appendix e groundwater report...figure 5 production bore nppb1 – step-rate test figure 6...
TRANSCRIPT
Appendix E Groundwater Report
5 Appendix E Groundwater Report
REPORT
Hydrogeological Assessments of the North Point and Princess Louise Deposits for Mine Development - Public Environmental Review
Prepared for
Burnside Operations Pty Ltd
PO Box 195 Pine Creek NT 0847
23 February 2007
42213762
J:\Jobs \42213762\Report\R001- A.doc
Hydrog eol ogical Assessments of the North Point and Princess Louise Deposits for Mi ne Devel opment - Public Envir onmental Revi ew
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Prepared for Burnside Operations Pty Ltd, 23 February 2007 J:\Jobs\42213762\Report\R001-A.doc
Project Manager:
…………………………… Chris MacHunter Associate Hydrogeologist
Project Director:
…………………………… Richard Vogwill Senior Principal Hydrogeologist
URS Australia Pty Ltd
Level 3, Mitchell Street Darwin, NT 0801 GPO Box 2130, Darwin NT 0801 Australia Tel: 61 8 8980 2900 Fax: 61 8 8941 3920
Author:
…………………………… Chris MacHunter Associate Hydrogeologist
Date: Reference: Status:
23 February 2007 42213762 Final
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Contents
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Contents
1 Introduction ................................................................................................... 1-1
1.1 Background .................................................................................................................. 1-1
1.2 Project Location........................................................................................................... 1-1
1.3 Mine Development ....................................................................................................... 1-1
1.4 PER Guidelines ............................................................................................................ 1-1
2 Scope of Work and Proposed Approach..................................................... 2-1
2.1 Scope of Work.............................................................................................................. 2-1
2.2 Proposed Approach..................................................................................................... 2-1
2.2.1 Task 1 – Data Review, Model Conceptualisation and Liaison ...................... 2-1
2.2.2 Task 2 – Groundwater Drilling and Testing Programs .................................. 2-1
2.2.3 Task 3 - Groundwater Model Construction and Features ............................. 2-2
2.2.4 Task 4 - Groundwater Model Calibration....................................................... 2-2
2.2.5 Task 5 - Predictive Simulations – Dewatering Design, Environmental Impacts and Closure...................................................................................... 2-3
2.2.6 Task 6 – PER Groundwater Reporting.......................................................... 2-3
3 Drilling and Testing Program....................................................................... 3-1
3.1 Groundwater Drilling ................................................................................................... 3-1
3.1.1 Test Production Bores ................................................................................... 3-1
3.1.2 Groundwater Monitoring Bores...................................................................... 3-2
3.2 Bore and Aquifer Testing ............................................................................................ 3-2
3.2.1 Step-Drawdown Tests ................................................................................... 3-2
3.2.2 Constant Discharge and Recovery Tests...................................................... 3-2
4 Geology and Hydrogeology ......................................................................... 4-1
4.1 Geological Setting ....................................................................................................... 4-1
4.1.1 Regional Geology .......................................................................................... 4-1
4.1.2 Local Geology................................................................................................ 4-1
4.2 Hydrogeology............................................................................................................... 4-1
5 Groundwater Modelling Methodology......................................................... 5-1
5.1 Conceptual Hydrogeology Model............................................................................... 5-1
5.1.1 North Point..................................................................................................... 5-1
5.1.2 Princess Louise ............................................................................................. 5-1
5.2 Groundwater Flow Model Details ............................................................................... 5-1
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Contents
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5.2.1 Model Code ................................................................................................... 5-1
5.2.2 Model Domain................................................................................................ 5-1
5.2.3 Model Setup and Layering............................................................................. 5-2
5.2.4 Distribution of Hydraulic Properties ............................................................... 5-2
5.2.5 Boundary Conditions ..................................................................................... 5-2
5.2.6 Simplifying Assumptions for Modelling.......................................................... 5-3
5.2.7 Limitations of the Models............................................................................... 5-3
5.3 Model Calibration......................................................................................................... 5-4
5.3.1 Steady State Calibration................................................................................ 5-4
5.3.2 Transient Calibration ..................................................................................... 5-4
5.4 Predictive Simulations ................................................................................................ 5-4
5.5 Derived Hydraulic Parameters.................................................................................... 5-5
6 Groundwater Modelling Results .................................................................. 6-1
6.1 Estimated Dewatering Rates....................................................................................... 6-1
6.1.1 North Point..................................................................................................... 6-1
6.1.2 Princess Louise ............................................................................................. 6-1
6.2 Simulated Drawdown from Open Pit Development.................................................. 6-1
6.2.1 North Point..................................................................................................... 6-1
6.2.2 Princess Louise ............................................................................................. 6-1
6.3 Potential Impacts from Mine Dewatering .................................................................. 6-1
7 Conclusions and Recommendations .......................................................... 7-1
7.1 Conclusions.................................................................................................................. 7-1
7.2 Recommendations....................................................................................................... 7-1
8 References..................................................................................................... 8-1
9 Limitations..................................................................................................... 9-1
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Tables, Figures, Plates, Drawings Appendices
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Tabl es, Figures , Plates , Drawi ngs Appendices
Tables
Table 3-1 Bore Construction Details ................................................................................................... 3-1
Table 3-2 Constant Discharge Test Results ....................................................................................... 3-3
Table 4-1 Detailed Chemical Analyses ............................................................................................... 4-2
Table 5-1 Model Layers....................................................................................................................... 5-2
Table 5-2 Transient Calibration Results.............................................................................................. 5-4
Table 5-3 Hydraulic Parameters Derived from the Calibrated Models ............................................... 5-5
Figures
Figure 1 Regional Locality Plan
Figure 2 Sites and Surrounds
Figure 3 Bore Locations – North Point
Figure 4 Bore Locations – Princess Louise
Figure 5 Production Bore NPPB1 – Step-Rate Test
Figure 6 Production Bore PLPB1 – Step-Rate Test
Figure 7 Production Bore NPPB1 – Constant-Rate Test
Figure 8 Production Bore PLPB1 – Constant-Rate Test
Figure 9 Regional Geology
Figure 10 Model Grid – North Point
Figure 11 Model Grid – Princess Louise
Figure 12 Distribution of Hydraulic Parameters – North Point
Figure 13 Distribution of Hydraulic Parameters – Princess Louise
Figure 14 Transient Calibration – North Point
Figure 15 Transient Calibration – Princess Louise
Figure 16 Estimated Groundwater Pumpage – North Point and Princess Louise
Figure 17 Predicted Drawdown North Point – 300 Days Pumpage at 4146 kL/day
Figure 18 Predicted Drawdown North Point – 300 Days Pumpage at 425 kL/day
Figure 19 Predicted Extent of Drawdown – 300 Days Error! No tab le of figures entries found. Error! No tab le of figures entries found.
Appendices
A. Bore Completion Diagrams
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 1 Introduction
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1 Introduction
1.1 Background
Burnside Operations Pty Ltd (BOPL) plan to commence mining operations at North Point and Princess Louise deposits. Prior to mine development, a Public Environmental Review (PER) is required to obtain regulatory approval for the mines.
BOPL, as part of the project PER, requires an assessment of the environmental impacts of groundwater level lowering (drawdown) near the proposed mines, caused by pit dewatering.
To satisfy the guidelines for the PER, hydrogeological investigations comprised:
(i) the installation of test production bores (for aquifer testing) and groundwater monitoring bores at North Point and Princess Louise deposits; and
(ii) predictive groundwater flow modelling.
BOPL engaged URS Australia Pty Ltd (URS) to complete these assessments, as described in URS proposal 03036133, dated 6 September 2006.
1.2 Project Location
The Princess Louise and North Point deposits are located approximately 170 km southeast of Darwin and about 12 km northeast of Hayes Creek (Figure 1). This area occurs within the Burnside Project Area (BPA), a collection of mine sites all owned and operated by BOPL, and described as the area within a 30 km radius of the Brocks Creek Mine Site (Figure 2).
1.3 Mine Development
The proposed mine developments comprise conventional staged open pits, mined by a fleet of conventional rope shovels, hydraulic excavators and large haul trucks.
The proposed gold mining operations at Princess Louise and North Point mine sites are relatively small scale and short term, with the two open pit operations proposed to be completed within approximately 4 months.
It is anticipated that the Princess Louise pit will extend to approximately 35 m depth and produce 112,638 t of ore, while the North Point pit will be 25 m deep with 323,024 t ore extracted. Mining will intersect the water table at both sites and therefore pit dewatering will be required to ensure relatively dry and efficient mining.
1.4 PER Guidelines
Based on the Northern Territory EPA guidelines for the North Point and Princess Louise PER, the hydrogeological components of the PER need to include the following:
• Description of the site and the regional groundwater systems;
• Discuss the existing uses, beneficial uses and quality;
• Describe the impacts associated with mining and pit dewatering on groundwater; and
• Management of groundwater and groundwater monitoring.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 2 Scope of Work and Proposed Approach
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2 Scope of Work and Proposed Approach
2.1 Scope of Work
The scope of work for this project was outlined in URS proposal 03036133 and is summarised below.
• Data Review, Model Conceptualisation and Liaison;
• Groundwater Drilling and Testing Programs;
• Groundwater Model Construction and Features;
• Groundwater Model Calibration;
• Predictive Simulations – Dewatering and Environmental Impacts, and
• PER Groundwater Model Reporting.
2.2 Proposed Approach
The proposed approach (as described in our proposal) to complete the scope of work is outlined below.
2.2.1 Task 1 – Data Review, Model Conceptualisation and Liaison
In order to form a conceptual model of the mining areas and surrounding region, it will be necessary to review geological and hydrogeological data. Additional information is required for the local stratigraphy and hydrogeological parameters.
We will liaise with BOPL geologists to ensure that we fully understand the geology of the deposits and then form a conceptual groundwater model of each deposit prior to commencing model construction. This would require a visit to the Brocks Creek site office to review existing datasets and log core.
2.2.2 Task 2 – Groundwater Drilling and Testing Programs
Based on our conceptual model and known geology, we will design and complete a program of groundwater drilling and testing to assist in preliminary dewatering design and allow the quantification of environmental impacts.
Based on our hydrogeological interpretation, we will locate prospective groundwater targets and specify bore drilling methods and locations. One aquifer test bore will be located at each prospect, located outside the pit perimeter at each deposit if suitable data are available. Most of these locations will be sited in order that successful bores can be used for dewatering. Groundwater monitoring bores will also be constructed to measure groundwater quality down-gradient of the mine and will be used during aquifer testing to determine aquifer parameters.
Our hydrogeologists will visit site during the groundwater drilling and testing programs and liaise often with BOPL during the programs.
Our proposed field activities comprise the following groundwater exploration and testing programmes for PER completion.
North Point
• One test dewatering bore located outside the pit perimeter if available data allow this.
• Two groundwater monitoring bores to assist in the determination of aquifer properties through aquifer testing of production bores. We would locate these bores in long-term positions suitable for inclusion in a groundwater monitoring network.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 2 Scope of Work and Proposed Approach
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• Completion of aquifer tests and collection of groundwater samples for analysis.
Princess Louise
• One test dewatering bore located outside the pit perimeter if available data allow this.
• Two groundwater monitoring bores to assist in the determination of aquifer properties through aquifer testing of production bores. We would locate these bores in long-term positions suitable for inclusion in a groundwater monitoring network.
• Completion of aquifer tests and collection of groundwater samples for analysis.
2.2.3 Task 3 - Groundwater Model Construction and Features
Our proposed model will be constructed using commercially available software such as Visual MODFLOW (finite-difference). URS proposes to use MODFLOW-SURFACT with Visual MODFLOW Pro Version 4 as the pre- and post-processors. MODFLOW-SURFACT contains several flow packages which complement/supplement the widely used USGS MODFLOW by enhancing the schemes for performing unconfined simulations to rigorously model desaturation/resaturation of aquifers.
The modelled area will be discretised into different material types and layers in order to simulate the interpreted geology and hydrogeology as closely as possible. The model will take into account such features as:
• The geometry and properties of known aquifer systems;
• The geology and structural geology of the site and the impact of these structures on groundwater flow;
• The layout of the mining areas and the proposed open-pits;
• The relationship between groundwater and surface water – both flows and levels, and
• Groundwater and surface water recharge-discharge mechanisms.
The model will be designed to incorporate additional groundwater drilling and testing information as it becomes available and this will lead to gradual model refinement as the mining operations commence. In this manner, the model can be used to refine, predict and quantify the required dewatering system for mining and also the potential environmental impacts associated with dewatering.
2.2.4 Task 4 - Groundwater Model Calibration
The calibration of the model will occur in two steps:
• Steady-State – during this calibration stage, groundwater levels generated by the model will be
matched to known groundwater levels and flow directions across the mining region. This will be
achieved by small variations in model parameters, especially hydraulic parameters such as
permeability and storativity. A successful steady-state calibration is a necessary precursor to the next
stage of model development.
• Transient – this is the most difficult and time-consuming stage of model calibration. During this work,
known aquifer response to pumping by bores is matched by simulating this pumping in the model.
This can be difficult to achieve. Model parameters are varied until a satisfactory drawdown response
to actual pumping is achieved. The model is then ready to be used for predictive simulations to
forecast available groundwater supply and assess potential environmental impacts.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 2 Scope of Work and Proposed Approach
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2.2.5 Task 5 - Predictive Simulations – Dewatering Design, Environmental Impacts and Closure
2.2.5.1 Preliminary Pit Dewatering Design
The calibrated model will be used to calculate groundwater inflows to the pits. These inflows will give a preliminary indication of the amount of groundwater that has to be pumped to maintain efficient and relatively dry mining conditions. These results can be used to describe the required dewatering system for each pit.
Once the necessary abstraction rates have been established, these rates will used to simulate pit dewatering and determine the regional drawdown of the water table around the mining area.
2.2.5.2 Environmental Impacts
The main potential groundwater-related environmental impacts resulting from the proposed mining are associated with groundwater level lowering near the pits. Groundwater lowering may result in vegetation stress, and have impacts on the ecological water requirements that are needed to sustain flora and fauna associated with drainages of the area.
The model will be constructed to simulate the interaction of groundwater and surface water in the major drainages of the area. Specialised model cells, which represent potential points of leakage from surface water to groundwater, will be included in the model. These cells will occur in drainages, and floodplains of these drainages. This will allow modelled leakage to occur during wet season.
Drawdown predictions from the groundwater modelling will be used to evaluate the impacts of pit dewatering. Thus, the groundwater/surface water modelling will allow a quantification of environmental impacts and therefore assist in planning the mitigation of such impacts. This will be an important aspect of regulatory approval for the proposed mine development.
2.2.5.3 Mine Closure
We consider the development of a groundwater model to also be important in mine closure planning. As with environmental impacts, studies of final void water levels will be an important aspect of obtaining regulatory approval for the mine development.
2.2.6 Task 6 – PER Groundwater Reporting
The report will describe the field program completed, the hydrogeology of the mining area, the conceptual hydrogeological model for each deposit, the modelling results at the PER stage (dewatering and closure) and will also describe the potential environmental impacts associated with groundwater abstraction for pit dewatering. Results from this report can be directly imported into the PER document or be presented as an Appendix.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 3 Drilling and Testing Program
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3 Drill ing and Testing Program
3.1 Groundwater Drilling
One test production bore and 2 groundwater monitoring bores were installed at the North Point and Princess Louise deposits (Figures 3 and 4) during December 2006 and January 2007. Drilling was completed by Bores NT with a truck-mounted drilling rig using air-hammer methods.
A 146 mm diameter pilot hole was drilled at each location. All holes were lithologically logged and sampled.
Bore construction details are summarised in Table 1 and discussed below.
Table 3-1 Bore Construction Details
Mine Grid MGA Bore
Easting Northing RL Easting Northing RL Depth (m)
Screened Interval (mbgl)
Groundwater Depth (mbtoc)
North Point
NPPB1 9646.63 9974.06 1112.67 8507303.87 775723.03 112.67 61 25-61 14.18
NPMB1 9734.50 9990.09 1113.22 8507391.73 775738.83 113.22 61 55-61 14.70
NPMB2 9403.15 10031.47 1123.36 8507060.67 775781.01 123.36 67 62-67 24.26
Princess Louise
PLPB1 9746 7100 - 8504750.83 775495.74 - 78 22-78 26.60
PLMB1 7092.82 9740.30 1146.06 - - 114.6 73 67-73 22.37
PLMB2 9694 6950 - - - - 66 60-66 16.10
Notes: mbgl = metres below ground level mbtoc = metres below top of collar
Bore logs, showing descriptions of strata and graphical well construction details, are presented in Appendix A.
3.1.1 Test Production Bores
3.1.1.1 North Point
One test production bore (NPPB1, Figure 3) was constructed and cased with 203 mm internal diameter casing and slotted steel bore screens.
The bore was drilled using air-hammer techniques and encountered fractured greywacke and tuff between the depths 24-28, 40-42, 47-48, 54-56 and 60-61.
Bore development was by air-lifting and surging, using compressed air to force groundwater into and out of the screened section, and discharge groundwater from the bore. The bore was developed by this method until silt-free groundwater returns were obtained.
3.1.1.2 Princess Louise
One test production bore (PLPW1, Figure 4) was constructed and cased with 203 mm internal diameter casing and slotted steel bore screens.
The bore was drilled using air-hammer techniques and encountered fractured greywacke and tuff between the depths 36-37m and 59-59m.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 3 Drilling and Testing Program
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Bore development was by air-lifting and surging, using compressed air to force groundwater into and out of the screened section, and discharge groundwater from the bore. The bore was developed by this method until silt-free groundwater returns were obtained.
3.1.2 Groundwater Monitoring Bores
Two groundwater monitoring bores were drilled at each deposit and constructed using 50 mm nominal diameter uPVC casing. Machine-slotted uPVC casing (1 mm aperture slots) was used for the screened section. Details of the bore constructions are presented in Appendix A.
3.1.2.1 North Point
Two groundwater monitoring bores were installed at North Point (NPMW1 and 2, Figure 3) to assist with the determination of groundwater drawdown response from aquifer testing. The bores intersected siltstone, mudstone and greywacke.
3.1.2.2 Princess Louise
Two monitoring bores were installed at Princess Louise (PLMW1 and 2, Figure 4) to assist with the determination of groundwater drawdown response from aquifer testing. Both bores intersected siltstone, mudstone and greywacke.
3.2 Bore and Aquifer Testing
A program of bore and aquifer testing was completed in each of the test production bores to determine bore and aquifer properties.
Three types of tests were undertaken:
• Step-drawdown tests;
• Constant-discharge tests; and
• Recovery tests.
3.2.1 Step-Drawdown Tests
The step-drawdown tests were used to determine bore pumping characteristics and estimate a pumping rate suitable for the constant-discharge test. These tests comprised pumping the bore at rates that were increased incrementally (“steps”). The steps were generally of 60 minutes duration. Analyses of these results were used to determine well and formation loss factors and to select a suitable rate for the constant -discharge test.
Plots of the step-rate tests for North Point and Princess Louise are presented in Figures 5 and 6.
3.2.2 Constant Discharge and Recovery Tests
The constant-discharge test in each production bore was commenced following the step-drawdown test and after groundwater levels had recovered to near-initial static levels. Upon completion of each constant-discharge test, recovering groundwater levels were also measured and analysed.
The test pumping was undertaken by the drilling contractors using electric submersible pumps. Pumping rates were measured through an orifice weir. Electric contact meters (dip meters) were used to measure groundwater levels in both the pumped bore and the groundwater monitoring bores.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 3 Drilling and Testing Program
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The constant-discharge test results enable the hydraulic characteristics of the aquifers intersected by each test production bore to be determined. These parameters quantify the storage and transmission of groundwater in the aquifer.
The results of the constant-rate tests and the calculated hydraulic parameters are shown on Table 3-2, with drawdown plots presented in Figures 7 and 8.
Table 3-2 Constant Discharge Test Results
Observation Bores Transmissivity (m2/day) Storativity
Pumping Bore
Date of Test
Pumping Rate
(kL/day)
Final Drawdown
(m) Bore No Dist. (m)
Theis Cooper-Jacob
(-)
North Point
NPPB1 (e) 500 -
NPPB1 (l) 0
100 -
NPMB1 (e) 430 3E-05
NPMB1 (l) 243
115 4E-04
NPMB2 (e) 740 1E-04
NPPB1 22/1/2007 1,640 5.44
NPMB2 (l) 332
100 110 5E-04
Princess Louise
PLPB1 (r) 0 35 -
PLMB1 (l) 20 22 5E-06
PLMB1 (r) 70
190 -
PLMB2 (l) 20 21 1E-03
PLPB1 18/1/2007 490 9.97
PLMB2 (r) 92
150 -
Notes: (e) – Early Time (l) – Late Time (r) – Recovery
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 4 Geology and Hydrogeology
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4 Geo logy and Hydrogeology
4.1 Geological Setting
4.1.1 Regional Geology
Previous mining operations in the vicinity of the project area have extracted gold, tin and the base metals, lead, zinc and copper. Gold mineralisation occurs in all units of the South Alligator Group and Burrell Creek Formation (Figure 9); a sequence of regionally metamorphosed greenschist facies, fine grained volcano-metasedimentary and mafic intrusive rocks. All gold prospects are associated with regional anticlinal structures that trend around the Burnside Granite pluton, in the core of the project area.
The largest gold deposits are located on the Howley Anticline, which hosts a series of deposits along its length and which has been the major source of gold in this area. Significant gold deposits have also been discovered and periodically mined over the last century in the East Burnside area. These prospects are hosted within large anticline structures and are spatially related to the regional northwest striking Pine Creek Shear Zone, which trends northwest between the Burnside and Margaret Granite plutons (BOPL, 2006).
4.1.2 Local Geology
The North Point and Princess Louise Deposits are hosted within the Mount Bonnie Formation of the South Alligator Group that comprises of a sequence of shale, mudstone, phyllite, siltstone, feldspathic greywacke and minor tuffaceous chert, tuff, argillite with rare banded iron formation and dolomite.
Gold mineralisation at the North Point and Princess Louise deposits is associated with quartz veining and centralised shear zones, located on the western limb of a north-south trending anticline. Both the North Point and Princess Louise deposits are located within the northwest-trending Pine Creek Shear Zone that forms part of a wrench fault system (NTGS, 1993).
4.2 Hydrogeology
Aquifers at North Point and Princess Louise occur primarily (from surface) within fractured greywacke, vuggy quartz veining and weathered greywacke and tuff in the bedrock. The most significant aquifer occurs within greywacke, which appears to have a moderate permeability at Princess Louise and high permeability at North Point.
Faults and shear zones that intersect the deposits also probably transmissive and will contribute groundwater inflow to the proposed pits where they intersect the walls.
Groundwater levels are relatively flat at both deposits with slight increases associated with topography. North Point groundwater levels are approximately 14 metres below ground surface and between 16 and 26 metres below ground surface at Princess Louise, depending on the topography.
Groundwater within each of the prospects is fresh with total dissolved solids ranging between 130 and 210 mg/L, and elevated iron and arsenic concentrations, especially at the North Point deposit. Groundwater is not considered potable at either site as it exceeds NHMRC Drinking water guidelines for arsenic of 0.007 mg/L (0.392 mg/L North Point, 0.053 mg/L Princess Louise) and aesthetic iron values of 0.3 mg/L (0.48 mg/L, North Point).
Detailed chemical analyses are presented in Table 4-1.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 4 Geology and Hydrogeology
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Table 4-1 Detailed Chemical Analyses
Analyte Unit NPPB1 PLPB1
pH pH Unit 6.43 7.09
TDS mg/L 132 206
Hydroxide Alkalinity as CaCO3
mg/L <1 <1
Carbonate Alkalinity as CaCO3
mg/L <1 <1
Bicarbonate Alkalinity as CaCO3
mg/L 67 101
Total Alkalinity as CaCO3
mg/L 67 101
Sulphate as SO4 2- mg/L 14 7
Sulphur as S mg/L 5 2
Chloride mg/L 2.1 10.2
Calcium mg/L 4 3
Magnesium mg/L 11 19
Sodium mg/L 12 17
Potassium mg/L 3 4
Arsenic (dissolved) mg/L 0.392 0.053
Cadmium (dissolved)
mg/L 0.0002 <0.0001
Chromium (dissolved)
mg/L <0.001 <0.001
Copper (dissolved) mg/L <0.001 <0.001
Lead (dissolved) mg/L <0.001 <0.001
Nickel (dissolved) mg/L <0.001 <0.001
Zinc (dissolved) mg/L 0.017 0.012
Iron (dissolved) mg/L 0.48 0.29
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 5 Groundwater Modelling Methodology
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5 Groundwat er Modelling Methodology
5.1 Conceptual Hydrogeology Model
Interpretations of conceptual hydrogeology models for North Point and Princess Louise pits are described below.
5.1.1 North Point
• The local groundwater flow direction is towards the north-west and regionally towards the north, following topography and the associated drainages to the north.
• Groundwater levels are generally 14 metres below ground surface.
• Surficial cover is generally thin or non-existent near the pit and does not contain significant aquifer zones.
• The bedrock comprises a 25 metre wide shear/fracture zone through the pit, associated with the mineralisation and vuggy quartz fracturing.
• The bedrock weathering profile deepens in the vicinity of the pit, associated with the shear zone.
• The detailed geology beyond the mining area is generally unknown. Therefore, the modelled geology in regional areas is based on large-scale mapping.
5.1.2 Princess Louise
• The deposit is located on a groundwater divide and local groundwater flow direction is to the south west and regionally towards the north, following topography and associated drainages to the north.
• Groundwater levels are generally 25 metres below ground surface, depending on topography.
• Surficial cover is generally thin or non-existent in the vicinity of the pit and does not contain significant aquifer zones.
• The bedrock comprises a 15 metre wide shear/fracture zone though the pit, associated with the mineralisation and vuggy quartz fracturing.
• The weathering profile deepens throughout the pit area, associated with the shear zones.
• The detailed geology beyond the mining area is generally unknown. Therefore, the modelled geology in regional areas is based on large-scale mapping.
5.2 Groundwater Flow Model Details
5.2.1 Model Code
The model code selected was MODFLOW. MODFLOW is a three-dimensional block-centred finite-difference code developed by the USGS to simulate groundwater flow in the saturated subsurface. Visual MODFLOW Pro Version 4 was used as the pre- and post-processors.
5.2.2 Model Domain
5.2.2.1 North Point
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 5 Groundwater Modelling Methodology
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The model domain measures 2 km east-west and 2 km north-south (Figure 10), and was discretised into 6512 model cells (88 columns x 74 rows x 2 layers) with variable grid sizes. Each cell block represents a homogeneous hydrogeologic sub-unit of the hydrostratigraphic unit. Finer grids (6.5 m x 10 m) were used around the proposed open-pit and in areas of specific interest (Figure 10).
5.2.2.2 Princess Louise
The model domain measures 5.5 km east-west and 6 km north-south (Figure 11), and was discretised into 12412 model cells (107 columns x 116 rows x 2 layers) with variable grid sizes. Each cell block represents a homogeneous hydrogeologic sub-unit of the hydrostratigraphic unit. Finer grids (5 m x 5 m) were used around the proposed open-pit and in areas of specific interest.
5.2.3 Model Setup and Layering
In order to capture the regional and local flow of groundwater and physical changes caused by mining, the numerical models were designed to include the groundwater flow domains. Two layers identified in the conceptual model, were modelled as individual layers (Table 5-1).
Table 5-1 Model Layers
Layer Descriptions
North Point
1 Weathered Bedrock/Weathered Shear
2 Bedrock/Fresh Shear
Princess Louise
1 Weathered Bedrock/Weathered shear
2 Bedrock/Fresh Shear
5.2.4 Distribution of Hydraulic Properties
Uniform hydraulic conductivities (permeabilities) were assigned to layers 1 and 2, but were sub-zoned, based on the interpreted distributions of: (i) weathered bedrock; (ii) shear/fracture units. Figure 12 shows the distribution of permeability in the model for North Point and Figure 13 shows the distribution for Princess Louise.
For all shear/fracture units modelled, the horizontal permeability was made anisotropic (Ky, north-south ≠ Kx, east-west).
5.2.5 Boundary Conditions
Since the presence of physical boundaries to groundwater flow within the model domain is largely unknown, the hydraulic boundaries were arbitrarily selected at the model perimeter, a significant distance from the areas where groundwater is removed from the model to simulate open-pit dewatering.
No recharge has been defined, as the mining is planned during the dry season at both deposits.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 5 Groundwater Modelling Methodology
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To simulate groundwater abstraction for pit dewatering, production bores were used in each model. Scheduling the flow rates and the number of bores at each pit allowed for the determination of dewatering rates.
5.2.6 Simplifying Assumptions for Modelling
Simplifying assumptions were made in order to discretise the groundwater flow conditions into a manageable package, without sacrificing the ability to simulate features which significantly contribute to the groundwater flow regime. The assumptions used are summarised below:
Aquifer Base
The bedrock below -500 mRL (North Point) and -100 mRL (Princess Louise) does not yield water and is impermeable to groundwater flow.
Top of Model
The top of the model is the current topography (Figures 3 and 4), with the uppermost layer being unconfined.
Hydraulic Parameters and Material Types
• The calibrated hydraulic parameters are representative beyond the calibrated domain of the model;
• The permeability zoning, which is based on the published bedrock geology of the area, broadly represents the hydrogeology; and
• Only major shear and permeable fracture zones of weathered bedrock are represented in the model. In general, the fresh bedrock in the mine area has a small permeability and contains limited aquifers.
Mine Development
The mining schedule for both deposits is equally sub-divided into monthly schedules.
Model Code
MODFLOW is a groundwater flow model code for fully saturated conditions. Hydraulic conductivity does not change with the change in water content. The reduction in hydraulic conductivity in unsaturated conditions is approximated by correcting the transmissivity for changes in the saturated thickness.
5.2.7 Limitations of the Models
The developed groundwater flow model has limitations. These limitations result from generalisations, interpretations and assumptions made in attempting to simulate the interpreted hydrogeology. The model limitations include:
• MODFLOW is a fully saturated groundwater flow model code, which can lead to an overestimation of the dewatered areas;
• The area occurs within a fractured rock environment, where the only major aquifers in the bedrock are secondary structures, such as faults and shear zones in the weathered zones. The models only represent the major secondary structures (faults and shear zones) in the area; and
• The limited data surrounding the deposits and the complexities of the hydrogeological regime mean that these models should only be used as a guide to determine impact areas and the likely groundwater abstraction rates required for dewatering. The interpretation of predictive simulations should be based on the assumptions made.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 5 Groundwater Modelling Methodology
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5.3 Model Calibration
Model calibration is used to establish that the model can reproduce measured groundwater levels and flows, both regionally and during aquifer tests.
Calibration of the model occurs in two steps and these are described below.
5.3.1 Steady State Calibration
A steady state calibration was completed by:
• Assigning estimated hydraulic properties to the various material types in the model;
• Assigning assumed groundwater levels to the model boundaries, based on topography and known groundwater levels in the modelled area; and
• Running the model under current known hydraulic conditions for an infinite time (i.e., steady-state) to establish the regional groundwater flow gradient, flow pattern and groundwater elevations in the area.
• For both North Point and Princess Louise, a flat groundwater table was applied.
5.3.2 Transient Calibration
The groundwater elevations resulting from the steady-state calibration were used as initial conditions for all transient simulations.
During the transient calibration process, the hydraulic parameters were varied in order to get the best fit of modelled drawdown to the actual drawdown measured in observation bores during aquifer tests. The transient calibration was repeated for each of the aquifer tests (North Point and Princess Louise) in the test production bores with simulated groundwater levels tracked at the observation bore locations.
Steady state calibration is presented in Figures 14 and 15 and Table 5-2 shows that observed and simulated groundwater levels are comparable for North Point and Princess Louise.
Table 5-2 Transient Calibration Results
Observation Bore Observed Drawdown (m) Simulated Drawdown (m)
North Point
NPMB1 3.43 3.42
NPMB2 2.82 2.84
Princess Louise
PLMB1 4.62 4.51
PLMB2 4.40 4.56
5.4 Predictive Simulations
With the calibrated model, simulations of the open-pit dewatering system were completed to help assess the potential impacts of dewatering on regional groundwater levels and the hydrological environment and to determine the pit dewatering requirements.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 5 Groundwater Modelling Methodology
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In order to model the dewatering of the open-pit and to assess the environmental impacts, the model was run in transient mode, with bores used to simulate the dewatering requirements, based on the mining schedules (elevation versus time).
The dewatering scenarios investigated used a staged mining schedule (BOPL, 2005), in order to quantify dewatering rates in line with proposed mining schedule.
Dewatering bores were placed along the shear/fracture zones to simulate groundwater abstraction from each pit. Dewatering rates of each bore were varied in order to achieve the drawdown required during the mining schedule at each deposit.
5.5 Derived Hydraulic Parameters
One hundred transient calibration runs were completed at North Point in order to match simulated aquifer test drawdown to actual. A total of thirty five transient calibration runs where completed at Princess Louise. Table 5-3 summarises the hydraulic parameters derived from the calibrated models that broadly correspond with the values derived from the aquifer tests.
Table 5-3 Hydraulic Parameters Derived from the Calibrated Models
Hydraulic Conductivity
(Permeability) Material Type
Model Layer
Descriptions
Kx Ky Kz
Specific Storage
Specific Yield
(m/d) (m/d) (m/d) (1/m) (-)
North Point
1 1 Weathered Bedrock 5 5 1 2E-04 0.05
2 1 Weathered Shear 20 60 20 5E-04 0.1
3 2 Fresh Shear 20 60 20 1E-05 0.015
4 2 Bedrock 0.01 0.01 0.001 5E-06 0.007
Princess Louise
1 1 Weathered Bedrock 0.5 0.5 0.05 5E-05 0.004
2 1 Weathered Shear 10 20 10 6E-05 0.1
3 2 Fresh Shear 2.5 4 1.4 6E-06 0.01
4 2 Bedrock 0.01 0.01 0.001 1E-06 0.001
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 6 Groundwater Modelling Results
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6 Groundwat er Modelling Results
6.1 Estimated Dewatering Rates
Estimated dewatering rates for the North Point and Princess Louise deposits are presented in Figure 16. The rates have been estimated for both deposits using the completed depths of mining after four months, and by comparing this to the simulated drawdown observed (Section 6.3). Each production bore simulated was screened to at least 5 metres below the anticipated depth of mining.
6.1.1 North Point
Three production bores was used to simulate the required drawdown based on the mining schedule at North Point. Each bore was pumped at a rate of 692 kL/day (8 L/sec) for 120 days (4 months).
The estimated dewatering rates at North Point are 2,074 kL/day (24 L/sec), sustained throughout the anticipated mining duration of 3 months with a one month lead time prior to mining.
The long-term dewatering rates will decrease as the aquifer interval is progressively dewatered.
6.1.2 Princess Louise
One production bore was used to simulate the required drawdown based on the mining schedule at Princess Louise. The bore was initially pumped at 425 kL/day (4.9 L/sec), sustained throughout the anticipated mining duration of 3 months with a one month lead time prior to mining.
The long-term dewatering rates will decrease as the aquifer interval is progressively dewatered.
6.2 Simulated Drawdown from Open Pit Development
Figures 17 and 18 show the simulated extent of drawdown for North Point and Princess Louise after 120 days (4 months) of groundwater abstraction at the anticipated dewatering rates (Section 6.1).
6.2.1 North Point
The extent of drawdown after 4 months of abstraction at 2,074 kL/day from three production bores indicated 1 metre reductions in groundwater level between 680 and 810 m to the north and south of the planned pit, and between 360 and 425 m to the east and west. Most of the abstraction will occur from within the shear zone, weathered bedrock and permeable zones within the bedrock. By the end of mining, the groundwater level within the pit will be 15 m below the original static groundwater level or approximately 30 m below ground level.
6.2.2 Princess Louise
The extent of drawdown after 4 months of pumpage at 425 kL/day from one production bore indicated 1 metre reductions in groundwater level between 1.1 km and 2.1 km to the north and south of the planned pit, and between 700 m and 720 m to the east and west. Most of the abstraction will occur from within the shear zone, weathered bedrock and permeable zones within the bedrock.
6.3 Potential Impacts from Mine Dewatering
Based on the simulated drawdown in the groundwater modelling, bedrock/shear zone groundwater levels will be lowered in the immediate area of the open pits because of the groundwater abstraction required for mine dewatering.
Groundwater lowering associated with dewatering of the proposed pits can cause drawdown in groundwater supply bores/stock wells if these are in close proximity to the proposed pits. Based on
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 6 Groundwater Modelling Results
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current knowledge, no existing users are located within the predicted cone of depression for both North Point and Princess Louise.
Groundwater lowering associated with dewatering of the proposed pits can also impact:
• Groundwater dependent ecosystems (GDEs) such as wetlands and swamps, features that are largely supported by groundwater and the position of the water table. We are unaware of any such features near the mining developments.
• Stream flows in surface drainages, although most of the pit dewatering will occur during the dry season, when such drainages are dry.
Our preliminary assessment indicates that dewatering of the two open-pits will have little impact on the groundwater resources of the region or features that are supported by groundwater. Both of these mining developments require only minor dewatering for a relatively short period of time, which will minimise potential impacts on groundwater.
The proponent will incorporate the existing groundwater monitoring bores into a groundwater monitoring system to ensure that any groundwater-related impacts are recognised and can therefore be mitigated.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 7 Conclusions and Recommendations
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7 Conclusions and Recommendations
Based on the results of the drilling and testing programmes and groundwater modelling, the following conclusions and recommendations are summarised below.
7.1 Conclusions
• Drilling and testing programmes were undertaken at both North Point and Princess Louise deposits to assist with pit dewatering design and predict groundwater drawdown associated with dewatering, through the use of a groundwater flow model.
• The hydrogeology away from the mining areas is generally unknown. The regional hydrogeology is based on regional geological maps and structures, but the groundwater model does not take all of these into account.
• The modelled areas occur in a fractured rock environment. As such, the occurrence of aquifers is structurally controlled and quite complex. We feel that the main aquifers in each deposit comprise a central shear zone in both the weathered and fresh bedrock zones. Away from the central shears we believe that only minor aquifers occur and these are mainly located in the weathered zone.
• As a result, the groundwater models are approximate but can be used to assess order of magnitude variations in groundwater level as a result of pit dewatering and the required abstraction rates to meet dewatering requirements. Calibration of both models is only based on one pumping test at each deposit.
• No wetlands or swamps are present in the vicinity the drawdown predicted by the modelling.
• Dewatering will occur during the dry season when streams in proximity to the pits are not flowing.
• Dewatering discharge at Princess Louise is to be used for dust suppression purposes during the life of mining. Water quality is fresh, however the groundwater is slightly elevated in arsenic and iron concentrations.
• Due to the dewatering rates required at North Point, not all of the dewatering discharge can be used for dust suppression. Therefore, other water disposal options will need to be considered, such as evaporation ponds or irrigation. Water quality is fresh, however the groundwater has elevated arsenic concentrations and slightly elevated iron concentrations.
7.2 Recommendations
• Due to the likely excessive water requirements at North Point, the preferred water disposal options need to be determined.
• Incorporate the existing monitoring and production bores at the deposits into a groundwater monitoring programme and monitor throughout the life of the mining.
• As part of licensing requirements, it will probably be necessary to regularly monitor the performance of the dewatering systems (abstraction rates, groundwater levels) and the groundwater monitoring network for environmental reasons. This monitoring is recommended because it will also be advantageous to maintain relatively dry and efficient mining conditions by optimising dewatering system performance.
• At this stage, the design of the dewatering systems is preliminary. As mining schedules and mine designs become more definitive, it is recommended that the dewatering designs are refined.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 8 References
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8 References
Burnside Operation Pty Ltd (BOPL) (2006), Mine Management Plan – Cosmo Project Area, July 2006
Burnside Operations Pty Ltd (BOPL) (2005), Brocks Creek and Cosmo Open Pit Mining Study April 2005.
Northern Territory Geological Survey (NTGS), (2006), Pine Creek SD 52-8, Metallogenic Map Series Explanatory Notes and Mineral Deposit Data Sheets, Department of Mines and Energy, Northern Territory Government, 1993.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Section 9 Limitations
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9 Limit ations
URS Australia Pty Ltd (URS) has prepared this report in accordance with the usual care and thoroughness of the consulting profession for the use of GBS Australia Pty Ltd and only those third parties who have been authorised in writing by URS to rely on the report. It is based on generally accepted practices and standards at the time it was prepared. No other warranty, expressed or implied, is made as to the professional advice included in this report. It is prepared in accordance with the scope of work and for the purpose outlined in the Proposal dated 6 September 2006 (3036133).
The methodology adopted and sources of information used by URS are outlined in this report. URS has made no independent verification of this information beyond the agreed scope of works and URS assumes no responsibility for any inaccuracies or omissions. No indications were found during our investigations that information contained in this report as provided to URS was false.
This report was prepared between 22 January 2007 and 23 February 2007 and is based on the conditions encountered and information reviewed at the time of preparation. URS disclaims responsibility for any changes that may have occurred after this time.
This report should be read in full. No responsibility is accepted for use of any part of this report in any other context or for any other purpose or by third parties. This report does not purport to give legal advice. Legal advice can only be given by qualified legal practitioners.
This report contains information obtained by inspection, sampling, testing or other means of investigation. This information is directly relevant only to the points in the ground where they were obtained at the time of the assessment. The borehole logs indicate the inferred ground conditions only at the specific locations tested. The precision with which conditions are indicated depends largely on the frequency and method of sampling, and the uniformity of conditions as constrained by the project budget limitations. The behaviour of groundwater and some aspects of contaminants in soil and groundwater are complex. Our conclusions are based upon the analytical data presented in this report and our experience. Future advances in regard to the understanding of chemicals and their behaviour, and changes in regulations affecting their management, could impact on our conclusions and recommendations regarding their potential presence on this site.
Where conditions encountered at the site are subsequently found to differ significantly from those anticipated in this report, URS must be notified of any such findings and be provided with an opportunity to review the recommendations of this report.
Whilst to the best of our knowledge information contained in this report is accurate at the date of issue, subsurface conditions, including groundwater levels can change in a limited time. Therefore this document and the information contained herein should only be regarded as valid at the time of the investigation unless otherwise explicitly stated in this report.
H Y D R O G E O L O G I C A L A S S E S S M E N T S O F T H E N O R T H P O I N T A N D P R I N C E S S L O U I S E D E P O S I T S F O R M I N E D E V E L O P M E N T - P U B L I C E N V I R O N M E N T A L R E V I E W
Appendix A Bore Completion Diagrams
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A. Bor e Compl etion Di agrams
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decreased gravel component
Mo
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USC DESCRIPTION OF STRATA
TUFF: silt with sand, fine to very finecoarse grain sand, light grey/tan colour,minor gravels up to 10mm in diameter
increased sand component
WELL CONSTRUCTION DETAILS
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SILTSTONE: silt with gravels up to 20mmin diameter, fine to coarse grain sand, tancolour
TUFF
SILTS
ML
silt with gravels, decreased gravelcomponent up to 7mm in diameter
D
SILT with Gravel: grey/red/brown colour,gravels up to 10mm in diameter, angular
Pre-collar -254mm
Cementtopseal
D
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203mmdiameter solidsteel casing
Ha
mm
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RN35486
Standpipe
Welded top plate
Logged By:
Checked By:
Date Started:
Date Finished:
MONITORING WELL NPPB1
08 8941 3920
MK6
Sheet 1 of 6
08 8980 2900URS Australia
Level 3, 93 Mitchell Street, Darwin
0
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Drilling Contractor:
254 mm
61.00 m
203 mm
Bore Size:
Total Depth:
Casing Size:
Project No.: 42213762
112.67
8507303.87 mN
775723.03 mE
Client:
Down hole hammer
Drill Fluid:
BMW
CMH
12-12-06
19-12-06 Foam
Burnside Operations
North Point
Permit No:
Location:
Drill Model:
Bores NT
Relative Level:
Coordinates:
Drill Type:
BurnsideOperations
GRAYWACKE: silt with sand and gravel,gravels up to 7mm in diameter, very fine tocoarse grain sand, poorly to well sorted
foam injected at 13m bgl
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Standing waterlevel at 13.05mTOC at 22/1/07
D
increased gravel component, up to 12mmin diameter, poorly sorted
D
decreased gravel component, increasedsand component
increased gravel component up to 4mm indiameter
SILTSTONE: gravel with silt, gravels up to10mm in diameter, poorly to well sorted,grey/tan colour
GRAYWACKE: gravel with silt, wellsorted gravels up to 15mm in diameter,subangular to subrounded, tan colour
decreasing gravel component, increasingsilt component
USC DESCRIPTION OF STRATA
Le
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Cla
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Mo
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(m
)
Pre-collar -254mm
SILTS
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203mmdiameter solidsteel casing
DTUFF
Burnside Operations
WELL CONSTRUCTION DETAILS
ProjectNo.:
ProjectReference:
10
11
12
13
14
15
16
17
18
19
20
21
Ca
sin
g
08 8980 2900
Sheet 2 of 6
08 8941 3920
MONITORING WELL NPPB1
URS Australia
Level 3, 93 Mitchell Street, Darwin
Pe
ne
tra
tio
n
M RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Me
tho
d
Air
lift
(l/
se
c)
42213762
Wa
ter
De
pth
(m
)
Cla
ssif
ica
tio
nH
TUFF: silt with gravel, dark grey, up to5mm in diameter, angular to subangular
decreased silt component, increasedgravel component up to 25mm in diameter
water cut at 24m bgl
decreasing silt component with depth
gravels up to 10mm in diameter, angular,well sorted, pale grey
W
Le
ge
nd
M
Mo
istu
re
WELL CONSTRUCTION DETAILS
De
pth
(m
)
SCa
sin
g
Pe
ne
tra
tio
n
EN
VIR
O_
WE
LL
_A
DE
LA
IDE
W
CC
_A
US
.GD
T J:\JO
BS
\42
21
37
62
\BO
RE
LO
GS
\LO
GS
NO
RT
H P
OIN
T.G
PJ 2
3/2
/07
R
USC DESCRIPTION OF STRATA
TUFF
10l/sec
18l/sec
GRYW
Pre-collar -254mm
24m bgl: 366 uS/cm 7.35 pH
28m bgl: 174.4 uS/cm 7.6 pH
Ha
mm
er
203mmdiameter slottedsteel casing
D/M
W
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
08 8941 3920
M
ProjectNo.:
ProjectReference:
22
23
24
25
26
27
28
29
30
31
32
33
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 3 of 6
Sample
Parameters
Me
tho
d
Air
lift
(l/
se
c)
Wa
ter
De
pth
(m
)
Burnside Operations42213762
MONITORING WELL NPPB1
USC DESCRIPTION OF STRATA
W
W
W
gravels up to 15mm in diameter, angular,poorly to well sorted
GRAYWACKE: silt with gravel, gravels upto 10mm in diameter, grey colour
increased gravel component up to 20mmin diameter, dark grey colour
W
Le
ge
nd
Cla
ssif
ica
tio
n
Mo
istu
re
WELL CONSTRUCTION DETAILS
decreased gravel component up to 10mmin diameter
S
EN
VIR
O_
WE
LL
_A
DE
LA
IDE
W
CC
_A
US
.GD
T J:\JO
BS
\42
21
37
62
\BO
RE
LO
GS
\LO
GS
NO
RT
H P
OIN
T.G
PJ 2
3/2
/07
Pe
ne
tra
tio
n
M
decreased gravel component
GRYW
pyrite crystals up to 3mm in diameter
gravels up to 20mm in diameter, angular
gravels up to 15mm in diameter, angular
12l/sec
12l/sec
18l/sec
W
TUFF
W
36m bgl 186.1 uS/cm 7.86 pH
40m bgl: 168.2 uS/cm 7.86 pH
42m bgl: 153.8 uS/cm 7.69 pH
Ha
mm
er
203mmdiameter slottedsteel casing
W
W
Ca
sin
g
De
pth
(m
)
Burnside OperationsProjectNo.:
ProjectReference:42213762
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 4 of 6
08 8941 3920
MONITORING WELL NPPB1
34
35
36
37
38
39
40
41
42
43
44
45
H
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Me
tho
d
Air
lift
(l/
se
c)
Wa
ter
De
pth
(m
)
R
Le
ge
nd
R
W
W
W
W
W
W
Ha
mm
er
USC DESCRIPTION OF STRATA
54m bgl: 153.4 uS/cm 7.39 pH
Cla
ssif
ica
tio
n
Mo
istu
re
WELL CONSTRUCTION DETAILS
De
pth
(m
)
S
MUDSTONE: silt with gravel, quartzgravels up to 30mm in diameter, poorlysorted
Pe
ne
tra
tio
n
EN
VIR
O_
WE
LL
_A
DE
LA
IDE
W
CC
_A
US
.GD
T J:\JO
BS
\42
21
37
62
\BO
RE
LO
GS
\LO
GS
NO
RT
H P
OIN
T.G
PJ 2
3/2
/07
decreased quartz gravels
gravels up to 5mm in diameter, well sorted
TUFF: silt with gravel, gravels up to 15mmin diameter, poorly sorted
gravels up to 40mm in diameter
increase in gravel component
16l/sec
20l/sec
203mmdiameter slottedsteel casing
M
GRYW
MUDS
TUFF
48m bgl: 163.9 uS/cm 8.05 pH
Burnside OperationsC
asin
g
ProjectNo.:
ProjectReference:
46
47
48
49
50
51
52
53
54
55
56
57
H
08 8980 2900
Sheet 5 of 6
08 8941 3920
MONITORING WELL NPPB1
URS Australia
Level 3, 93 Mitchell Street, Darwin
Air
lift
(l/
se
c)
Wa
ter
De
pth
(m
)
Me
tho
d
Sample
ParametersType, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
42213762
EN
VIR
O_
WE
LL
_A
DE
LA
IDE
W
CC
_A
US
.GD
T J:\JO
BS
\42
21
37
62
\BO
RE
LO
GS
\LO
GS
NO
RT
H P
OIN
T.G
PJ 2
3/2
/07
Cla
ssif
ica
tio
n
Mo
istu
re
WELL CONSTRUCTION DETAILS
De
pth
(m
)
SCa
sin
g
Pe
ne
tra
tio
n
USC DESCRIPTION OF STRATA
RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Me
tho
d
Air
lift
(l/
se
c)
decreased gravel component
M
increase in gravel component, up to15mm in diameter
quartz vein, quartz gravel up to 100mm indiameter in fine silt, increased waterproduction ~ 25 to 30 L/Sec
End of Hole at 61m bgl
Le
ge
nd
Ha
mm
er
End Cap
W
W
W
TUFF
Wa
ter
De
pth
(m
)
58
59
60
61
62
63
64
65
66
67
68
69
URS Australia
Level 3, 93 Mitchell Street, Darwin
Sheet 6 of 6
ProjectReference:08 8941 3920
MONITORING WELL NPPB1
08 8980 2900 ProjectNo.: 42213762 Burnside Operations
SILTSTONE: fine grain with gravels up to2mm in diameter, brown/tan colour
MUDSTONE: fine grain, gravels up to15mm in diameter, grey colour
very fine grain, yellow/tan colour
SILTSTONE: very fine grain palegrey/cream colour, fine grain with gravelsup to 1mm in diameter
MUDSTONE: very fine grain, dark greycolour, minor rounded gravels up to 4mmin diameter
SILTSTONE: very fine grain. cream/tancolour, 10% gravels up to 4mm indiameter
DOLERITE: fine grain, cream/tan colour,gravels up to 10mm in diameter, rounded
SILT with SAND: very fine grain sand,cream/tan colour, minor gravels up to5mm in diameter
Bentonite plug
Cementtopseal
D
D
D
SILTSTONE: very fine grain, cream/tancolour, minor gravels up to 5mm indiameter
USC DESCRIPTION OF STRATA
M
Penetration
ENVIRO_WELL_ADELAIDE WCC_AUS.G
DT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.G
PJ 23/2/07
S
WELL CONSTRUCTION DETAILS
Moisture
Legend
D
Classification
D
MUDS
SILTS
MUDS
SILTS
DOL
SILTS
ML
Casing
D
D
D
50mm diametersolid PVCcasing.
Hammer
Pre-collar -254mm
SILTS
D
RN35483
Bores NT
ProjectReference:
PVC cap
MK6
Foam
Burnside Operations
North Point
Permit No:
Depth (m)
Location:
R
Drill Model:
Logged By:
Checked By:
Date Started:
Date Finished:
MONITORING WELL NPMB1
08 8941 3920
08 8980 2900
BMW
CMH
8-12-06
9-12-06
URS Australia
Level 3, 93 Mitchell Street, Darwin
0
1
2
3
4
5
6
7
8
9
Standpipe
Sheet 1 of 6
Relative Level:
Coordinates:
H
Sample
Parameters
Method
Airlift (l/sec)
Water Depth (m)
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Drill Type:
BurnsideOperations
Bore Size:
Total Depth:
Casing Size:
42213762
Drill Fluid:
Drilling Contractor:
146 mm
61.00 m
mm
Project No.:
113.22
8507391.73 mN
775738.83 mE
Client:
Down hole hammer
Moisture
ENVIRO_WELL_ADELAIDE WCC_AUS.G
DT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.G
PJ 23/2/07
SILTSTONE: very fine grain, yellow/tancolour
MUDSTONE: very fine grain, tan/grey,minor carbonaceous gravels up to 2mm indiameter
GRAYWACKE: fine grain, minor gravelsup to 4mm in diameter, grey colour
USC DESCRIPTION OF STRATA
Standing waterlevel at 13.5 mTOC at 22/1/07
Classification WELL CONSTRUCTION DETAILS
Depth (m)
SCasing
Penetration
M H Legend
SILTS
MUDS
GRYW
Gravel - 5mmdiameter
rounded gravelpack
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Hammer
D
D/M
M/W
08 8980 2900
R
ProjectReference:
10
11
12
13
14
15
16
17
18
19
20
21
URS Australia
Level 3, 93 Mitchell Street, Darwin
Sample
Parameters
Sheet 2 of 6
08 8941 3920
MONITORING WELL NPMB1
Method
Airlift (l/sec)
Water Depth (m)
ProjectNo.: 42213762 Burnside Operations
Hammer
W
W
W
W
W
W
50mm diametersolid PVCcasing.
W
30m bgl: 224 uS/cm 5.96 pH
24m bgl: 132 uS/cm 6.2 pH
fine to coarse grain sand, minor siltgravels up to 30mm in diameter, wellsorted
WSILTSTONE: very fine to coarse grain,brown/tan/grey color, gravels up to 3mmin diameter
water cut at 24m
GRAYWACKE: fine to coarse grain sand,minor silt gravels up to 30mm in diameter,poorly sorted
SILTSTONE: silt and clay with gravels,low to medium plasticity, fine to coarsesand, gravels up to 20mm in diameter
SILTSTONE: silt and clay with somegravels, low to medium plasticity, gravelsup to 30mm in diameter
SILTSTONE: silt and clay with somegravels, low to medium plasticity, gravelsup to 4mm in diameter
GRAYWACKE: fine grain, well sortedsubangular gravels with minor sandgravels from 2-3mm up to 5mm indiameter - broken ground
ENVIRO_WELL_ADELAIDE WCC_AUS.G
DT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.G
PJ 23/2/07
W
6l/sec
Gravel - 5mmdiameter
rounded gravelpack
W
SILTSTONE: very fine grain, gravels up to2mm in diameter
GRYW
SILTS
SILTS
GRYW
6l/sec
SILTS
SILTSTONE: well sorted, gravels up to1mm in diameter
GRYW
SILTS
SILTS
SILTS
ProjectNo.: Burnside Operations42213762
GRAYWACKE: fine grain, grey in colour,low to medium plasticity, minor gravels upto 1mm in diameter
Sheet 3 of 6
MONITORING WELL NPMB1
08 8941 3920
ProjectReference:
08 8980 2900URS Australia
Level 3, 93 Mitchell Street, Darwin
22
23
24
25
26
27
28
29
30
31
32
33
Classification WELL CONSTRUCTION DETAILS
S Moisture
Depth (m)
Legend
USC DESCRIPTION OF STRATASample
Parameters
Water Depth (m)
Airlift (l/sec)
Method
Casing
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observationsHRM
Penetration
Depth (m)
fine to coarse grain sand, minor siltgravels up to 30mm in diameter, wellsorted, higher percentage of gravels thansand
foam injected at 34m bgl
fine to coarse grain sand, grey in color,gravels up to 15mm in diameter
increased sand component, decreasedgravel component, minor silt
increased gravel component (quartz), upto 50mm in diameter
decreased gravel component, minor silt
USC DESCRIPTION OF STRATA
Legend
Classification
Sample
Parameters
WELL CONSTRUCTION DETAILS
SCasing
Penetration
M
6l/sec
ENVIRO_WELL_ADELAIDE WCC_AUS.G
DT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.G
PJ 23/2/07
H
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Moisture
50mm diametersolid PVCcasing.
6l/sec
6l/sec
GRYW34m bgl: 98.8 uS/cm 6.07 pH
36m bgl: 26.8 uS/cm 6.5 pH
Gravel - 5mmdiameter
rounded gravelpack
Hammer
W
W
W
W
W
R
42m bgl: 125.6 uS/cm 7.33 pH
MONITORING WELL NPMB1
Method
08 8941 3920
ProjectReference:
34
35
36
37
38
39
40
41
42
43
44
45
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 4 of 6
Airlift (l/sec)
Water Depth (m)
42213762 Burnside OperationsProjectNo.:
USC DESCRIPTION OF STRATA
Gravel - 5mmdiameter
rounded gravelpack
increased gravel component
gravels up to 30mm in diameter
decreased gravel component
approximately 20% gravels up to 15mm indiameter
decreased gravel component
fine to very coarse grain sand, somegravels up to 15mm in diameter, dark greycolor
coarse grain gravel, pebbles up to 35mmin diameter
Legend
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
SCasing
6l/sec
M
ENVIRO_WELL_ADELAIDE WCC_AUS.G
DT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.G
PJ 23/2/07
increased gravel size, up to 70mm indiameter
50mm diametersolid PVCcasing.
6l/sec
GRYW
48m bgl: 168.8 uS/cm 7.05 pH
Hammer
50mm diameterslotted PVCcasing
W
W
W
W
W
W
W
W
54m bgl: 133 uS/cm 7.25 pH
R
Penetration
08 8941 3920
ProjectNo.:
ProjectReference: Burnside Operations
46
47
48
49
50
51
52
53
54
55
56
57
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 5 of 6
H
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Airlift (l/sec)
Water Depth (m)
MONITORING WELL NPMB1
42213762
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
SCasing
Penetration
RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
6l/sec
Water Depth (m)
ENVIRO_WELL_ADELAIDE WCC_AUS.G
DT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.G
PJ 23/2/07
M
Hammer
GRYW
Legend
60m bgl: 130.1 uS/cm 7.34 pH
USC DESCRIPTION OF STRATA
End Cap
Wreduced gravel component
End of Hole at 61m bgl
Airlift (l/sec)
58
59
60
61
62
63
64
65
66
67
68
69
URS Australia
Level 3, 93 Mitchell Street, Darwin
ProjectReference:
Sheet 6 of 6
08 8941 3920
MONITORING WELL NPMB1
08 8980 2900 ProjectNo.: 42213762 Burnside Operations
silt grey/tan colour, minor gravels up to5mm diameter, slightly friable
GRAYWACKE: silt with gravel, gravels upto 10-15mm in diameter, well sorted, palegrey/tan colour
Cementtopseal
SILTSTONE: silt grey/tan, minor gravelsup to 5mm diameter
SILTSTONE: minor gravels up to 10mm indiameter, grey colour
TUFF: silt and sand with gravel up to20mm in diameter, grounded to subrounded, dark grey in colour
SILT with SAND: very fine grain sand,cream/ tan colour, minor gravels up to5mm in diameter
Bentonite plug
Gravel - 5mmdiameter
rounded gravelpack
Airlift (l/sec)
silt with sand and minor gravels up to3mm in diameter, light brown/tan/redcolour
S
Method
Sample
Parameters
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.GPJ 23/2/07
HM
Casing
Depth (m)
WELL CONSTRUCTION DETAILS
Moisture
Classification
Legend
USC DESCRIPTION OF STRATA
Penetration
GRYW
SILTS
SILTS
TUFF
ML
Hammer
D
D
D
D
D
D
50mm diametersolid PVCcasing.
Pre-collar -254mm
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
D
Logged By:
Checked By:
Date Started:
Date Finished:
PVC cap
Location:
ProjectReference:
MK6
RN35484 Foam
Burnside Operations
R
Permit No:
Water Depth (m)
08 8980 2900
MONITORING WELL NPMB2
08 8941 3920
Sheet 1 of 6
Standpipe
URS Australia
Level 3, 93 Mitchell Street, Darwin
0
1
2
3
4
5
6
7
8
9
BMW
CMH
10-12-06
11-12-06
North Point
Down hole hammer
Drill Fluid:
123.36
8507060.67 mN
775781.01 mE
Client:
42213762
Drill Model:
Bores NT
Relative Level:
Coordinates:
Drill Type:
BurnsideOperations
Bore Size:
Total Depth:
Casing Size:
Drilling Contractor:Project No.:
146 mm
67.00 m
mm
Gravel - 5mmdiameter
rounded gravelpack
SILTSTONE: silt, minor gravels up to1mm in diameter, pale grey/tan
SILTSTONE: silt, minor gravels up to7mm in diameter, pale grey/, slightlyfriable
SILTSTONE: silt with minor sand gravelsup to 1mm in diameter, tan colour
SILTSTONE: silt, minor gravels up to2mm in diameter, grey colour
silt, minor gravels up to 2mm in diameter,dark grey colour
silt, minor gravels up to 2mm in diameter,lighter grey colour
M
D/M
USC DESCRIPTION OF STRATA
Legend
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
Casing
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.GPJ 23/2/07
SILTS
SILTS
SILTS
SILTS
D/M
D/M
Hammer
50mm diametersolid PVCcasing.
D/M
D/M
D/M
Penetration
S
ProjectNo.:
ProjectReference:
10
11
12
13
14
15
16
17
18
19
20
21
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 2 of 6
08 8941 3920
MONITORING WELL NPMB2
RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Airlift (l/sec)
Water Depth (m)
Burnside Operations42213762
SILTSTONE: silt with minor fine coarsegrain sand, minor gravels up to 1mm indiameter
W
W
Standing waterlevel at 23.52 mTOC at 22/1/07
Gravel - 5mmdiameter
rounded gravelpack
SILTSTONE: silt, minor sand, gravels upto 2mm in diameter, tan/grey colour
Depth (m)
SILTSTONE/GRAYWACKE: silt withminor fine gravels, sorted, grey/tan colour
D/M
water cut at 30m bgl
GRAYWACKE: silt with gravel, gravels upto 10mm in diameter, pale grey/tan
USC DESCRIPTION OF STRATA
4l/sec
Classification
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.GPJ 23/2/07
WELL CONSTRUCTION DETAILS
SILTSTONE: silt, grey/tan colour
SILTS
SILTS
SILTS
SILTS
GRYW
M/W
D/M
30m bgl: 64.3 uS/cm 10.89 pH
Hammer
50mm diametersolid PVCcasing.
D/M
Moisture
S Legend
ProjectNo.:
ProjectReference:42213762
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 3 of 6
08 8941 3920
MONITORING WELL NPMB2
22
23
24
25
26
27
28
29
30
31
32
33
Casing
Penetration
M RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Burnside Operations
Water Depth (m)
Airlift (l/sec)
Classification
Gravel - 5mmdiameter
rounded gravelpack
increasing gravels up to 5mm diameter,well sorted, coarse sand
TUFF: sand with silt and gravel, fine tocoarse grain sand, minor gravels up to4mm in diameter, dark grey colour
sand with silt and gravel, fine to coarsegrain sand, minor gravels up to 2mm indiameter
GRAYWACKE: gravel and sand, fine tocoarse grain sand, gravels up to 25mm indiameter
gravel and sand, fine to coarse grain sand,gravels up to 10mm in diameter
H Legend
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
SCasing
Penetration
M
7l/sec
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.GPJ 23/2/07
USC DESCRIPTION OF STRATA
GRYW
TUFF
GRYW
40m bgl: 395 uS/cm 9.25 pH
Hammer
50mm diametersolid PVCcasing.
W
W
W
W
W
R
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
ProjectNo.:
ProjectReference:
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 4 of 6
08 8941 3920
34
35
36
37
38
39
40
41
42
43
44
45
Sample
Parameters
Method
Airlift (l/sec)
Water Depth (m)
MONITORING WELL NPMB2
42213762 Burnside Operations
Legend
Gravel - 5mmdiameter
rounded gravelpack
TUFF: sand with gravels, very fine tomedium grain sand, minor gravels up to60mm in diameter, minor silt
GRAYWACKE: gravel with sand, minorsilt component, gravels up to 25mm indiameter, well to poorly sorted
gravel with sand, gravels well to poorlysorted, up to 10mm in diameter
gravel with sand, gravels well to poorlysorted, up to 20mm in diameter
R
USC DESCRIPTION OF STRATA
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
SCasing
6l/sec
M
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.GPJ 23/2/07
6l/sec
GRYW
TUFF
GRYW
46m bgl 228 uS/cm 8.3 pH
52m bgl: 176.2 8.22 pH
Hammer
50mm diametersolid PVCcasing.
W
W
W
W
46
47
48
49
50
51
52
53
54
55
56
57
08 8941 3920
H
Penetration
ProjectNo.:
ProjectReference:
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 5 of 6
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Airlift (l/sec)
Water Depth (m)
42213762 Burnside Operations
MONITORING WELL NPMB2
WELL CONSTRUCTION DETAILS
TUFF: sand and silt with gravels, 10%gravels up to 20mm in diameter, somequartz, very fine grain sand
End of Hole at 67.0m bgl
USC DESCRIPTION OF STRATA
Legend
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Moisture
End Cap
Depth (m)
SCasing
Penetration
6l/sec
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\LOGS NORTH POINT.GPJ 23/2/07
RH Classification
6l/sec
GRYW
W
58m bgl: 218 uS/cm 8.2 pH
66m bgl: 106 uS/cm 7.94 pH
Hammer
50mm diameterslotted PVCcasing
TUFF
Sample
Parameters
08 8941 3920
M
ProjectNo.:
ProjectReference:
58
59
60
61
62
63
64
65
66
67
68
69
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 6 of 6
Method
Airlift (l/sec)
Water Depth (m)
42213762 Burnside Operations
MONITORING WELL NPMB2
WELL CONSTRUCTION DETAILS
M
Penetration
Casing
H
Depth (m)
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Moisture
Classification
Legend
USC DESCRIPTION OF STRATA
S
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
R
Water Depth (m)
Airlift (l/sec)
Method
Sample
Parameters
TUFF203mmdiameter solidsteel casing
Hammer
GRYW
D
SILTS
Pre-collar -254mm
GRAYWACKE: silt with gravel, up to10mm in diameter, grey/tan colour
TUFF: silt with minor gravel, up to 15mmin diameter, orange colour
decrease in gravel component
DSILTSTONE: silt with gravel, pale grey/tancolour, gravels up to 20mm in diameter
D
Cementtopseal
D
D
gravels up to 10mm in diameter
RN35848
Welded top plate
Standpipe
ProjectReference:
Logged By:
Checked By:
Date Started:
Date Finished:
08 8941 3920
Sheet 1 of 7
URS Australia
Level 3, 93 Mitchell Street, Darwin
0
1
2
3
4
5
6
7
8
9
08 8980 2900
Drilling Contractor:
254 mm
78.00 m
203 mm
Bore Size:
Total Depth:
Casing Size:
Project No.:
7014.00 mN
9713.00 mE
Client:
Down hole hammer
Drill Fluid:
BMW
CMH
1-5-07
1-6-07
MONITORING WELL PLPB1
Foam
Burnside Operations
Princess Louise
Permit No:
42213762Location:
MK6Drill Model:
Bores NT
Relative Level:
Coordinates:
Drill Type:
BurnsideOperations
decreased gravel component
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
D
D Packer at21m bgl
gravels up to 8mm in diameter, mediumgrey colour
increase in gravel component, up to10mm in diameter
TUFF: silt with minor gravels up to 8mm indiameter, tan/cream/grey colour
GRAYWACKE: silt with gravels up to8mm in diameter, pink colour
gravels up to 6mm in diameter, grey/tancolour
D
gravels up to 15mm in diameter, mediumgrey colour
D
decreased gravel component, up to 5mmin diameter
USC DESCRIPTION OF STRATA
Legend
Classification WELL CONSTRUCTION DETAILS
TUFF: silt with minor gravels up to 5mm indiameter, pink/tan colour
GRYW
TUFF
GRYW
D
Depth (m)
Pre-collar -254mm
Hammer
203mmdiameter solidsteel casing
D
D
D
D
TUFF
Burnside Operations
Moisture
ProjectNo.:
ProjectReference:
10
11
12
13
14
15
16
17
18
19
20
21
S
08 8980 2900
Sheet 2 of 7
08 8941 3920
MONITORING WELL PLPB1
URS Australia
Level 3, 93 Mitchell Street, DarwinCasing
Penetration
M RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Water Depth (m)
42213762
Airlift (l/sec)
SMethod
decreased gravel component, up to 6mmin diameter, pale grey colour
gravels up to 20mm in diameter
water cut at 31m bgl
decreased silt component, gravels upto17mm in diameter, well sorted
USC DESCRIPTION OF STRATA
Legend
Classification
Moisture
decreased gravel component, up to 9mmin diameter, pale grey colour
Depth (m)
gravels up to 8mm in diameter, pale greycolour
Casing
Penetration
M RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
WELL CONSTRUCTION DETAILS
D/M
TUFF
Hammer
203mmdiameter slottedsteel casing
D
D
decreased gravel component, up to 7mmin diameter, pale grey colour
D
Airlift (l/sec)
M/W
W
W
Standing waterlevel at 26.0m
TOC at 18/1/07
decreased gravel component, up to 20mmin diameter, pale grey
decreased gravel component, up to 15mmin diameter
D
Sheet 3 of 7
Sample
Parameters
ProjectReference:
22
23
24
25
26
27
28
29
30
31
32
33
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
08 8941 3920
MONITORING WELL PLPB1
Water Depth (m)
ProjectNo.:
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
42213762 Burnside Operations
W
gravels up to 20mm in diameter
36m bgl: 225 uS/cm 6.77 pH
42m bgl: 224.4 uS/cm 6.99 pH
Hammer
203mmdiameter slottedsteel casing
W
W
W
TUFF W
URS Australia
Level 3, 93 Mitchell Street, Darwin
34
35
36
37
38
39
40
41
42
43
44
45
ProjectReference:
ProjectNo.:
W
2l//sec
08 8980 2900
Sheet 4 of 7
08 8941 3920
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
decrease in gravel component, increasedin silt component
3l/sec
TUFF
GRYW
MONITORING WELL PLPB1
Airlift (l/sec)
Method
42213762 Burnside Operations
Depth (m)
GRAYWACKE: silt with gravel, gravels upto 15mm in diameter, grey colour
gravels up to 2mm in diameter, very fineto coarse grain sand, grey colour
gravels up to 10mm in diameter
TUFF: silt with gravel and sand, gravels upto 18mm in diameter, well sorted
USC DESCRIPTION OF STRATA
Legend
Classification
Water Depth (m)
WELL CONSTRUCTION DETAILS
SCasing
Penetration
M RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Moisture
W
48m bgl
54m bgl
Hammer
203mmdiameter slottedsteel casing
W
W
W
W
GRAYWACKE: sand with silt and gravel,gravels up to 3mm in diameter
increase in gravel component, gravels upto 8mm in diameter
decrease in gravel component, gravels upto 10mm in diameter
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
GRAYWACKE: silt with sand and gravel,gravels up to 8mm in diameter
W
Foam
USC DESCRIPTION OF STRATA
Legend
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
SCasing
Penetration
M
Foam
gravels up to 15mm in diameter
TUFF
GRYW
MUDS
GRYW
MUDSTONE: silt with sand and gravel,very fine to coarse grain sand, gravels upto 30mm in diameter
ProjectNo.:
ProjectReference:
46
47
48
49
50
51
52
53
54
55
56
57
08 8980 2900
Sheet 5 of 7
08 8941 3920
MONITORING WELL PLPB1
URS Australia
Level 3, 93 Mitchell Street, Darwin
Airlift (l/sec)
Method
Sample
ParametersType, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Burnside Operations
H
42213762
Water Depth (m)
R
Casing
gravels up to 5mm diameter, evidence ofoxidation
USC DESCRIPTION OF STRATA
Legend
Classification
Moisture
WELL CONSTRUCTION DETAILS
Airlift (l/sec)
S
evidence of oxidation
Penetration
M R
Foam
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
Method
Depth (m)
Hammer
3l/sec
GRYW
minor oxidation
68m bgl: 400 uS/cm 7.3 pH
minor oxidation
203mmdiameter slottedsteel casing
W
W
W
W
Sample
Parameters
62m bgl
URS Australia
Level 3, 93 Mitchell Street, Darwin 08 8941 3920
Water Depth (m)
MONITORING WELL PLPB1
H
ProjectNo.:
58
59
60
61
62
63
64
65
66
67
68
69
08 8980 2900
Sheet 6 of 7
ProjectReference:42213762 Burnside Operations
MUDSTONE: sand with silt and gravel,dark grey colour, oxidised gravels up to6mm in diameter, non oxidised gravels upto 8mm in diameter
gravels up to 20mm in diameter, oxidisedgravels up to 3mm in diameter
oxidised gravels up to 12mm in diameter,non oxidised gravels up to 20mm indiameter
gravels up to 10mm diameter, reducedevidence of oxidation
increase in oxidised material
increase in gravel component, up to13mm in diameter, oxidised gravels up to7mm in diameter
GRAYWACKE: sand with silt and gravel,up to 8mm in diameter, no oxidation
End of Hole at 78m bgl
W
USC DESCRIPTION OF STRATA
Legend
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
S
4l/sec
Penetration
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
MUDS
GRYW W
W
74m bgl: 390 uS/cm 7.0 pH
Hammer
203mmdiameter slottedsteel casing
End Cap
W
W
W
W
MCasing
ProjectNo.:
ProjectReference:
70
71
72
73
74
75
76
77
78
79
80
81
URS Australia
Level 3, 93 Mitchell Street, DarwinBurnside Operations
08 8980 2900
Sheet 7 of 7
08 8941 3920
MONITORING WELL PLPB1
RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Airlift (l/sec)
Water Depth (m)
42213762
Casing
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observationsHR
Penetration
Airlift (l/sec)
S
Depth (m)
WELL CONSTRUCTION DETAILS
Moisture
Classification
Legend
M
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
Sample
Parameters
Method
Water Depth (m)
SILTS
USC DESCRIPTION OF STRATA
D
50mm diametersolid PVCcasing
Hammer
D
TUFF D
Gravel - 5mmdiameter
rounded gravelpack
TUFF: silt with minor gravels, gravels upto 5mm in diameter, orange colour
gravels up to 30mm in diameter, greycolour
gravels up to 20mm in diameter D
Bentonite plug
Cementtopseal
SILTSTONE: silt with gravels up to 30mmin diameter
PVC cap
08 8941 3920
Drill Fluid:
Sheet 1 of 7
Standpipe
URS Australia
Level 3, 93 Mitchell Street, Darwin
0
1
2
3
4
5
6
7
8
9
MK6
08 8980 2900
MONITORING WELL PLMB1
Bore Size:
Total Depth:
Casing Size:
42213762
BurnsideOperations
146 mm
73.00 m
mm
Project No.:
146.06
8504750.83 mN
775495.74 mE
Client:
Down hole hammer
Drilling Contractor: Location:
ProjectReference:
RN35487 Foam
Burnside Operations
Princess Louise
Logged By:
Checked By:
Date Started:
Date Finished:
BMW
CMH
1-5-07
1-6-07
Drill Model:
Bores NT
Relative Level:
Coordinates:
Drill Type:
Permit No:
M
Gravel - 5mmdiameter
rounded gravelpack
Standing waterlevel at 21.45 mTOC at 18/1/07
gravels up to 10mm in diameter, 80%gravels 1 to 5mm in diameter, grey colour
TUFF: silt with gravel, gravels up to 5mmin diameter, pale brownish/red colour
gravel up to 5mm in diameter, darkbrown/red colour
very fine silt, minor gravels up to 3mm indiameter
GRAYWACKE: silt with gravel, gravels upto 4mm in diameter, grey colour
increased gravel component, up to 15mmin diameter, grey colour
majority coarse grain sand up to 3mm indiameter
USC DESCRIPTION OF STRATA
Legend
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
SCasing
gravels up to 5mm in diameter, tan/pinkcolour, well sorted, majority coarse grainsand up to 1mm in diameter
Hammer
TUFF
TUFF
GRYW
50mm diametersolid PVCcasing.
D
D
D
D
D
D
D
D
Penetration
ProjectNo.:
ProjectReference:
10
11
12
13
14
15
16
17
18
19
20
21
URS Australia
Level 3, 93 Mitchell Street, DarwinBurnside Operations
08 8980 2900
Sheet 2 of 7
08 8941 3920
MONITORING WELL PLMB1
RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Airlift (l/sec)
Water Depth (m)
42213762
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
Depth (m)
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
increased gravel component, up to 5mmin diameter
SILTSTONE: silt with minor gravels,gravels up to 10mm in diameter, pale grey
silt with minor gravels, gravels up to15mm in diameter, pale grey
USC DESCRIPTION OF STRATA
Legend
Classification
increased gravel component, up to 5mmin diameter
WELL CONSTRUCTION DETAILS
gravels up to 4mm in diameter, greycolour, majority silt
SCasing
Penetration
M R
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Moisture
D
GRYW
SILTS
Hammer
decreased gravel component, up to 4mmin diameter
D
Sample
Parameters
D
D
M/W
W
Gravel - 5mmdiameter
rounded gravelpack
50mm diametersolid PVCcasing.
Sheet 3 of 7
ProjectNo.:
H
22
23
24
25
26
27
28
29
30
31
32
33
URS Australia
Level 3, 93 Mitchell Street, Darwin
Method
08 8980 2900
08 8941 3920
MONITORING WELL PLMB1
Airlift (l/sec)
Water Depth (m)
ProjectReference:42213762 Burnside Operations
increase in gravel component, up to20mm in diameter, evidence of oxidation
S
Gravel - 5mmdiameter
rounded gravelpack
water cut at 34m bgl
gravels up to 1mm in diameter, well sorted
SANDSTONE: gravel with sand and silt,gravels up to 20mm in diameter, sand fineto corse grain
decrease in gravel component, increase insand component
W
decrease in gravel component
W
decrease in gravel component, quartzgravels/pebbles up to 30mm in diameter,evidence of oxidation
MUDSTONE: gravel with silt and sand,90% of gravels up to 10mm in diameterwith minor gravels up to 40mm indiameter, weathering evident
increased yield at 44m bgl ~ 3L/sec
increased weathering and oxidationevident
1l/sec
Legend
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
gravels up to 10mm in diameter
1l/sec
SILTS
SANDS
MUDS
Classification
34m bgl: 527 uS/cm 6.2 pH
34m bgl: 317 uS/cm 6.36 pH
Hammer
50mm diametersolid PVCcasing.
W
W
W
W
W
W
W
W
Casing
ProjectReference:
ProjectNo.:
34
35
36
37
38
39
40
41
42
43
44
45
URS Australia
Level 3, 93 Mitchell Street, DarwinBurnside Operations
USC DESCRIPTION OF STRATA
42213762
MONITORING WELL PLMB1
08 8941 3920
Sheet 4 of 7
08 8980 2900
Penetration
M RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Airlift (l/sec)
Water Depth (m)
Casing
increase in gravel component, up to30mm in diameter, majority coarse grainsand up to 3mm in diameter
decrease in gravel component, up to15mm, evidence of oxidation
USC DESCRIPTION OF STRATA
Legend
Classification
Moisture
WELL CONSTRUCTION DETAILS
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
S
decrease in gravel component, up to10mm in diameter, increase in silt andfine to coarse grain sand
Penetration
M RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
2l/sec
Method
Depth (m)
W
MUDS 46m bgl: 341 uS/m 8.22 pH
Hammer
50mm diametersolid PVCcasing.
W
decrease in gravel component
Wincrease in gravel component, up to30mm in diameter
foam injected at 49m
W
W
Gravel - 5mmdiameter
rounded gravelpack
reduced weathering and oxidation,increase in gravel diameter, minor pyritecrystals evident
Airlift (l/sec)
W
Sheet 5 of 7
ProjectReference:
Sample
Parameters
46
47
48
49
50
51
52
53
54
55
56
57
URS Australia
Level 3, 93 Mitchell Street, Darwin
Water Depth (m)
08 8980 2900 ProjectNo.:08 8941 3920
MONITORING WELL PLMB1
42213762 Burnside Operations
Legend
R
Gravel - 5mmdiameter
rounded gravelpack
increase in gravel component up to 10mmin diameter
decreased gravel component, increase insand and silt component
MUDSTONE: gravel with sand and minorsilt, gravels up to 15mm in diameter, grey,very fine to coarse grain sand, evidence ofoxidation and weathering
increase in gravel component, minorgravels up to 25mm in diameter, evidenceof oxidation
well sorted, minor gravels up to 15mm indiameter, minor oxidised evident
USC DESCRIPTION OF STRATA
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
SCasing
3l/sec
M
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
3l/sec
MUDS
MUDS
60m bgl: 297 uS/cm 8.02 pH
66m bgl: 235 uS/cm 7.98 pH
Hammer
50mm diametersolid PVCcasing.
50mm diameterslotted PVCcasing
W
W
W
W
W
58
59
60
61
62
63
64
65
66
67
68
69
H
Penetration
ProjectNo.:
ProjectReference:
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 6 of 7
08 8941 3920
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Airlift (l/sec)
Water Depth (m)
Burnside Operations42213762
MONITORING WELL PLMB1
M
USC DESCRIPTION OF STRATA
Legend
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
S Water Depth (m)
Penetration
increase in gravel component, up to25mm in diameter, evidence ofoxidisidation
RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Casing
Hammer
MUDS
End of Hole at 73m bgl
50mm diameterslotted PVCcasing
End Cap
W
W
W
gravels up to 4mm in diameter
gravels up to 3mm in diameter, well sortedcoarse sand with silt and very fine grainsand
Sheet 7 of 7
ProjectReference:
Airlift (l/sec)
70
71
72
73
74
75
76
77
78
79
80
81
URS Australia
Level 3, 93 Mitchell Street, Darwin
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
08 8980 2900 ProjectNo.:08 8941 3920
MONITORING WELL PLMB1
42213762 Burnside Operations
Depth (m)
WELL CONSTRUCTION DETAILS
Moisture
Classification
Legend
Casing
Penetration
GRAYWACKE: silt with gravel, gravels upto 30mm in diameter, yellow/tan/orangecolour
gravels up to 20mm in diameter, pink/tancolour
SILTSTONE: silt with minor gravels,gravels up to 6mm in diameter, medium todark grey
USC DESCRIPTION OF STRATA
Method
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
S
Airlift (l/sec)
GRAYWACKE: silt with gravel, pale tangravels up to 30mm in diameter
Sample
ParametersType, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observationsHRM
Water Depth (m)
GRYW
gravels up to 15mm in diameter
GRYW
Hammer
SILTS
D
Bentonite plug
Gravel - 5mmdiameter
rounded gravelpack
Cementtopseal
D
D
D
D
D
50mm diametersolid PVCcasing
gravels up to 13mm in diameter
Standpipe
PVC cap
ProjectReference:
Logged By:
Checked By:
Date Started:
Date Finished:
MK6
RN35489 Foam
Sheet 1 of 6
MONITORING WELL PLMB2
08 8941 3920
08 8980 2900URS Australia
Level 3, 93 Mitchell Street, Darwin
0
1
2
3
4
5
6
7
8
9
Burnside Operations
Down hole hammer146 mm
66.00 m
mm
Project No.:
6950.00 mN
9694.00 mE
Princess Louise
Drill Fluid:
Client:
Drill Type:BMW
CMH
1-4-07
1-8-07
Location:Drilling Contractor:
Drill Model:
Relative Level:
Coordinates:
Bores NT
BurnsideOperations
Bore Size:
Total Depth:
Casing Size:
42213762
Permit No:
Penetration
Water Depth (m)
USC DESCRIPTION OF STRATA
Legend
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
GRAYWACKE: silt with minor gravels,gravels up to 25mm in diameter, minorpale/grey silt, very fine silt (powder like)
Casing
SILTSTONE: silt with minor gravels,gravels up to 6mm in diameter, grey/pinkcolour
M RH
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
S
50mm diametersolid PVCcasing.
SILTS
GRYW
D
D
Standing waterlevel at 14.775
m TOC at18/1/07
Gravel - 5mmdiameter
rounded gravelpack
Hammer
Sheet 2 of 6
Airlift (l/sec)
10
11
12
13
14
15
16
17
18
19
20
21
URS Australia
Level 3, 93 Mitchell Street, Darwin
ProjectNo.:
08 8980 2900
08 8941 3920
MONITORING WELL PLMB2
ProjectReference:
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
42213762 Burnside Operations
Legend
dark grey
SILTSTONE: sand with silt and minorgravels, very fine to medium grain sand,grey colour
water cut at 25m bgl
gravels up to 5mm in diameter, very fineto coarse grain sand
increase in gravel component, up to20mm in diameter
gravels up to 5mm in diameter
gravels up to 10mm in diameter, minoroxidation
gravels up to 15mm in diameter, increasein oxidation
gravels up to 8mm in diameter, evidenceof oxidation, very fine to medium grainsand
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
USC DESCRIPTION OF STRATA
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
SCasing
Penetration
M
3l/sec
D/MGRYW
SILTS
30m bgl: 300 uS/cm 7.5 pH
Gravel - 5mmdiameter
rounded gravelpack
50mm diametersolid PVCcasing.
W
W
W
W
W
W
W
R
Hammer
MONITORING WELL PLMB2
ProjectNo.:
ProjectReference:
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 3 of 6
08 8941 3920
22
23
24
25
26
27
28
29
30
31
32
33
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Airlift (l/sec)
Water Depth (m)
H
42213762 Burnside Operations
S
gravels up to 5mm in diameter, evidenceof oxidation
decrease in gravel component, evidence ofoxidation
increase in gravel component, evidence ofoxidation
USC DESCRIPTION OF STRATA
Legend
Classification
Moisture
Method
Depth (m)
Gravel - 5mmdiameter
rounded gravelpack
Casing
Penetration
M R
3l/sec
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
WELL CONSTRUCTION DETAILS
W
3l/sec
SILTS
36m bgl: 279 uS/cm 7.0 pH
42m bgl: 300 uS/sec 6.9 pH
Hammer
very fine to medium grain sand
Wincrease in gravel component, up to10mm in diameter, evidence of oxidation
W
W
W
Sample
Parameters
50mm diametersolid PVCcasing.
Sheet 4 of 6
Airlift (l/sec)
H
34
35
36
37
38
39
40
41
42
43
44
45
URS Australia
Level 3, 93 Mitchell Street, Darwin
ProjectNo.:
08 8980 2900 ProjectReference:08 8941 3920
MONITORING WELL PLMB2
Water Depth (m)
42213762 Burnside Operations
Legend
R
Gravel - 5mmdiameter
rounded gravelpack
GRAYWACKE: sand with silt and gravel,very fine coarse grain sand, gravels up to5mm
increase in gravel component, up to15mm, evidence of oxidation
decrease in gravel component, up to20mm in diameter
gravels up to 6mm in diameter
increase in gravel component, evidence ofoxidation
decreased gravel component
foam injected at 56m bgl
increase in gravel component
USC DESCRIPTION OF STRATA
Classification
Moisture
WELL CONSTRUCTION DETAILS
Depth (m)
SCasing
3l/sec
M
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
Hammer
Foam
SILTS
GRYW
56m bgl
50mm diametersolid PVCcasing.
W
W
W
W
W
W
W
50m bgl: 270 uS/cm 6.8 pH
46
47
48
49
50
51
52
53
54
55
56
57
08 8941 3920
H
Penetration
ProjectNo.:
ProjectReference:
MONITORING WELL PLMB2
URS Australia
Level 3, 93 Mitchell Street, Darwin
08 8980 2900
Sheet 5 of 6
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
Sample
Parameters
Method
Airlift (l/sec)
Water Depth (m)
42213762 Burnside Operations
SMethod
decreased gravel component, minoroxidation
End of Hole at 66m bgl
USC DESCRIPTION OF STRATA
Legend
Classification
Moisture
Gravel - 5mmdiameter
rounded gravelpack
Depth (m)
Casing
Penetration
M R
Foam
Type, plasticity / particle size, colour,secondary / minor components (e.g.,"trace"), moisture content, consistency /density, and additional observations
ENVIRO_WELL_ADELAIDE WCC_AUS.GDT J:\JOBS\42213762\BORE LOGS\GBS BORE LOGS.GPJ 23/2/07
WELL CONSTRUCTION DETAILS
GRYW
decreased gravel component
Sample
Parameters
62m bgl
Hammer
50mm diameterslotted PVCcasing
End Cap
W
W
08 8941 3920
MONITORING WELL PLMB2
H
ProjectReference:
58
59
60
61
62
63
64
65
66
67
68
69
08 8980 2900
Sheet 6 of 6
URS Australia
Level 3, 93 Mitchell Street, Darwin
Water Depth (m)
Airlift (l/sec)
ProjectNo.: 42213762 Burnside Operations
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to C
OPRIG
HT. It remains the property of URS Australia
Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 1.srf
Regional Locality Plan
CMAC RIJV 19/1/20071
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to C
OPRIG
HT. It remains the property of URS Australia
Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 2.srf
Sites and Surrounds
CMAC RIJV 19/1/20072
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to COPRIG
HT. It remains the property of URS Australia Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 3.srf
Bore Locations - North Point
CMAC RIJV 19/1/20073
NPPB1
NPMB2
NPMB1
9800 9900 10000 10100 10200
Mine Easting (m)
9100
9200
9300
9400
9500
9600
9700
9800
9900
10000
10100
Mine Northing (m)
Topographyic Contour (m RL)
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to COPRIG
HT. It remains the property of URS Australia Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 4.srf
Bore Locations - Princess Louise
CMAC RIJV 19/1/20074
9450 9500 9550 9600 9650 9700 9750 9800 9850 9900 9950 10000
Mine Easting (m)
6700
6750
6800
6850
6900
6950
7000
7050
7100
7150
7200
Mine Northing (m)
PLPB1
PLMB1
PLMB2
Topographyic Contour (m RL)
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to C
OPRIG
HT. It remains the property of URS Australia
Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 5.srf
Production Bore NPPB1Step-Rate Test
CMAC RIJV 31/1/20075
110
100
1,000
10,000
0 1 2 3 4 5
Drawdown (m)
Time (min)
Step 1 - 1,120 kL/day
Step 2 - 1,300 kL/day
Step 3 - 1,470 kL/day
Step 4 - 1,640 kL/day
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to C
OPRIG
HT. It remains the property of URS Australia
Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 6.srf
Production Bore PLPB1Step-Rate Test
CMAC RIJV 31/1/20076
110
100
1,000
10,000
0 1 2 3 4 5 6 7 8 9
10
Drawdown (m)
Time (min)
Step 1 - 260 kL/day
Step 2 - 360 kL/day
Step 3 - 430 kL/day
Step 4 - 510 kL/day
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to C
OPRIG
HT. It remains the property of URS Australia
Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 7.srf
Production Bore NPPB1Constant-Rate Test
CMAC RIJV 31/1/20077
110
100
1,000
10,000
0 1 2 3 4 5 6 7 8 9
10
Drawdown (m)
Time (min)
NPPB1 - Pumping R
ate 1,640 kL/day
S.W
.L 14.18 m
btoc
NPMB1
Distance - 243 m
S.W
.L - 14.7 m
NPMB2
Distance - 332 m
S.W
.L - 24.26 m
btoc
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to C
OPRIG
HT. It remains the property of URS Australia
Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 8.srf
Production Bore PLPB1Constant-Rate Test
CMAC RIJV 31/1/20078
110
100
1,000
10,000
0 2 4 6 8
10
12
14
16
18
20
Drawdown (m)
Time (min)
PLPB1 - Pumping R
ate 490 kL/day
S.W
.L - 26.60 m
btoc
PLMB1
Distance - 70 m
S.W
.L - 22.37 m
btoc
PLMB2
Distance - 92 m
S.W
.L - 16.10 m
btoc
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to C
OPRIG
HT. It remains the property of URS Australia
Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 9.srf
Regional Geology
CMAC RIJV 19/1/20079
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to COPRIG
HT. It remains the property of URS Australia Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 10.srf
Model Grid - North Point
CMAC RIJV 16/2/200710
9000 9200 9400 9600 9800 10000 10200 10400 10600 10800 11000
Mine Easting (m)
8600
8800
9000
9200
9400
9600
9800
10000
10200
10400
Mine Northing (m)
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to COPRIG
HT. It remains the property of URS Australia Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 11.srf
Model Grid - Princess Louise
CMAC RIJV 16/2/200711
7000 7500 8000 8500 9000 9500 10000 10500 11000 11500 12000 12500
Mine Easting (m)
4000
4500
5000
5500
6000
6500
7000
7500
8000
8500
9000
9500
10000
Mine N
orthing (m)
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to COPRIG
HT. It remains the property of URS Australia Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 12.srf
Distribution of HydraulicParameters - North Point
CMAC RIJV 16/2/200712
9600 9700 9800 9900 10000 10100 10200 10300 10400
Mine Easting (m)
8500
8600
8700
8800
8900
9000
Elevation m
RL
0
-100
-200
-300
-400
-500
Weathered Bedrock
Weathered Shear
Fresh Shear
Fresh Bedrock
9600 9700 9800 9900 10000 10100 10200 10300 10400
Mine Easting (m)
9100
9200
9300
9400
9500
9600
9700
9800
9900
10000
Mine Northing (m)
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to COPRIG
HT. It remains the property of URS Australia Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 13.srf
Distribution of HydraulicParameters - Princess Louise
CMAC RIJV 16/2/200713
Weathered Bedrock
Weathered Shear
Fresh Shear
Fresh Bedrock
9 8 0 0
9500 9550 9600 9650 9700 9750 9800 9850 9900
Mine Easting (m)
-500
0
500
Elevation m
RL
-100
100
9500 9600 9700 9800 9900
Mine Easting (m)
6600
6700
6800
6900
7000
7100
7200
7300
Mine Northing (m)
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to C
OPRIG
HT. It remains the property of URS Australia
Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 14.srf
Transient Calibration - North Point
CMAC RIJV 16/2/200714
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 0.5 1 1.5 2 2.5
Time (days)
Drawdown (m)
NPMB1
R100-NPMB1/A
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 0.5 1 1.5 2 2.5
Time (days)
Drawdown (m)
NPMB2
R100-NPMB2/A
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to C
OPRIG
HT. It remains the property of URS Australia
Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 15.srf
Transient Calibration - Princess Louise
CMAC RIJV 16/2/200715
-5
-4.5
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0.0 0.5 1.0 1.5 2.0 2.5
Time (d)
Drawdown (m)
PLMW01
R35 - PLM B1/A
-5
-4.5
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0.0 0.5 1.0 1.5 2.0 2.5
Time (d)
Drawdown (m)
PLMW02
R35 - PLMB2/A
PLMB1
PLMB2
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to C
OPRIG
HT. It remains the property of URS Australia
Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 16.srf
Estimated Groundwater PumpageNorth Point & Princess Louise
CMAC RIJV 16/2/200716
North Point
0
500
1000
1500
2000
2500
0 20 40 60 80 100 120 140
Time (days)
Dewatering Rate (kL/day)
Princess Louise
0
50
100
150
200
250
300
350
400
450
0 20 40 60 80 100 120 140
Time (days)
Dewatering Rate (kL/day)
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to COPRIG
HT. It remains the property of URS Australia Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 17.srf
Predicted Drawdown - North Point120 Days Pumpage at 2,073 kL/day
CMAC RIJV 16/2/200717
9000 9200 9400 9600 9800 10000 10200 10400 10600 10800 11000
Mine Easting (m)
8600
8800
9000
9200
9400
9600
9800
10000
10200
10400
Mine Northing (m)
Simulated Production Bore
Simulated Drawdown
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to COPRIG
HT. It remains the property of URS Australia Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 18.srf
Predicted Drawdown - Princess Louise120 Days Pumpage at 425 kL/day
CMAC RIJV 16/2/200718
Simulated Production Bore
Simulated Drawdown
7500 8000 8500 9000 9500 10000 10500 11000 11500
Mine Easting (m)
4500
5000
5500
6000
6500
7000
7500
8000
8500
9000
9500
Mine Northing (m)
Client: Project: Title:
Figure:Drawn: Approved: Date:
Job No: File No: A4
Rev A
Source:
This drawing is subject to C
OPRIG
HT. It remains the property of URS Australia
Pty Ltd.
Burnside Operations Pty Ltd Hydrogeological Assessments of the North Pointand Princess Louise Deposits for Mine Development
42213762 Figure 19.srf
Predicted Extent of Drawdown
CMAC RIJV 16/2/200719