10.3 24.8 Between SWRD, NWRD and Nolans PitOB066_NOL 489511.57 7776495.578 278.472 0.9 279.372 N Y Sarsfield Pit TSF deep boreOB066_SAR 489475.59 7778287.823 257.538 0.47 258.004 Y Y 12 4 12 12 Between Elphinstone and Suhrs Creeks, upstream of townshipOB067_NOL 489767.21 7776267.484 277.711 1.15 278.861 N Y Sarsfield Pit TSF deep boreOB067_SAR 489472.37 7778285.294 257.488 0.46 257.948 Y Y 43 18 43 12 Between Elphinstone and Suhrs Creeks, upstream of townshipOB068_NOL 490036.71 7776134.281 275.462 1.12 276.582 N 100 Sarsfield Pit TSF deep boreOB068_SAR 491107.34 7775215.988 243.612 0.612 244.224 Y N 19 2 19 9.5 SWRD seepage recovery on Tea Tree Ck, constructed 2016OB068A_NOL 490051.87 7776203.828 0.36 275.703 Y N 100 51 100 21 Sarsfield Pit TSF deep boreOB069_NOL 490144.59 7775866.106 272.99 1.07 274.06 N Y Sarsfield Pit TSF deep boreOB069_SAR 490879.35 7774908.511 244.111 0.53 244.641 Y N 25 6 14 15.5 South-east of NWRD, constructed 2016OB070_NOL 490247.42 7775782.393 268.741 1.07 269.811 N Y Sarsfield Pit TSF deep boreOB070_SAR 490377.41 7775733.405 264.939 0.478 265.417 Y N 50 4 50 23.2 Nolans Pit dewatering bore, constructed Feb 2017OB071_NOL 489466.96 7776119.614 269.525 0.955 270.48 N Y Sarsfield Pit TSF deep boreOB071A_NOL 489523.47 7776079.306 267.77 0.71 268.48 Y N 100 23 100 25 Sarsfield Pit TSF deep bore (near dewatering plant). Redrill of OB071_NOL.OB072_NOL 489269.3 7776283.921 279.464 0.9 280.364 N Y Sarsfield Pit TSF deep boreOB072_SAR 490494.8 7778128.995 263.313 Y N 13 2 13 9 Suhrs Creek Dam seepage recovery, constructed Jul 2015OB073_NOL 488568.42 7774904.842 250.851 0.38 251.231 Y 18.55 2 16 15 NTSF seepage at toe of NTSF before seepage trenchOB073_SAR 490301 7778155 263.586 Y N 17 4 17 13.2 Suhrs Creek Dam seepage recovery, constructed Jul 2015



Bore Easting NorthingGround

Elevation Stick UpCasing

Elevation Bore LogBore Video

Cased Depth

Top of Screen

Base of Screen

Logged Top of Fresh Rock Location notes

mAHD m mAHD Available Available mBGL mBGL mBGL mBGLOB074_NOL 488565.17 7774912.13 250.811 0.39 251.201 Y 64.97 18 60 15 NTSF seepage at toe of NTSF before seepage trenchOB074_SAR 490584.5 7778218.997 265.949 N Y 22 4.5 21 Suhrs Creek Dam seepage monitoringOB075_NOL 488909.13 7774618.61 251.702 0.49 252.192 Y Y 18.75 4 16.8 13 NTSF seepage at toe of NTSF after seepage trenchOB075_SAR 490579 7778146.002 263.821 N Y 17.3 3.3 16 Suhrs Creek Dam seepage monitoringOB076_NOL 488903.36 7774618.84 251.731 0.43 252.161 Y Y 53.35 18 50 13 NTSF seepage at toe of NTSF after seepage trenchOB076_SAR 490570 7778050.002 266.904 N Y 24 4.4 23 Suhrs Creek Dam seepage monitoringOB077_NOL 489278.7 7774597.104 259.546 0.42 259.966 Y Y 23.62 2 22 18 NTSF seepage at toe of NTSF (no seepage trench)OB077_SAR 490252.2 7778209.999 262.803 Y Y 5 3 5 5 Suhrs Creek Dam seepage monitoring, constructed Jul 2015OB078_NOL 489275.22 7774596.275 259.369 0.41 259.779 Y Y 52.7 22 50 18 NTSF seepage at toe of NTSF (no seepage trench)OB078_SAR 490279.8 7778194.002 263.275 Y Y 10 2 10 5.3 Suhrs Creek Dam seepage monitoring, constructed Jul 2015OB079_NOL 489679.95 7774588.636 250.354 0.49 250.844 Y 16.7 2 16 14 NTSF seepage at toe of NTSF before seepage trenchOB079_SAR 490311.8 7778128.995 263.727 Y Y 16 3.5 16 8.5 Suhrs Creek Dam seepage monitoring, constructed Jul 2015OB080_NOL 489677.78 7774583.757 250.163 0.52 250.683 Y Y 53.16 16 50 14 NTSF seepage at toe of NTSF before seepage trenchOB080_SAR 488531.66 7777499.484 248.583 Y N 4 2 4 4 Beside Elphinstone Creek in centre of town, drilled as BRW 11, Feb 2017OB081_NOL 490196.85 7774887.475 247.551 0.49 248.041 Y Y 5.64 1 5 3 NTSF seepage beside Nolans GullyOB081_SAR 488644.71 7777303.473 252.119 Y N 9 6 9 9 On property behind Imperial Hotel, drilled as BRW 10a, Feb 2017OB081A_NOL 490193.53 7774884.994 248.131 Y N 6 4 6 NTSF seepage beside Nolans Gully. Redrill of OB081_NOL. Aug 2017. OB082_NOL 490200.99 7774887.515 247.195 0.54 247.735 Y Y 40.63 10 40 3 NTSF seepage beside Nolans GullyOB082_SAR 488646.65 7777298.944 252.193 Y N 24.5 21.5 24.5 9 On property behind Imperial Hotel, drilled as BRW 10b, Feb 2017OB082A_NOL 490197.83 7774885.466 247.571 Y N 50 44 50 NTSF seepage beside Nolans Gully. Redrill of OB082_NOL. Aug 2017. OB083_NOL 490967.21 7775107.89 246.926 0.54 247.466 Y Y 18.71 2 17 5 Unimpacted area behind WRDsOB083_SAR 488786.35 7776933.179 259.54 0.48 260.016 Y N 4.5 3.5 4.5 4.5 On road to Sarsfield Pit, drilled as BRW 4a, Feb 2017OB084_NOL 491331.6 7775582.744 251.987 0.35 252.337 Y Y 16.36 2 16 12 Down gradient of SWRDOB084_SAR 488782.67 7776931.859 259.36 0.5 259.861 Y N 20 17 20 4.5 On road to Sarsfield Pit, drilled as BRW 4b, Feb 2017OB085_NOL 491330.99 7775578.115 251.822 0.37 252.192 Y Y 50.55 16 50 12 Down gradient of SWRDOB085_SAR 488370.73 7776506.176 255.44 0.45 255.888 Y N 8.5 5.5 8.5 8.5 Beside Jessops Gully, before cemetery, drilled as BRW 5a, Feb 2017OB086_NOL 491392.44 7775896.75 252.951 0.44 253.391 Y Y 6.61 4 6 2 Down gradient of SWRDOB086_SAR 488372.85 7776503.636 255.18 0.45 255.626 Y N 24.3 21.3 24.3 8.5 Beside Jessops Gully, before cemetery, drilled as BRW 5b, Feb 2017OB087_NOL 491392.63 7775899.759 252.915 0.45 253.365 Y 37 11 34 2 Down gradient of SWRDOB087_SAR 487992.78 7776051.178 261.01 0.51 261.511 Y N 35 32 35 8.5 Beside Simmonds workshop access road, south-east of cemetery, drilled as BRW 1b, Feb 2017OB088_NOL 489210.62 7774169.711 244.805 0.46 245.265 Y 19 2 15 13 NTSF seepage down gradient of NTSF (outside fence)OB088_SAR 487883.69 7776554.416 244.61 0.5 245.102 Y N 18.4 15 18.4 3 Beside Jessops Gully, downstream of BRWWRD, drilled as BRW 6b, Feb 2017OB089_NOL 489211.94 7774164.822 244.676 0.44 245.116 Y Y 50 20 50 13 NTSF seepage down gradient of NTSF (outside fence)OB089_SAR 487624.42 7776813.853 241 0.54 241.537 Y N 8.3 5 8.3 8.3 Beside Jessops Gully before Elphinstone Ck, drilled as BRW 7a, Feb 2017OB090_NOL 488609.54 7774298.495 243.438 0.4 243.838 Y 22.31 2 16 16 NTSF seepage down gradient of NTSF (outside fence)OB090_SAR 487627.95 7776817.232 241.05 0.48 241.53 Y N 23.2 20 23.2 8.3 Beside Jessops Gully before Elphinstone Ck, drilled as BRW 7b, Feb 2017OB091_NOL 488606.38 7774296.725 243.374 0.39 243.764 Y Y 49 20 49 16 NTSF seepage down gradient of NTSF (outside fence)OB091_SAR 487769.57 7777008.484 246.69 0.5 247.193 Y N 8 5 8 8 North-east of BRW Pit, drilled as BRW 8a, Feb 2017OB092_NOL 489169.06 7775716.736 265.701 0.58 266.281 Y Y 11.69 2 9 7 North of NTSF, west of Processing PlantOB092_SAR 487767.61 7777005.154 246.69 0.52 247.218 Y N 25 22 25 8 North-east of BRW Pit, drilled as BRW 8b, Feb 2017OB093_NOL 489169.58 7775710.368 265.751 0.6 266.351 Y Y 50 12 50 7 North of NTSF, west of Processing PlantOB093_SAR 488132.35 7777268.631 250.53 0.5 251.036 Y N 9.3 6.3 9.3 9.3 North of BRW Pit, drilled as BRW 9a, Feb 2017OB094_NOL 489016.02 7772956.968 230.813 0.33 231.145 Y N 16.7 10 16 17 Beside Sandy Creek near Plumtree Creek confluence, beside farmer's wellOB094_SAR 488131.52 7777273.63 250.18 0.55 250.725 Y N 25.3 22.3 25.3 9.3 North of BRW Pit, drilled as BRW 9b, Feb 2017OB095_NOL 489636.4 7773259.147 243.54 Y 16.4 9 15 15 Between Sandy Creek and Plumtree creek (always dry)OB095_SAR 488173.41 7777356.293 247.64 0.47 248.113 Y N 6 4 6 North of BRW Pit, drilled as BRW 12, Feb 2017OB096_NOL 488670.64 7772630.955 230.639 0.25 230.887 Y N 18.54 12 18 17 South of Sandy and Plumtree Creek confluence (western side)

OB096_SAR 491378.45 7775318.171 247.24 0.29 247.539 Y N 10.5 5 10.5 8.5 Farmer's well east of upstream Sandy Creek. we029_RC Shallow, Jul 2017, paired with OB097_SAR to replace we029_RC.OB097_NOL 488923.23 7772693.222 226.923 0.51 227.417 Y N 15.51 9 15 15 South of Sandy and Plumtree Creek confluence (eastern side)

OB097_SAR 491377.45 7775313.547 247.25 0.32 247.568 Y N 50 18 50 9 Farmer's well east of upstream Sandy Creek. we029_RC Deep, Jul 2017, paired with OB096_SAR to replace we029_RC.OB098_NOL 490704.1 7772980.853 242.271 0.53 242.801 Y 19.51 9 19 7 Beside Plumtree Creek tributary (from south-east)OB098_SAR 490964.05 7775113.937 247.146 0.37 247.516 Y N 11 7 11 11 Unimpacted area behind WRDs. OB083_NOL Shallow, Jul 2017, paired with OB099_SAR to replace OB083_NOL.OB099_NOL 488964.07 7774014.653 247.9 0.47 248.37 Y Y 16.61 10 16 15 NTSF seepage down gradient of NTSF (outside fence)OB099_SAR 490965.51 7775110.114 247.119 0.4 247.519 Y N 50 35 50 11 Unimpacted area behind WRDs. OB083_NOL Deep, Jul 2017, paired with OB098_SAR to replace OB083_NOL.OB100_NOL 489533.79 7774004.235 248.786 0.44 249.226 Y Y 25.54 19 25 22 NTSF seepage down gradient of NTSF (outside fence)OB100_SAR 487969.717 7775688.67 255.489 0.664 256.153 30 18 30 11 EEN 19. NTSF down gradient. In farmers paddock.OB101_NOL 489911.84 7774219.591 247.109 0.47 247.579 Y Y 16.22 2 16 9 NTSF seepage down gradient of NTSF (outside fence)OB101_SAR 487689 7776877 242.997 0.468 243.465 37 10 37 10 EEN 25. Historic BRW area, on the track to the left just before Steve Hancock's white gate.OB101A_NOL 489914.99 7774220.313 247.512 Y N 26 10 26 NTSF seepage down gradient of NTSF (outside fence). Redrill of OB101_NOL. Jul 2017.OB102_NOL 489912.92 7774223.19 247.08 0.45 247.53 Y Y 42 11 41 9 NTSF seepage down gradient of NTSF (outside fence)OB102_SAR 488315.977 7777847.46 259.253 0.736 259.989 37 12 37 15 EEN 18. SW corner of golf course.OB103_NOL 491379.81 7776211.436 255.667 0.574 256.241 Y 11.75 3 11 11 Down gradient of SWRDOB103_SAR 488610.444 7777861.56 253.141 0.588 253.729 30 5 30 5 EEN 17. SE corner of golf course.OB104_NOL 491381.17 7776214.735 255.563 0.543 256.106 Y Y 43.59 18 43 11 Down gradient of SWRDOB104_SAR 489845.119 7777519.33 278.053 0.552 278.605 37 31 37 9 EEN 6. Drainage line in SCD compound. OB105_NOL 491364.06 7776538.429 262.439 Y 15.28 6 15.5 15.5 North-eastern corner of SWRD/South-western corner of Sandy Creek siteOB105_SAR 490215.127 7776942.85 278.825 0.362 279.187 30 17 30 22 EEN 5. Just inside Sarsfield vehicle access gate. OB106_NOL 491373.02 7776535.71 262.103 262.103 Y Y 43.27 27 43 15.5 North-eastern corner of SWRD/South-western corner of Sandy Creek siteOB106_SAR 491016.738 7776691.46 273.119 0.43 273.549 36 24 36 20 EEN 4. Inside fence N of SWRD.OB107_NOL 489641.6 7775451.52 262.103 0.57 256.324 Y 13 5 13 7.5 Kakadu seepage recoveryOB107_SAR 491756.992 7775962.97 258.657 0.368 259.025 30 23 30 11 EEN 20. Inside farmers paddock on right of Sandy Ck Rd. OB108_NOL 489008 7776006.997 277.91 N N 22 19 22 7 Nolans nursery area, top of Nolans Gully, drilled as BRW 3B, Feb 2017OB108_SAR 491852.52 7775399.39 256.802 0.142 256.944 37 9 37 10 EEN 8. W side of Sandy Ck. Second left down Plumwood Stn Rd. Past old windmill and through gate. OB109_NOL 490428.37 7775741.651 0.383 263.431 Y N 13 7 13 12 Constructed 2/8/17OB109_SAR 491081.8308 7774720.449 247.194 0.403 247.597 30 9 30 14 EEN 9. W side of Sandy Ck. Second left down Plumwood Stn Rd. before old windmill. OB110_NOL 487990.04 7774997.114 260.631 0.565 261.196 Y N 37 12 37 16 New EA compliance bore east of NTSF, constructed Feb 2017OB110_SAR 488365 7777248 256.938 0.369 257.307 Y N 25 19 25 12 Sarsfield PRP01. School St across road from GMs House. OB111_NOL 488298.88 7775188.237 258.855 0.467 259.322 Y N 37 10 31 24 NTSF seepage recovery, constructed Feb 2017OB111_SAR 487450 7776468 253.586 0.417 254.003 Y N 25 19 25 11 Sarsfield PRP02. On fenceline near Simmonds Workshop laydown entrance road.OB112_NOL 488739.96 7775554.14 272.6 0.54 273.14 Y N 26 23 26 11 N of NTSF, drilled as BRW GW2B, Feb 2017, aka OB034BOB112_SAR 487458 7775990 246.825 0.388 247.213 Y N 25 18 25 15 Sarsfield PRP03. In farmers paddock SW of Simmonds access road. Access via Simmonds rd.

OB113_NOL 488351.7 7775466.397 266.263 15 9 15NTSF seepage down gradient (outside fence). OB047_NOL Shallow, Jul 2017, paired with OB114_NOL to replace

OB047_NOL.OB113_SAR 488286 7775581 262.265 0.414 262.679 Y N 25 19 25 13 Sarsfield PRP04. In farmers paddock S of Simmonds access road. Access via Simmonds rd opposite cemetery.

OB114_NOL 488347.76 7775468.234 266.174 50 44 50NTSF seepage down gradient (outside fence). OB047_NOL Deep, Jul 2017, paired with OB113_NOL to replace

OB047_NOL.OB114_SAR 488723.7 7776832.6 257.687 0.293 257.98 Y N 24 12 24 10 Sarsfield PRP05. In NW corner of Redback paddock. Access through gate on Macrossan St.

OB115_NOL 488297.19 7775133.574 256.792 13 10 13 NTSF seepage western (outside fence). OB045_NOL Shallow, Jul 2017, paired with OB116_NOL to replace OB045_NOL.OB115_SAR 487737 7776711.3 243.977 0.253 244.23 Y N 17 9 17 10 Sarsfield PRP06. Behind BRWRD. In through farmers gate and on oppsite side of creek to farmers cattle yards.OB116_NOL 488295.5 7775130.194 256.71 50 27 50 NTSF seepage western (outside fence). OB045_NOL Deep, Jul 2017, paired with OB115_NOL to replace OB045_NOL.OB116_SAR 488135.7 7776129.5 262.304 0.454 262.758 Y N 24 18 24 13 Sarsfield PRP07. Adjacent to southern cemetery access road.

OB117_NOL 488341.55 7774377.791 250.753 24.5 15 23NTSF seepage down gradient (outside prefferential seepage path). OB046A_NOL Shallow, Jul 2017, paired with

OB118_NOL to replace OB046A_NOL.OB117_SAR 487993.7 7775877.1 258.727 0.44 259.167 Y N 27 21 27 7 Sarsfield PRP08. In farmers paddock SW of Simmonds access road. Access via Simmonds rd.

OB118_NOL 488337.33 7774379.612 250.834 50 44 50NTSF seepage down gradient (outside prefferential seepage path). OB046A_NOL Deep, Jul 2017, paired with OB117_NOL

to replace OB046A_NOL.OB118_SAR 488661.9 7777107 253.457 0.328 253.785 Y N 25 10 25 16 Sarsfield PRP09. Between creek and old blue house on John St (the back road to the church).

OB119_NOL 488966.1 7774016.139 248.342 10.6 8 10.6NTSF seepage down gradient of NTSF (outside fence). OB099_NOL Shallow, Jul 2017, paired with OB120_NOL to replace

OB099_NOL.OB119_SAR 489005 7776478 267.847 0.366 268.213 Y N 26 20 26 12 Sarsfield PRP10. Track past RO Plant towards water meter#107 over pipe follow track under powerlines

OB120_NOL 488964.97 7774018.262 248.327 50 44 50NTSF seepage down gradient of NTSF (outside fence). OB099_NOL Deep, Jul 2017, paired with OB119_NOL to replace

OB099_NOL.

OB121_NOL 489535.39 7774009.889 249.394 26 16 26NTSF seepage down gradient of NTSF (outside fence). OB100_NOL Shallow, Jul 2017, paired with OB122_NOL to replace

OB100_NOL.

OB122_NOL 489532.81 7774008.045 249.247 50 44 50NTSF seepage down gradient of NTSF (outside fence). OB100_NOL Deep, Jul 2017, paired with OB121_NOL to replace

OB100_NOL.

OB123_NOL 489012.27 7772955.819 231.244 50 36 50 Beside Sandy Creek near Plumtree Creek confluence, beside farmer's well. Jul 2017. Deep bore paired with OB094_NOL.OB124_NOL 488672.44 7772628.836 230.937 50 29 50 South of Sandy and Plumtree Creek confluence (western side). Jul 2017. Deep bore paired with OB096_NOL.OB125_NOL 488742.25 7775554.946 273.071 19 14 19 N of NTSF, Jul 2017, paired with OB112_NOL (aka OB034B).OB126_NOL 490605.86 7775198.46 257.975 0.419 258.394 30 9 30 13 Nolan's WRD operational footprint - EEN 10OB127_NOL 490495.246 7774580.428 242.24 0.338 242.578 30 18 30 30 EEN 21. Off lease Nolans Gully/strand ck. Access down Plumwood Stn Rd first left hand turn & follow fenceline. OB128_NOL 490640.44 7773986.16 245.497 0.458 245.955 30 13 30 19 S of Sandy Ck. SW of tributary - EEN 11OB129_NOL 490178.71 7772986.41 241.527 0.367 241.894 30 18 30 12 S of Plumtree Ck. Bojacks - EEN 12OB130_NOL 488802.25 7771984.44 229.342 0.336 229.678 31 14 31 15 E of Plumtree Ck. N of drainage line Bojacks - EEN 14OB131_NOL 488104.08 7771438.25 227.496 0.462 227.958 24 14 23 21 S of Plumtree Ck. SW of drainage line Bojacks - EEN 15OB132_NOL 487967.18 7771978.62 227.828 0.302 228.13 31 14 31 18 S of Plumtree Ck. SW of drainage line Bojacks - EEN 16OB133_NOL 488215.83 7773403.39 242.609 0.345 242.954 37 15 37 15 S of drainage line - EEN 13OB134_NOL 487329 7772263 241.027 0.431 241.458 Y 34 28 34 20 On left off Burdekin Falls Dam Rd. EEN COB135_NOL 487363 7770474 222.514 0.359 222.873 Y 26 12 26 13 U-turn up hill on left just after Connolly Ck crossing. EEN DOB136_NOL 491181 7773883 253.007 0.457 253.464 Y 36 30 36 16 Down Plumwood Stn Rd, turn left onto track that goes to old windmill. Turn right 150m down track. EEN FOB137_NOL 491442 7774748 254.427 0.439 254.866 Y 25 12 25 13 Down Plumwood Stn Rd, turn left onto track that goes to old windmill. Just before final ck crossing. EEN GPZ 1_NOL 489447.27 7775439.123 297.795 N N NE edge of NTSF.PZ 14_NOL 489382.1 7774922.648 297.188 0.575 297.763 Y N 34.5 6 34.5 Middle of NTSF towards East. Acess via track to left the ramp. PZ 15_NOL 488838.78 7775039.914 298.437 Y N 35.5 6 35 Middle of NTSF towards West. Access via track on Southern side of NTSF. PZ 16_NOL 488691.33 7775174.057 299.285 Y N 52 46 52 Middle of NTSF towards West. Access via track to right of NTSF ramp.PZ 17_NOL 489117.71 7774818.549 298.711 Y N 41 6 41 Southern side of NTSF just inside trees.PZ 18_NOL 489113.15 7774821.299 298.766 Y N 61 50 61 Southern side of NTSF just inside trees.PZ 19_NOL 489210.71 7775129.676 296.499 0.607 297.106 Y N 23 6 22 Middle of NTSF. Access via track to left of ramp. PZ 2_NOL 489681.13 7774789.735 297.829 N N SE edge of NTSF.PZ 20_NOL 489546.96 7775163.629 297.447 0.741 298.188 Y N 43.5 6 43.5 NE side of NTSF. Access via track on NE side.PZ 21_NOL 489483.99 7774673.769 298.628 0.651 299.279 Y N 44 20 44 SE side of NTSF. Access via track on SE side near corner.PZ 3_NOL 489501.89 7774548.004 296.873 N N SE corner of NTSF. PZ 4_NOL 488915.45 7774771.699 298.553 N N S edge of NTSF. PZ 5A_NOL 488635.57 7775060.91 298.619 N N W edge of NTSF.PZ 6_NOL 488991.31 7775220.627 298.385 N N N edge of NTSF.PZ 7_NOL 489357.62 7775067.839 299.19 N N Middle of NTSF. Access via track to left of ramp. PZ2_SAR 489551.32 7776294.329 225.299 0.499 225.798 Y N Nolans Pit, tailings bench 2 piezometerVS001_SAR 488338 7776717.003 263.787 N Y Previously BRW_VS1. Old shaft N of core shed. Caged off.VS002_SAR 488340 7776567.003 255.387 N Y Previously BRW_VS3. Old shaft S of core shed. Has pump set up on it. we028_RC 488952.63 7772952.739 230.552 0.584 231.136 N N Farmer's well beside Sandy and Plumtree Creek confluencewe029_RC 491379.68 7775303.471 247.648 N N Farmer's well east of upstream Sandy Creek



Appendix B Groundwater Inflow Observations During Drilling



Bore Area Cased Depth to Main Inflow InflowDepth Fresh Rock Depth Rate

(m) (m) (m) (L/s)

OB080_SAR Buck Reef 4 4 NA <0.1OB082_SAR Buck Reef 24.5 9 14 0.7OB084_SAR Buck Reef 20 4.5 NA DryOB086_SAR Buck Reef 24.3 8.5 15 1OB087_SAR Buck Reef 35 8.5 NA DryOB088_SAR Buck Reef 18 3 13 <0.1OB090_SAR Buck Reef 23 8.3 11 0.6OB092_SAR Buck Reef 25 8 19 0.7OB094_SAR Buck Reef 25 9.3 NA DryOB095_SAR Buck Reef 6 5 <0.1OB102_SAR Buck Reef 37 15 15 0.3OB103_SAR Buck Reef 30 5 5 0.1OB100_SAR Buck Reef 30 11 NA DryOB101_SAR Buck Reef 37 10 11 3.5OB110_SAR Buck Reef 25 16 NA DryOB111_SAR Buck Reef 25 10 NA DryOB112_SAR Buck Reef 25 20 NA DryOB114_SAR Buck Reef 24 13 12 0.3OB115_SAR Buck Reef 17 9 11 5OB116_SAR Buck Reef 24 11 NA DryOB117_SAR Buck Reef 27 14 NA DryOB118_SAR Buck Reef 25 18 10 0.1OB119_SAR Buck Reef 26 21 NA DryOB012_MTW Mt Wright 37 6 NA DryOB013_MTW Mt Wright 30 5 NA MoistOB014_MTW Mt Wright 37 6 NA DryOB015_MTW Mt Wright 30 13 NA DryOB016_MTW Mt Wright 37 12 24 0.5OB017_MTW Mt Wright 67 16 NA DryOB018_MTW Mt Wright 47 15 NA DryOB034B_NOL Nolans N 26 11 NA DryOB093_NOL Nolans N 50 7 7 0.5OB107_NOL Nolans N 13 7.5 8 1.8OB108_NOL Nolans N 22 7 NA DryOB110_NOL Nolans N 37 16 NA DryOB111_NOL Nolans N 37 24 24 0.6OB112_NOL Nolans N 26 11 No recordOB125_NOL Nolans N 19 17 NA DampOB113_NOL Nolans N 15 14.5 NA DampOB114_NOL Nolans N 50 14.5 NA DryOB115_NOL Nolans N 13 12 NA DryOB116_NOL Nolans N 50 12 28 0.1OB113_SAR Nolans N 25 13 NA DryOB070_SAR Nol plant pit 50 14 14 0.1OB126_NOL Nol plant pit 30 13 14 0.4OB105_SAR Nol plant pit 30 22 21 0.3OB106_SAR Nol plant pit 36 29 30 0.6OB071A_NOL Nol plant pit 100 13 25 0.5OB068A_NOL Nol plant pit 100 21 51 0.1OB108_NOL Nol plant pit 22 7 NA DryOB100_NOL Nolans S and E 26 22 NA <0.1OB102_NOL Nolans S and E 42 9 13 0.2OB127_NOL Nolans S and E 30 4 NA DryOB081A_NOL Nolans S and E 6 4 NA DryOB082A_NOL Nolans S and E 50 4 NA DryOB119_NOL Nolans S and E 11 9.6 NA DryOB120_NOL Nolans S and E 50 9 NA DampOB121_NOL Nolans S and E 26 25 16 0.1OB122_NOL Nolans S and E 50 25 16 0.2OB101A_NOL Nolans S and E 26 25 10 0.1OB117_NOL Nolans S and E 23 20 23 0.6OB118_NOL Nolans S and E 50 23 33 0.1



Bore Area Cased Depth to Main Inflow InflowDepth Fresh Rock Depth Rate

(m) (m) (m) (L/s)

OB089_NOL Nolans S and E 50 13 19 2.5OB091_NOL Nolans S and E 49 16 6 2OB119_NOL Nolans S and E 11 9.6 NA DryOB120_NOL Nolans S and E 50 9 18.5 DampOB121_NOL Nolans S and E 26 25 16 0.1OB122_NOL Nolans S and E 50 25 16 0.2OB127_NOL Nolans S and E 30 4 NA DryOB074_NOL Nolans S Close 64.97 15 19 5OB076_NOL Nolans S Close 53.35 13 7 0.5OB078_NOL Nolans S Close 52.7 18 18 4OB080_NOL Nolans S Close 53.16 14 5 0.5OB094_NOL Nolans S Far 16.7 17 13 0.4OB095_NOL Nolans S Far 16.4 15 NA DryOB096_NOL Nolans S Far 18.54 17 19 2.6OB097_NOL Nolans S Far 15.51 15 13 2.3OB098_NOL Nolans S Far 19.51 7 10 0.2OB128_NOL Nolans S Far 30 19 19 0.5OB129_NOL Nolans S Far 30 10 NA DryOB130_NOL Nolans S Far 31 14 18 3.3OB131_NOL Nolans S Far 23 18 17 1.3OB132_NOL Nolans S Far 37 15 20 3.8OB133_NOL Nolans S Far 37 18 18 3OB123_NOL Nolans S Far 50 17 36 0.8OB124_NOL Nolans S Far 50 22 12 3.6OB134_NOL Nolans S Far 34 20 NA DryOB135_NOL Nolans S Far 26 12 12 1OB136_NOL Nolans S Far 36 16 NA DryOB024_SC Sandy Creek 60 16 12 0.1OB025_SC Sandy Creek 43 6 16 0.1OB026_SC Sandy Creek 25 12 13 9OB027_SC Sandy Creek 25 2 10 0.1OB028_SC Sandy Creek 25 13 13 0.1OB029_SC Sandy Creek 37 6 6 <0.1OB036_SC Sandy Creek 37 13 NA DampOB037_SC Sandy Creek 37 7 8 0.3OB011A_SC Sandy Creek 24 19 12 0.2OB030_SC Sandy Creek 25 8 NA DryOB031_SC Sandy Creek 18 10 10 1OB068_SAR Sarsfield WRSF 19 5 7 4.5OB069_SAR Sarsfield WRSF 25 7 10 6OB083_NOL Sarsfield WRSF 18.71 5 5 0.2OB085_NOL Sarsfield WRSF 50.55 12 8 0.2OB087_NOL Sarsfield WRSF 37 2 14 2.6OB104_NOL Sarsfield WRSF 43.59 11 10 1.2OB106_NOL Sarsfield WRSF 43.27 15.5 14 3.4OB107_SAR Sarsfield WRSF 30 11 24 0.4OB108_SAR Sarsfield WRSF 37 7 10 0.1OB109_SAR Sarsfield WRSF 30 14 12 0.4OB096_SAR Sarsfield WRSF 10.5 10 5 2.2OB097_SAR Sarsfield WRSF 50 10 19 0.2OB098_SAR Sarsfield WRSF 11 11 7 0.1OB099_SAR Sarsfield WRSF 50 11 36 0.1OB137_NOL Sarsfield WRSF 25 13 13 0.1OB057A_SAR Suhrs Creek 27 14 23 1.5OB067_SAR Suhrs Creek 43 12 10 6OB077_SAR Suhrs Creek 5 3.5 3 0.3OB078_SAR Suhrs Creek 10 5.3 4 0.9OB079_SAR Suhrs Creek 16 8.5 8 1.7OB104_SAR Suhrs Creek 37 10 NA Dry

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