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iii

TABLE OF CONTENTS 1. Introduction ........................................................................................................ 6

2. Face Position of Active Panels ......................................................................... 7

3. Summary of Management Action Taken ......................................................... 8

4. Consultation with Stakeholders ....................................................................... 9

4.1 CCC Meeting ................................................................................................ 9

5. Observed or Reported Subsidence Impacts ................................................. 10

5.1 Incidents ..................................................................................................... 10

5.2 Service difficulties ....................................................................................... 10

5.3 Community complaints ............................................................................... 10

5.4 Impacts Detected During Monitoring/Inspections ....................................... 10

6. Subsidence Monitoring ................................................................................... 11

6.1 Monitoring Results and Trends ................................................................... 11

6.1.1 700A and 700 B Lines ......................................................................... 11

6.1.2 707 Line ............................................................................................... 14

6.1.3 609A and 609D Lines .......................................................................... 15

6.1.4 800B Line ............................................................................................ 18

6.1.5 800C Line ............................................................................................ 18

6.2 Cliffline and Pagoda Photographic Monitoring ............................................ 19

7. Environmental Monitoring .............................................................................. 20

7.1 Photographic Monitoring of Newnes Plateau Shrub Swamps .................... 20

7.2 Groundwater Monitoring ............................................................................. 20

7.2.1 Open Hole Piezometers ...................................................................... 21

7.2.2 Multi-level Piezometers ....................................................................... 22

7.3 Surface Water Monitoring ........................................................................... 34

7.4 Flora Monitoring .......................................................................................... 34

7.4.1 Outbye Area ........................................................................................ 34

7.4.2 700 Area and Eastern Area ................................................................. 36

7.4.3 800 Area .............................................................................................. 37

7.4.4 900 Area .............................................................................................. 38

iv

7.5 Fauna Monitoring ........................................................................................ 38

7.5.1 800 Area .............................................................................................. 39

7.5.2 900 Area .............................................................................................. 39

7.5.3 Outbye Area ........................................................................................ 41

7.5.4 700 Area .............................................................................................. 43

7.5.5 700 West Area ..................................................................................... 44

7.6 Cliff Line and Pagoda Photographic Monitoring ......................................... 46

8. Adequacy, Quality and Effectiveness ............................................................ 47

9. Proposed Management Actions ..................................................................... 48

10. Conclusion .................................................................................................... 50

Attachments Plan CL556 – Subsidence Monitoring and Current Workings at 30/06/2016.

Plan CL618 – Combined Surface Monitoring Points as at 30/06/2016.

v

LIST OF FIGURES Figure 1. 700A Line Subsidence. .............................................................................. 12

Figure 2. 700B Line Subsidence. .............................................................................. 13

Figure 3. 707 Line Subsidence. ................................................................................ 14

Figure 4. 609A Line Subsidence. .............................................................................. 16

Figure 5. 609D Line Subsidence. .............................................................................. 17

Figure 6. 800B Line Subsidence ............................................................................... 18

Figure 7. 800C Line Subsidence ............................................................................... 19

Figure 8. Open Hole Piezometer Results .................................................................. 22

Figure 9. CLRP1 Results .......................................................................................... 23

Figure 10. CLRP 2 Results ....................................................................................... 24

Figure 11. CLRP 3 Results ....................................................................................... 25

Figure 12. CLRP 15 Results ..................................................................................... 27

Figure 13. CLRP 16 Results ..................................................................................... 28

Figure 14. CC114 Results ......................................................................................... 29

Figure 15. CC115 Results ......................................................................................... 30

Figure 16. CLRP17 Piezometric Height .................................................................... 31



Figure 19. Location of Fauna Monitoring Sites in 800 SMP Area ............................. 39

Figure 20. Location of Fauna Monitoring Sites in 900 SMP Area ............................. 41

Figure 21. Location of Fauna Monitoring Sites in Outbye SMP Area ........................ 43

Figure 22. Location of Fauna Monitoring Sites in 700 Eastern SMP Area ................ 44

Figure 23. Location of Fauna Monitoring Sites in 700 Western SMP Area ............... 45

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1. Introduction

The following Subsidence Management Status Report (SMSR) complies with the

provisions of:

Condition 17 of the SMP Approval for 900 Area dated 21st January 2014 (due

to expire on 31st January 2019);

Condition 17 of the SMP Approval for 800 Area dated 1st November 2013

(due to expire on 31st October 2018); and

Condition 17 of the SMP Approval for 700 West (700W) dated 18th June 2012

(due to expire on 1st June 2017).

Reports continue to be sent every 4 months with data updated as results become

available. The following SMP approvals have now expired:

The Eastern Area SMP expired on 1st June 2013;

The Outbye Area SMP expired on 1st May 2014;

The 700 Area SMP expired on 1st May 2014; and

The 314 and 316 Area SMP Expired on 1st February 2015.

This report covers the period from 1st March to 30th June 2016.

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2. Face Position of Active Panels

Clarence Colliery worked within the 900 area and the 800 area during the reporting

period with the following mining activities taking place:

Development of the 706 Panel was undertaken throughout the reporting

period;

Development of the 808 panel continued throughout the reporting period;

Extraction of the 812 Panel commenced on 15th February 2016 and continued

throughout the reporting period;

Extraction of the 814 Panel commenced on 6th June 2016;

Development of the 911 panel was undertaken throughout the reporting

period;


period;


period.

All panels as at 30th June 2016 and subsidence monitoring lines are shown on

Plan CL556 provided in Attachment 1.

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3. Summary of Management Action Taken

Subsidence management actions taken during the reporting period included:

Community Consultative Committee (CCC) meeting held on 6th June 2016.

Dam Safety Committee

Quarter 1 of the DSC report was completed and submitted. There were no

mining activities within the Lithgow No.2 Dam Notification Area throughout the

reporting period.

Resurvey of the rock marks around Lithgow No.2 Dam was due during June,

however, due to the wet conditions throughout the month, the resurvey could

not be carried out safely.

Resurvey of the Lithgow No.2 Dam wall was also due during June, however,

due to the wet conditions throughout the month, the resurvey could not be

carried out safely. The dam was overtopping significantly for most of the month.

The 700A, 700B and 707 lines were resurveyed in June in line with the DSC

requirements.

Environmental and Subsidence Monitoring

Two-monthly downloads of multi-level groundwater piezometers continued

(CLRP1, CLRP2, CLRP3, CLRP6, CC114, CC115, CLRP11, CLRP12,

CLRP13, CLRP14, CLRP15 and CLRP16, CLRP17, CLRP18, CLRP19,

CLRP22) and open hole piezometers (CLRP4, CLRP5, CLRP7, CLRP8,

CLRP10 and CC113) during March and May 2016;

Ongoing flora and fauna monitoring (fieldwork for Autumn 2016 conducted);

Surface subsidence management inspections;

Ongoing underground mining system audits (in-panel and end of panel where

access permits);

There were no other requests to modify subsidence or environmental monitoring

programs during the reporting period.

SMP Approvals Varied or Expired

The 900 SMP Approval was varied to modify the orientation of panels in the west of

the SMP Area. Panel were reoriented form an east-west orientation to a north-south

orientation. The Approval was received on 7th June 2016.

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Other

The mid panel report for the 812 panel was completed and submitted on the 16th

June 2016.

4. Consultation with Stakeholders

4.1 CCC Meeting

Clarence Colliery held its quarterly CCC meeting on 6th June 2016. Items discussed

at the meeting relating to subsidence management included:

Overview of current operations and performance;

Mining activities;

Rehabilitation and River Clean Up; and

Environmental performance.

The next CCC meeting is scheduled for 10th October 2016.

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5. Observed or Reported Subsidence Impacts

5.1 Incidents

There were no observed or reported incidents relating to subsidence impacts in the

reporting period.

5.2 Service difficulties

There were no observed or reported service difficulties relating to subsidence

impacts in the reporting period.

5.3 Community complaints

There were no reported community complaints relating to subsidence impacts in the

reporting period.

5.4 Impacts Detected During Monitoring/Inspections

No adverse impacts were detected during monitoring or inspections.

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6. Subsidence Monitoring

6.1 Monitoring Results and Trends

6.1.1 700A and 700 B Lines

The resurvey of the subsidence monitoring lines was undertaken during June 2016.

The 700B line was resurveyed on 7th June, while the 700A line was resurveyed on 5th

June.

The 700A and 700B line results were all generally less than 50mm.

There were nine pegs that measured more than 50mm along the 700B above the

712 panel. Two of these pegs appear anomalous. Regardless, all subsidence results

are less than the 100mm performance criteria. The next survey for the 700A and

700B is scheduled for January 2017.

Results from the January 2016 survey of the 700 A line is presented in Figure 1 and results from the 700B Line is presented in Figure 2.

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Figure 1. 700A Line Subsidence.

-0.100

-0.080

-0.060

-0.040

-0.020

0.000

0.020Su

bsid

ence

(m)

Subsidence

12/02/10 21/06/10 14/01/11 15/03/11

04/07/11 30/01/12 07/09/12 30/01/13

25/07/13 20/01/14 09/07/14 14/01/15

01/07/15 15/01/16 05/06/16

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Figure 2. 700B Line Subsidence.

-0.100

-0.080

-0.060

-0.040

-0.020

0.000

0.020Su

bsid

ence

(m)

Subsidence

08/02/10 06/04/10 17/01/11 04/07/11

30/01/12 06/09/12 21/01/13 25/07/13

20/01/14 14/07/14 08/01/15 02/07/15

20/01/16 07/06/16

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6.1.2 707 Line

The 707 Line was resurveyed on 14 June 2016 .

Subsidence readings for the 707 line were affected by the October 2013 bushfires. It

can be clearly seen that anomalies occur between the survey completed in June

2013, to the survey completed in November 2013 after the fires (12 month survey

following extraction).

Following the trend, maximum subsidence appears less than 30mm. Results from the

survey of the 707 line are presented in Figure 3.

Figure 3. 707 Line Subsidence.

-0.100

-0.090

-0.080

-0.070

-0.060

-0.050

-0.040

-0.030

-0.020

-0.010

0.000

1 6 11 16 21 26 31 36 41 46 51 56 61 66 71 76

Subs

iden

ce (m

)

Subsidence

06/02/13 06/06/1308/11/13 04/12/1326/11/14 02/06/1517/11/15 14/06/16

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6.1.3 609A and 609D Lines

The 609A and 609D lines were resurveyed on 3rd March 2016. Maximum subsidence

is generally consistent with previous surveys. 609A line (or the pegs that still exist) is

virtually the same as last years survey. The 609D line is also virtually the same as

last years survey. Unfortunately, further pegs have been lost due to the ongoing

harvesting operations of the Forestry Corporation. Along the 609A line the following

pegs have been destroyed 60-62, 64-65, 73, 80-98. Plate 1 below shows the extent

of the harvesting.

Plate 1. Clearing of 609A line

Results from the 609A line survey are presented in Figure 4 and results from the 609D line survey are presented in Figure 5.

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Figure 4. 609A Line Subsidence.

-0.12

-0.1

-0.08

-0.06

-0.04

-0.02

0

0.02

0.04

A-132

A-128

A-124

A-120

A-116

A-112

A-108

A-103

A-99A-95A-91A-87A-83A-79A-75A-71A-67A-63A-59A-55A-51A-47A-43A-39A-35A-31A-27A-23A-19A-15A-11A

-7A

-3A

A-2

AA

-6A

A-10

AA

-14

Subs

iden

ce (m

)

Subsidence

28/07/0311/09/0321/01/0404/06/0422/11/0423/02/0525/05/0512/12/05July 200625/01/0728/04/1124/10/1126/03/1226/03/1313/03/1418/03/1503/03/16

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Figure 5. 609D Line Subsidence.

-0.140

-0.120

-0.100

-0.080

-0.060

-0.040

-0.020

0.000

0.020

0.040

D-1

D-4

D-7

D-1

0D

-13

D-1

6D

-19

D-2

2D

-25

D-2

8D

-31

D-3

4D

-37

D-4

0 D-…

D-4

6D

-49

D-5

2D

-55

D-5

8D

-61

D-6

4D

-67

D-7

0D

-73

D-7

6D

-79

D-8

2D

-85

D-8

8D

-91

D-9

4D

-97

Subs

iden

ce (m

)Subsidence

20/12/0511/07/0625/01/0713/05/0810/09/0811/02/0910/11/0919/10/1024/10/1127/03/1202/09/1313/03/1425/03/1503/03/16

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6.1.4 800B Line

The 800B line was resurveyed on 3rd May 2016. Survey results were between +/-

8mm, showing no movement and most certainly within survey error (NB: survey

techniques and equipment should be chosen to achieve 4th order results or better as

defined by ISCM SP 1). The 800B line is situated between the far inbye end of the

810 panel and the Blue Mountains National Park Boundary. This survey represents

18 months since the 810 Panel commenced extraction. Peg 1 is the closest peg to

the National Park (and is within the Newnes Plateau). The results from the 800B line

survey are presented in Figure 6.

Figure 6. 800B Line Subsidence

The results show that there has been no movement near the National Park

Boundary.

6.1.5 800C Line

The 800C line was resurveyed on 4th May 2016. Maximum subsidence was recorded

to be 9mm. The 800C line is situated between the far inbye end of the 812 panel and

the Blue Mountains National Park Boundary. This survey represents 3 months since

the 812 Panel commenced extraction. Pegs 21 – 28 overlie the extracted panel and

-0.100

-0.080

-0.060

-0.040

-0.020

0.000

B1 B2 B3 B4 B5 B6 B7 B8 B9 B10

B11

B12

B13

B14

B15

Subs

iden

ce (m

)

Subsidence

11/02/15 05/05/15

18/11/15 03/05/16

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Peg 1 is the closest peg to the National Park (and is within the Newnes Plateau). The

results from the 800C line survey are presented in Figure 6.

Figure 7. 800C Line Subsidence

The results show that there has been no movement near the National Park

Boundary.

6.2 Cliffline and Pagoda Photographic Monitoring

Detailed inspections and photographic monitoring of the area above the far inbye end

of the 810 - 814 panels and the area adjacent to the National Park was undertaken

on 9th June 2016.

In summary, no surface expression of subsidence was noted during the inspection. If

anything, the inspection continues to show substantial vegetation growth and

recovery in and around the swamp since the pre-mining inspections undertaken in

2014.

ALL GPS co-ordinates were successfully relocated.

The vegetation recovery were consistent across the whole inspection area which

included the Mining Lease boundary and the immediate environs of the Blue

Mountains National Park.

-0.100

-0.080

-0.060

-0.040

-0.020

0.000

C1

C2

C3

C4

C5

C6

C7

C8

C9

C10

C11

C12

C13

C14

C15

C16

C17

C18

C19

C20

C21

C22

C23

C24

C25

C26

C27

C28

Subs

iden

ce (m

)Subsidence

04.05.2016

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7. Environmental Monitoring

Environmental monitoring locations are shown on Plan CL618 (Combined Surface

Monitoring Points) provided in Attachment 1.

7.1 Photographic Monitoring of Newnes Plateau Shrub Swamps

Photographic monitoring was undertaken on 8th June 2016. No evidence of impacts

to the Newnes Plateau Shrub Swamp adjacent to the Mining Lease boundary was

identified.

7.2 Groundwater Monitoring

Groundwater monitoring sites and the relevant areas are outlined in Table 1. The location of all sites is shown on Plan CL618 (Combined Surface Monitoring Points)

provided in Attachment 1. Some sites are for background monitoring purposes only at this stage and are not reported here.

It is noted that CLRP15 and CLRP16 are located either side of the Lithgow No.2 Dam

(Plan CL618) and are used to monitor potential impact on the dam from mining within

the Dam Notification Area.

The most recent download was undertaken on 1st June 2016. Analysis of data from

the most recent download period is summarised in the sub-sections herein.

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Table 1. Groundwater Piezometers at Clarence

Piezometer Installed Area CLRP1 2004 Eastern Area SMP, within 330 Area CLRP2 2004 Eastern Area SMP, above 611E panel CLRP3 2006 Eastern Area SMP, above 612 panel CLRP4 2008 South of mining areas CLRP5 2008 700 Area SMP, north of 700 area panels CLRP6 2008 700 Area SMP, above 702/704 panels CLRP7 2008 700 Area SMP, south of 700 area panels

CLRP10 2008 700 Area SMP, above 706 panel CC113 2008 700 Area SMP, south of 700 area panels CLRP8 Existing bore Clarence Township. Piezo installed 2009 CC114 2009 800 Area SMP Application Area CC115 2009 800 Area SMP Application Area

CLRP11 2010 700 West SMP Application Area CLRP12 2010 700 West SMP Application Area CLRP13 2010 800 Area SMP Application Area CLRP14 2011 800 Area SMP Application Area CLRP15 2011 Lithgow No.2 Dam CLRP16 2011 Lithgow No.2 Dam CLRP17 2013 800 Area SMP Application Area CLRP18 2014 900 Area SMP Application Area CLRP19 2013 800 Area SMP Application Area CLRP22 2014 900 Area SMP Application Area

7.2.1 Open Hole Piezometers

CLRP4, CLRP5, CLRP7, CLRP8 and CLRP10

All groundwater levels (except CLRP4) in the open hole piezometers installed in the

Clarence Aquifer In general, the piezometers continued the broadly level trends they

have showed over time.

Groundwater levels in all of these holes stand at or near historically high levels in the

data record extending back to 2008, related to the generally wetter conditions

between late 2010 and early 2013.

Minor noisy data and distinct small negative spikes in the available record for CLRP8,

in Clarence village, appear to be related to localised pumping of groundwater for

domestic use. CLRP7 shows sporadic spikes related to groundwater sampling,

including during the current period.

Mining impacts:

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CLRP10 was directly undermined by panel 706 (1st workings only) in September

2011. Pillar extraction occurred in panel 708, c. 250 m west of CLRP10, in April

2011. Panel 704, c. 150 m east of CLRP10, was developed in April 2009, with partial

pillar extraction in March 2010. In January and February 2014, pillar extraction

occurred in Panel 700, approximately 700 – 900 m west-southwest of CLRP10.

First workings in panel 902 undermined CLRP5 during December 2013 – January

2014. During the current period, first workings occurred in Panels 909, 9011, and

913, c. 1 km northwest.

There is no evidence of any mining-related impacts on any of these piezometers,

based on the continuing uniform responses of the piezometers. The results from the

open hole piezometers are presented in Figure 8.

Figure 8. Open Hole Piezometer Results

7.2.2 Multi-level Piezometers

CLRP1

All piezometers continue to record data. The data is presented in Figure 9.

There are no indications of any abnormal trends in the available data.

Mining impacts:

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Pillar removal was carried out in Panel 330 immediately to the north of this bore in

late 2004. This resulted in a significant depressurisation of the Katoomba seam, as

measured by piezometer #1. In December 2013, first workings in panel 803 were

developed over 10km to the east. There was no evidence of any permanent mining-

related impacts in the three piezometers higher up in the bore (including the two in

the Banks Wall Sandstone), although piezometer #2 just above the roof of the seam

did show partial depressurisation followed by near-complete recovery. Since that

time there have been no further indications from the data recorded to the present of

any mining-related impacts. Pillar extraction occurred in Panel 803 during July 2014,

with no apparent impact. Pressures recorded in the two Banks Wall Sandstone

piezos remained above pre-mining levels. During the current period, mining occurred

in the 800 area, over 3 km east of the hole, with no discernible impact on

groundwater pressures.

Figure 9. CLRP1 Results

CLRP2

The previous level trend, established over many years, has continued in

piezometer2. Piezometer 3 in the upper sequence maintained its level trend,

following the small rises in pressure, that coincided with the heavy rainfall in mid-April

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2015. Piezometer 4 levelled off the slowly rising trend it has displayed since April

2015. All pressures in the operating piezometers remain above pre-mining levels.

Mining impacts:

Total depressurisation occurred in piezo #1 in the coal seam in August 2007 after

mining below the borehole, as would be expected. The other three piezometers

showed no negative impact from mining at the time, and continue to show no impact

from the mining. Results from CLRP 2 are presented in Figure 10.

Figure 10. CLRP 2 Results

CLRP3

Groundwater interpretation:

The data show a continuation of the level, steady trends recorded previously.

Observations from this hole have shown very little pore pressure movement since

their installation in early 2006. The data indicate that the groundwater level in

piezometer 2 dropped below the installation level in August 2007, and since then

there has been no positive pore pressure readings. This borehole is located on an

exposed steep-sided ridge and it is likely that the groundwater drains quickly from the

strata following rainfall. This explains the lack of any significant response to rainfall

events.

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Mining impacts:

This borehole was undermined shortly after it was installed in 2006, with no mining-

related impacts evident in the data up to the present. Results from CLRP3 are

presented in Figure 11.


CLRP6

There are no data for this installation after 28 July 2014. The cause of the problem is

unclear. Despite several attempts, the piezometer and data cannot be recovered.

This piezometer is located above 702 panel which was extracted in 2009. The 700

Area SMP has also expired. Other piezometers will continue to monitor the aquifers

above the mining area. Clarence will seek to remove this piezometer from the

monitoring set.

Mining impacts as at the latest download:

Partial extraction occurred in Panel 702 in September 2009 directly beneath this

borehole, and the adjacent Panel 704 was partially extracted in December 2009. First

workings in Panel 706, 250 m to the west, were driven during February 2012. During

the current period mining occurred c. 2 km to the north. There is no evidence from

the available data of any adverse mining-related impacts on the strata containing the

two functional piezometers during any of the mining.

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CLRP15

Available data indicate that pore pressure in the Burra-Moko Head Sandstone (piezometer 1),

though declining slowly, has remained above the Lithgow No. 2 Dam FSL, so that

groundwater flow in this unit was towards the dam storage. Piezometer 1 is located lower in

the section than piezometer 2, thus closer to the mining horizon. The lack of any response in

piezo #1 indicates that the variability in piezometer 2 that was observed is highly unlikely to

be due to mining.

Available data from piezometer 2 showed a generally slowly-rising pressure trend, although

with irregular variations, followed by an irregularly falling trend, albeit with sporadic data, since

late 2014. Over the current period, the trend was level, following a steady rise in previous

periods.

Piezometers 3 and 4, installed in the Banks Wall sandstone, have shown no significant

changes in their broadly level trends.

In addition to the multilevel piezometer array, a conventional aquifer piezometer was installed

in an open hole at the same site. Data from this piezometer are downloaded every two

months; data are available for the current period. The data showed a constant groundwater

level, just above the FSL of Lithgow 2 Dam, until mid-June 2014. At that time the data

suddenly showed a rise in water level of some 20 m, followed by continued flat trends at the

new level. The reason for this is unclear. A bench test of the instrument showed it was

recording pressures reliably. An additional instrument was deployed, and showed similar

results, indicating that the observed trend is unlikely to be an instrumental error. As well,

temperature data are consistent across the pressure change, suggesting no significant

change in hydrogeological conditions. The reason for the change in pressure remains

unclear, although caving into the hole is suspected. However, the level trends, both before

and after the baseline reset, are consistent, and suggest that the water level in this hole is

controlled by the water in the reservoir, with flow towards the reservoir.

Since CLRP15 is located between the reservoir and the mine workings, the presence of a

flow direction towards the dam is significant. This situation represents the normal pre-mining

hydrogeological regime, and indicates that mining has had no impact on the groundwater

regime between the dam and the mine workings.

Mining impacts:

First workings in 707 panel were about 250 m east of the borehole at the end of July 2012,

and partial extraction was completed in August 2012. Pillar extraction in panel 716

approached to within c. 750 m during August – September 2013. During the period, mining

occurred at c. 4 km distance to the north, in Panels 909, 911, and 913. The level trends and

evidence of flow towards the reservoir indicate that there is no recognisable impact from

mining.

Results presented in Figure 12 also include the data from the open hole piezometer situated next to the multi-level piezometer.

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CLRP16

Piezometer 2, located just above the level of the reservoir thalweg at the dam, has

been slowly declining since mid-February, most probably due to prevailing dry

weather conditions.

Piezometer 1, located in the cover sequence approximately 35 m above the level of

the mine workings, shows a slowly declining pressure trend, in fragmentary data,

similar to trends seen previously. The head measured by piezometer 1 remains well

above the values seen in the overlying piezometer. The overall pressure trend does

not appear to be natural. It is possible that there are instrumental effects in these

data or that the instrument has failed. As borehole CLRP15 is closer to the workings,

and has not shown this effect, it is highly unlikely to be due to mining impacts.

Mining impacts:

Pillar extraction in 716 panel was more than 1 km northeast of the borehole in August

– September 2013. Pillar extraction in 700 Panel occurred over 1.8 km m the east

during March 2014. Mining in Panels 909, 911, and 913 during the period was 4 km

to the north. There is no evidence of mining impact in the groundwater record.

Results from the piezometer are presented in Figure 13.

0

20

40

60

80

100

120

850

900

950

1000

1050

1100

Rai

nfal

l (m

m)

Red

uced

Lev

el (m

)Clarence Colliery

Figure 15 - CLRP15 piezometer data

rainfall

Piezo #4 - 60 m

Piezo #3 - 90 m

Piezo #2 - 130 m

Piezo #1 - 160 m

Aquifer Piezo

period

#3

Borehole collar RL 1113.15 m

Katoomba seam roof

#2

#1

#4

Inst

all

leve

l

L#2 Dam FSL

Mount York Claystone

L#2 Dam thalweg

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CC114

Previously observed trends continued with piezometers 1 and 2 showing a generally

flat trend.

Piezo #4 had shown negative pressures since January 2010, but rose in May 2012

and produced positive pore pressures for the first time in more than two years. The

pore pressures have since declined slowly, and remain slightly negative until early in

2016. Since then, the piezometer has shown pressures that are mainly slightly

positive. Negative pressures indicate that the piezometer is dry. The dry condition

has previously been ascribed to lower-than-average rainfall. However, it may also be

in part due to the topographic location of this installation, analogous to CLRP3,

situated on the edge of the deeply-incised Wollangambe Creek gorge. The elevated,

exposed nature of the upper part of the section may allow fairly easy drainage of

groundwater.

Piezometer 3 maintained the very slowly declining trend observed previously, but the

variable “noisy” nature of the data suggests that this may not be a reliable instrument,

especially given that the pressure is higher than in the overlying piezometer 4.

There are no indications of any abnormal trends in the available data.

Mining impacts:

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During the period, first workings and pillar extraction occurred in the 800 area, 3 – 4

km to the east. There is no indication of mining impact in the data.

There is no indication of mining impact in the data. Results from CC114 are

presented in Figure 14.

Figure 14. CC114 Results

CC115

Trends in the data after repair are broadly consistent with those seen previously,

although at lower absolute levels than before. The difference in pressure heads are

30 – 50 m, which is highly unlikely to be a real groundwater phenomenon. The most

likely reason is a calibration difference between the old and new data loggers. This

should be reviewed by the data logger installers.

All piezometers showed trends consistent with previous behaviour.

Piezometer 1 is located approximately 13 m above the Katoomba seam working

horizon. It showed steady pressure trends throughout almost the entire data record,

but suddenly declined asymptotically by 11 m after reconnection. The steep decline

seen in recent data slowed to an asymptotic curve, which levelled off, before

commencing a slowly rising trend.

Piezometers 2, 3, and 4 showed level trends. Piezometers 2 and 3 continue to show

very similar pressures, suggesting that the piezometers may be hydrogeologically

connected.

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All piezometers show very minor perturbations in trend in late May 2016. These

consist of drops in pressure head of a few meters over this time, with partial

recovery. The perturbations coincide with mining directly under the site (see below).

There are no indications of any abnormal effects in the available data, indicated by

the consistent trends in these records, and subject to the comments above about

calibration. The bushfire does not appear to have had any observable impact on the

groundwater record at this location. This was expected.

Mining impacts:

In late May 2016, the borehole was directly undermined by pillar extraction in Panel

812. The small but distinct drop and recovery in the piezometers are mining impacts.

It is notable that pressure has totally or partially recovered in each piezometer. No

instruments showed a drop to negative values, and the upper strata have not been

affected by development of a permeability connection to the workings. The

movements are mining-induced, and according to expectations. They have not had a

significant or permanent impact on the groundwater system.

Results are presented in Figure 15.

Figure 15. CC115 Results

CLRP17

The available data show steady trends with positive groundwater pressures, and continue

trends seen previously.

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The two available piezometers show very steady, level positive pressure trends.

Mining impacts:

Mining in the 800 area was over 0.8 km from the piezometer. The very slow decline in the

lower piezometers may be due to stabilisation of the piezometers after installation, or may be

(and is most likely to be) a reflection of gradual dewatering of strata as a result of mining first

workings. The steady, level trends in the uppermost piezometer indicate that there has been

no dewatering in the near-surface aquifer. There is no evidence of significant mining impact in

the groundwater record.

Monitoring results for piezometric height at CLRP17 is presented in Figure 16.

Figure 16. CLRP17 Piezometric Height

CLRP19

The data previously showed a very slow decline in pressure in piezometer #1, and

similarly slow increases in pressure in piezometers 2 and 3, which then levelled off to

stable trends before slowly declining again. Previous pressure trends continue in the

available data.

In Piezometer 1, installed approximately 100 m above the working horizon but below

the Mount York Claystone, the pressure trend was initially level, with a head that lies

near the top of the Mount York Claystone (the regional aquiclude). The coincidence

suggests that this is a confined aquifer with no significant leakiness or formation

damage in the cap rock, which is controlling pressure in the underlying aquifer. As

this piezometer is installed in a low permeability unit, pressures can take some time

0

20

40

60

80

100

120

800

850

900

950

1000

1050

Rai

nfal

l (m

m)

Red

uced

Lev

el (m

)

Clarence CollieryFigure 17 - CLRP17 piezometer data

rainfall

Piezo #3 - 70 m

Piezo #2 - 170 m

Piezo #1 - 200 m


period

#3

Borehole collar RL 1047.98 m

Katoomba seam roof ↓ 771 m RL

#2

#1

Inst

all

leve

l

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to dissipate, possibly explaining that the slow decline may have been due to gradual

stabilisation of the borehole after installation.

Mining impacts:

Pillar extraction took place immediately below the piezometer site during March

2016. The data show no impact from mining. The slow decline in piezometer 1 is

most likely due to slow stabilisation after installation, and does not appear to be an

impact caused by mining.

Monitoring results for piezometric height at CLRP19 is presented in Figure 17.


CLRP14

Piezometers 1, 2, and 4 continue the level trends displayed previously.

The lowest piezometers show similar stable pressure trends. The similarity of

pressure previously observed in piezometers 1 and 2 up to late 2013 suggested that

the instruments were in hydrogeological continuity. However, since early 2014 these

pressures started to diverge, with this trend continued in the current dataset.

The uppermost piezometer 4 shows a level trend. Piezometer 4 commenced

producing more stable data, although, for a few days after 19 August 2014, the

pressure head varied by up to 1 m daily. The cause of this anomalous behaviour is

unclear, but it is transient, unprecedented, and likely to be non-significant.

Mining impacts:

0

20

40

60

80

100

120

800

850

900

950

1000

1050

Rai

nfal

l (m

m)

Red

uced

Lev

el (m

)

Clarence CollieryFigure 19 - CLRP19 piezometer data

rainfall

Piezo #3 - 90 m

Piezo #2 - 120 m

Piezo #1 - 170 m


period

#3

Borehole collar RL 1010 m

Katoomba seam roof ↓ 739 m RL

#2

#1

Inst

all

leve

l

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Pillar extraction in the 800 area has occurred previously under the piezometers; first

workings were 2 km east. The available data record shows no mining impact.

The data record shows no mining impact. Results are presented in Figure 18.


CLRP22

Trends observed previously continue in the available data. Piezometer 1, installed

approximately 100 m above the working horizon but below the Mount York Claystone, has

stabilised after a very slowly rising pressure trend, with pressure that lies near the top of the

Mount York Claystone (the regional aquiclude). The coincidence suggests that this is a

confined aquifer with no significant leakiness or formation damage in the cap rock, which is

controlling pressure in the underlying aquifer.

Piezometer 1, installed approximately 100 m above the Mount York Claystone, showed a

level trend.

Mining impacts:

The nearest mining during the period was 3 km southwest of the installation. Old

workings lie 400 m+ to the east. There is no indication in the current data of any

mining impact.

The data record shows no mining impact. Results are presented in Figure 19.

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7.3 Surface Water Monitoring

Results from the surface water monitoring at Farmers Creek indicate no adverse

impact from mining on surface water quality.

7.4 Flora Monitoring

Flora monitoring fieldwork for Clarence Colliery is undertaken by Roger Lembit of

Gingra Ecological Surveys. Fieldwork is undertaken three times per year – autumn,

spring and summer.

7.4.1 Outbye Area

Four vegetation monitoring quadrats were established within the heath vegetation in

the Outbye Area. There were also two control sites (Table 2).

Table 2. 700 Area Heath/Pagoda Flora Monitoring Sites (Eastern and 700 Areas)

Site Location Easting

(MGA)

Northing

(MGA)

CLAO 01 Above 307 south of Bungleboori 245023 6297763

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Creek

CLAO 02 Above 307 south of Bungleboori Creek

245092 6297707

CLAO 03 Above 402, north of Bungleboori Creek (completed June 2009)

245504 6298627

CLAO 04 Adjacent to 602, north of Bungleboori Creek (completed

April 2009)

245294 6299168

PAG05 (C) North of Waratah Ridge 247962 6303960

PAG06 (C) North of Waratah Ridge 247888 6303910

Note: (C) denotes control site

Isopogon anemonifolius plants had some dead branches at CLAO_02. Borer damage

on Allocasuarina nana plants was observed at CLAO_03.

These observations were consistent with natural patterns of plant heath given the

seasonal conditions and time since fire.

No exotic species were recorded at any of the Clarence Outbye sites in autumn

2016.

A number of new post fire records of species within Outbye monitoring plots were

made in summer 2016.

These included:

Thelionema caespitosum at CLAO_01

Boronia floribunda at CLAO_02

Pimelea linifolia at CLAO_02

Rytidosperma sp. at CLAO_02

Gompholobium sp. at CLAO_03

Pimelea linifolia at CLAO_03 and CLAO_04

Epacris microphylla at CLAO_04.

There are no clear long term trends indicating a change in abundance of the more

common shrub or ground layer species present at each site.

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7.4.2 700 Area and Eastern Area

A total of six sites in the Eastern area (with two control sites) and two sites in the

Clarence 700 West area (with one control site) were monitored (Table 3).

Table 3. 700 Heath/Pagoda Flora Monitoring Sites (Eastern and 700 West Areas)

Site Location Easting (AMG)

Northing (AMG)

Clarence East

PAG01 Gorilla Rock 246648 6299845

PAG02 Gorilla Rock 246650 6299734

PAG03 Waratah East 247146 6300517

PAG04 Waratah East 246938 6300594

PAG05 (C) Waratah North 247857 6303770

PAG06 (C) Waratah North 247783 6303720

Clarence West (700 Area)

CLW01 Heath 241669 6295394

CLW06 (C) Heath - Paddy’s Creek ridge

240367 6298981

Note: (C) denotes control site

Monitoring surveys involved recording vegetation structure, dominant species,

estimated cover and height for each stratum, full floristics, estimated cover

abundance for each species using a modified Braun-Blanquet scale and condition

ranking for plant species using a five point scale. Observations of general condition

of vegetation in less sensitive forest and woodland habitats were also recorded.

Species richness within quadrats in autumn 2016 was within the previously recorded

range at the unburnt sites. At burnt sites species richness in autumn 2016 was at the

upper end of the post-fire range.

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Species richness over the last 24 months has been greater than the average levels

recorded in the nine years prior to the fire. This is consistent with response to fire in

this type of habitat.

The only instance of a record for an exotic plant species at pagoda and heath sites

was a single Catsear (Hypochaeris radicata) plant observed in spring 2010 at

PAG_04.

No exotic species were recorded at any of the Clarence East and West sites in

autumn 2016.

There was no evidence of death or dieback which could be attributed to an effect of

subsidence.

7.4.3 800 Area

Plants were in good condition and continued to show a vigorous post fire recovery

response. Leaf predation of Hakea laevipes plants was observed at CLAE_02. Leaf

dieback of Lepidosperma viscisum plants was observed at CLAE_03. Minor dieback

of Dampiera stricta plants was observed at CLAE_05. Leaf miner damage was

observed on Olearia quercifolia plants at CLAE_06 and CLAE_08.

The number of records in summer 2016, 328, exceeded previous species richness

totals for the Clarence East site. In autumn 2016 there was a similar level (327

records) of species richness. This reflects ongoing post fire recovery and the

presence of species such as orchids and lilies which have low detection rates when

not flowering.

There have only been two records for an exotic species at the 800 area sites since

monitoring commenced. Fleabane (Conyza sp.) was recorded as rare at CLAE_08 in

summer 2010 and Yorkshire Fog (Holcus lanatus) was recorded as rare at CLAE_08

in autumn 2012. Disturbance associated with damage by feral pigs was recorded in

proximity to this site in April 2009.

There have been no subsequent records of exotic species at any of the 800 area

sites. The bare ground layer evident at the sites following the bush fire did not lead to

any new weed occurrences, even in the Olearia Swamp sites which had been

affected previously by feral pigs.

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7.4.4 900 Area

Two sites were established along an arm of Paddys Swamp in the Clarence 900 area

in November 2014. This area was affected by the October 2013 bushfire. The two

sites are presented in Table 4.

Table 4. 900 Area Flora Monitoring Sites

Site Location Easting

(MGA)

Northing

(MGA)

PSB 01 Paddys Swamp Branch 241338 6298523

PSB 02 Paddys Swamp Branch 241404 6298617

Species richness at both PSB_01 and PSB_02 was within the range recorded in

autumn and spring 2015 reflecting the stage of recovery from the October 2013 bush

fire.

Four Phyllota squarrosa plants at PSB_01 were dead, possibly due to post fire

competition. No signs of plant disease were observed at PSB_02.

One exotic species, Catsear (Hypochaeris radicata) has regularly been recorded at

PSB_01 and in autumn 2016 this species was rare.

Catsear was also recorded at Site PSB_02 in spring 2014, but has not subsequently

been recorded at the site.

The rare grass, Notochloe microdon, has regularly been recorded at PSB_02 with a

cover/abundance score of 2 (uncommon) in autumn 2016.

There are a range of disturbance factors already operating in the vicinity of these two

sites. This includes drainage works associated with the abandoned sand mine 600

metres to the south, a trail bike track to the north of PSB_01 and the impacts of the

2013 bush fire.

7.5 Fauna Monitoring

Fauna monitoring at Clarence Colliery is undertaken by Biodiversity Monitoring

Services. Fieldwork commenced in 2004 and is undertaken 3 times per year –

autumn, spring and summer.

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7.5.1 800 Area

The area is within ML 1583 and is termed the ‘Area 800’. An initial fauna survey was undertaken in March 2009 and three sites were established in Area 800. The sites are:

800 Swamp 1 Site samples Newnes Plateau Shrub Swamp in the central part of the 800 Area.

800 Heath Site samples Montane heath vegetation south of Dumbano fire trail.

800 Swamp 2 Site samples the woodland and gully vegetation in the eastern part of the 800 Area.

Selection of these areas complement flora and fauna survey sites elsewhere across the Clarence Colliery area. Existing control sites would be suitable as control sites for these new sites. These three sites are mapped in Figure 20, together with other fauna survey sites currently monitored within Clarence Colliery.

Figure 20. Location of Fauna Monitoring Sites in 800 SMP Area

A total of 24 bird, six native mammal (plus four introduced mammal), five reptile and

one amphibian species were located during the surveys.

The fauna monitoring survey of Area 800 in autumn 2016 has shown that the choice

of survey sites was successful, in terms of the number of individuals and diversity of

species within the main fauna groups surveyed. Also, there were sufficient numbers

and diversities of these fauna groups to be able to calculate a set of diversity indices

that form part of the baseline monitoring database as there have been no mining

activities in the area to date. However, as with that found in previous years, reptile

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and amphibian numbers and diversity were low, possibly due to the colder overnight

temperatures. Similar to autumn 2015, no threatened species were located.

Analysis of the data for autumn 2009 to 2016 shows how the State Mine fire has

impacted upon the habitat characteristics and biodiversity indices. From 2012

onwards the indices have declined as the survey sites show the effects from the loss

of vegetation and the high temperatures during the fire. The loss of vegetation would

have influenced the amount of shelter and food available, not only at the time of the

fire, but continuing for years afterwards. As the area regenerates it is expected that

the biodiversity indices will start to move towards their pre-fire values. Signs of

recovery in the animal populations and habitats were beginning to be recorded in the

2015 surveys and continued into 2016.

Further monitoring is recommended to provide accurate baseline and comparison

data. This should be undertaken during three seasons of the year (autumn, spring

and summer) to ensure natural variability of fauna populations are taken into

consideration.

7.5.2 900 Area

With the expansion of mining into Area 900 at Clarence Colliery it is necessary to

monitor fauna populations within the area, particularly within any swamps considered

as Endangered. Two sites have been selected in the north and south of the area and

their locations are shown in Figure 21.

Site A North is located along Paddys Creek, a tributary to Bungleboori Creek. The

site covers the creekline and surrounding woodland and low heathy shrub. Along the

western edge of the site is a cliffline about 50 m high. The site was burnt in the 2013

State Mine fire and the vegetation is still recovering. Consequently, little of the

original shrub cover exists at present. The burnt remains of a pipeline run beside the

creek, possibly connected with the nearby quarry. The creek was flowing strongly

during the survey. Site A North sampled land above Panel 917.

Site B South is also located along Paddys Creek, but further towards the headwaters.

The site covers the creekline and associated riparian area, as well as the

surrounding woodland. At the time of the survey water in the creek was slowly

flowing and there were a series of small water holes in the area. A deep trench had

been dug beside the creek, presumably to drain the area. The site was burnt in the

2013 State Mine fire and the vegetation is still recovering. Consequently, little of the

original shrub cover exists at present. The burnt remains of a pipeline run beside the

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creek, possibly connected with the nearby quarry. Site B South sampled land above

Panel 913.

Figure 21. Location of Fauna Monitoring Sites in 900 SMP Area

A total of 34 bird, seven native mammal (bat data not included), one introduced

mammal and two reptile species were located during the surveys.

The fauna monitoring survey of the 900 Area i.e. panels 913 and 917, has shown that

the choice of survey sites was successful, in terms of the number of individuals and

diversity of species within the main fauna groups surveyed. Also, there were

sufficient numbers and diversities of these fauna groups to be able to calculate a set

of diversity indices that form part of the baseline monitoring database. However, as

with that found in other sites within Clarence Colliery that have been affected by the

2013 State Mine fire, fauna numbers and diversity were low, particularly concerning

mammals. It is anticipated that populations will build up over time. Three threatened

species were located during the surveys, the Gang-gang Cockatoo, Flame Robin and

Eastern Pygmy-possum. Some threatened bat species may also occur, but the

analysis is not complete. It is encouraging that the blossom eating pygmy-possum

has found a home in the area, indicating an ability to colonise disturbed areas.

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The values of the habitat characteristics and the Habitat Complexity Scores reflect

the effects from the State Mine fire. Most values are low for each site and this is

particularly seen in the tree and tall shrub cover which are very low for shrub swamps

and woodland habitats. It is anticipated that these values will increase over time.

Given the low levels of subsidence from previous mining at Clarence Colliery, and

the predicted low levels (30mm) of subsidence for the 900 Area, the risk of adverse

impacts on fauna within this area is considered to be low.

7.5.3 Outbye Area

Three sites surveyed in Autumn 2016 have been established within the Outbye SMP

Area including (Figure 22):

Heath North (Site 1) – Sandstone Plateaux Tea Tree – Dwarf Sheoak – Banksia Rock Heath Sandstone Plateau and Ridge Scribbly Gum Silvertop Ash Shrubby Woodland;

Gully (Site 2) – Pagoda Rock Sparse Shrubland and Newnes Sheltered Peppermint – Brown Barrel Shrubby Forest; and

Heath South (Site 3) - Exposed Blue Mountains Sydney Peppermint – Silvertop Ash Shrubby Woodland.

Eight native mammal (plus two introduced), thirty-four bird, two reptile and one

amphibian species were recorded from the Outbye area.

The choice of survey sites was successful, in terms of the number of individuals and

diversity of species within the two main fauna groups surveyed. Also, there were

sufficient numbers and diversities of these fauna groups to be able to calculate a set

of diversity indices that form part of the baseline monitoring database. No

threatened species were located during the autumn surveys. The lack of flowering

shrubs and possibly other food sources may have deterred this group of rare species

from utilizing the previously burnt area.




of vegetation and the high temperatures during the fire. The loss of vegetation would

have influenced the amount of shelter and food available, not only at the time of the

fire, but continuing for years afterwards. As the area regenerates it is expected that

the biodiversity indices will start to move towards their pre-fire values.

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Figure 22. Location of Fauna Monitoring Sites in Outbye SMP Area

Given the low levels of subsidence from previous mining at Clarence Colliery, and

the predicted low levels (100mm) of subsidence for the Outbye SMP Area, the risk of

adverse impacts on fauna within this area is considered to be low. At this stage,

there is no evidence of any impacts upon terrestrial vertebrate fauna in the Clarence

Outbye SMP Area from mining activities.

7.5.4 700 Area

Three fauna monitoring sites established within Clarence Colliery 700 Eastern SMP Area were sampled during the autumn 2016 monitoring surveys, see Figure 23. These sites are described as:

BNS02 (Bungleboori North 1) – a swamp located within the (now freshly cleared) pine forest east of Waratah Ridge Road. The swamp supports a mix of Newnes Shrub Swamp and Blue Mountains Sandstone Plateau Forest.

PAG01/02 – a pagoda and steep hill overlooking Bungleboori Creek. This site samples Pagoda Complex and Blue Mountains Sandstone Plateau Forest vegetation, as well as habitats unique to the cliffline environment.

PAG03/04 – a pagoda and steep hill overlooking Bungleboori Creek, similar to PAG01/02.

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Figure 23. Location of Fauna Monitoring Sites in 700 Eastern SMP Area

The timing of the survey was successful, in terms of the number of individuals and diversity of species within the three main fauna groups surveyed. Also, there were sufficient numbers and diversities of the fauna groups to be able to calculate a set of diversity indices that form part of the baseline monitoring database. There is now sufficient data accumulated to provide annual population estimates for all groups of fauna.

Analysis of the data for autumn 2008 to 2016 shows how the State Mine fire has impacted upon the habitat characteristics and biodiversity indices. From 2013 onwards the indices have declined as the survey sites show the effects from the loss of vegetation and the high temperatures during the fire. The loss of vegetation would have influenced the amount of shelter and food available, not only at the time of the fire, but continuing for years afterwards. As the area regenerates it is expected that the biodiversity indices will start to move towards their pre-fire values. Three of the species located are listed as Vulnerable under the NSW Threatened Species Conservation Act (TSC Act). These were all bats - Large-eared Pied Bat, Eastern Bent-wing Bat and Eastern False Pipistrelle.

It is now more than eight years since mining occurred above or adjacent to the

Eastern SMP sites. Seasonal fauna monitoring during this period has not detected

any mining related impacts.

7.5.5 700 West Area

All six monitoring sites were sampled during the autumn survey. These sites sample

pagoda complexes and swamps within the western SMP area (which incorporates

the approved 700 Area) of Clarence Colliery. Three of the sites sample land where

no underground mining has occurred (control sites) and three sites sample land

where partial extraction has occurred (treatment sites). Figure 24 depicts the spatial

location of the sites. A description of the sites is provided below:

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CLW01 – Control site, not undermined, pagoda landscape;

CLW02 – Undermined November 2009, swamp landscape;

CLW03 – Undermined October 2010, swamp landscape;

CLW04 – Control site, not undermined, swamp landscape;

CLW05 – Control site, not undermined, swamp landscape; and

CLW06 – Undermined November 2011, pagoda landscape.

Figure 24. Location of Fauna Monitoring Sites in 700 Western SMP Area

Ten native mammal (plus five introduced), 40 bird, three reptile and three amphibian

species were recorded from the Western SMP area.

The Western SMP Area of Clarence Colliery consistently provides relatively high

species diversities and population numbers. The results from the survey carried out

in autumn 2016 showed good results despite the cold weather and the effects from

the State Mine fire. At this stage there are no significant differences in the habitat

values and fauna assemblages over the years or between the treatment and control

sites for both the pagoda and swamp environments. Three threatened species were

recorded, the Varied Sittella, Turquoise Parrot and Flame Robin (bat identification

still to come).




of vegetation and the high temperatures during the fire and possibly from low rainfall

in this period. The loss of vegetation would have influenced the amount of shelter

and food available, not only at the time of the fire, but continuing for years afterwards.

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As the area regenerates it is expected that the biodiversity indices will start to move

towards their pre-fire values. This is starting to be seen in the Habitat Complexity

Scores.

It was possible to assess any differences in the biodiversity and habitat condition of

the control and the treatment sites within pagoda and swamp habitat. This

comparison showed that there are no significant differences in the biodiversity and

habitat complexity. At this stage, the control and treatment sites have similar

characteristics, in terms of biodiversity and habitat complexity and there is no

indication that any mining has affected fauna populations

7.6 Cliff Line and Pagoda Photographic Monitoring

There was no indication of any surface subsidence during the period. All GPS co-

ordinates were successfully relocated. In respect of the 800 Area inspection, there

was again, substantial vegetation growth making direct replication of photo sites

challenging.

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8. Adequacy, Quality and Effectiveness

The partial extraction system at Clarence Colliery has been monitored during the

design, development, and extraction phases to ensure the necessary dimensions of

the system are maintained and regularly independently audited by Golders.

All subsidence monitoring results are generally below the 100mm maximum

predicted.

Surface inspections found no evidence of any cracking or subsidence related surface

impacts.

Subsidence and environmental monitoring has been adequate in measuring the

impacts of the partial extraction system. Subsidence monitoring has demonstrated

trends in ground movement associated with pillar compression due to the partial

extraction.

Subsidence management within each SMP Area has been effective in protecting

surface features (including clifflines and pagodas), surface infrastructure, surface

water, upper aquifers, Newnes Plateau Shrub Swamps/Newnes Plateau Hanging

Swamps, flora and fauna.

There has been no adverse impact on the upper aquifers, swamps or baseflows to

swamps detected as a result of mining activities.

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9. Proposed Management Actions

During the next reporting period the following subsidence management activities are

proposed:

Resurvey of the U Line (Annual);

Resurvey of the Lithgow No. 2 Rack Markers (Final);

Resurvey of the Lithgow No. 2 Dam Wall (Final);

Resurvey of the 900A Line (Annual);

Resurvey of the 800C Line (6 months post extraction 812 panel);

Resurvey of the 800D Line (3 months post extraction 814 panel);

Resurvey of the 800A Line (3months post extraction 812 Panel);

Resurvey of the W and Z Lines;

Resurvey of the 700F Line;

Resurvey of the 903 Line;

Continue with flora, fauna, groundwater and monitoring;

Surface inspection of the far inbye end of 810, 812 and 814 panels including

areas within the National Park;

Review and amend the 900 Subsidence Monitoring Program (in line with the

recent changes to the panel orientations);

Submission of the 800 Subsidence Monitoring Program for 808 and 816

panels (updating the 810, 812 and 814 subsidence monitoring programs)

Continue surface water monitoring for Farmers Creek upstream and

downstream;

Continue with underground mining system audits (in-panel and end of panel);

Submission Quarter 2 report and request for cessation of monitoring in

accordance with Dams Safety Committee approval conditions for mining (first

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workings and partial extraction) within the Lithgow No.2 Dam Notification

Area. All approvals have now expired.

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10. Conclusion

Subsidence and environmental monitoring has been carried out generally in

accordance with the relevant Subsidence, Infrastructure, Public Safety and

Environmental Monitoring Programs required under the various SMP and Clause 88

approvals. Mining systems have been implemented as planned.

No subsidence impacts have been observed by the management of Clarence

Colliery in the reporting period. No surface cracking has been detected and there has

been no adverse impacts detected on surface water, upper aquifers, swamps, flora

or fauna.

From the last reporting period there has been no need for early response or

emergency procedures to ensure adequate management of potential subsidence

impacts.

Attachment 1: Plans

Page intentionally left blank

SUBSIDENCE

LINES

611A,B,C PANELS

612 & 614 PANELS

330 PANELS

611D,E PANELS

609 PANELS 605 PANEL

302 PANEL

402 PANEL

307 PANEL

PANEL 700 'A' LINE

700 PANEL 'B' LINE

700 PANEL 'C' LINE

POWER POLES

700 PANEL 'D' LINE

700 PANEL 'E' LINE

WORKINGS

14.07.2016

AS SHOWN (1:12,000)

DRG. No.

DATE

SCALE

REFERENCE

EXTRACTION

N:\SHARED\PLANS\SUBSIDENCE\

SMP_REPORT\ALL_SUBSLINES

CL556

PLAN SHOWING SUBSIDENCE MONITORING AND

CURRENT WORKINGS AT 30.06.2016

Centennial Coal

Clarence

THIS DRAWING IS THE PROPERTY OF CLARENCE COLLIERY PTY. LTD.

707 PANEL

PANEL 716 'F' LINE

COLLIERY HOLDING

900 AREA 'A' LINE

800 AREA 'A' LINE

810 PANEL 'B' LINE

812 PANEL 'C' LINE

900 AREA '903' LINE

PANEL 814 'D' LINE

N 6 301 000

N 6 302 000

N 6 300 000

N 6 299 000

N 6 298 000

N 6 297 000

N 6 296 000

E 2

48

0

00

E 2

47

0

00

E 2

46

0

00

E 2

45

0

00

E 2

44

0

00

N 6 295 000

N 6 294 000

E 2

43

0

00

E 2

42

0

00N

F LINEREMOVEDX LINE

REMOVED

H LINE

I LINE605 LINEdecommissioned

ROCKMARKS

ROCKMARKS

R LINEdecommissioned

S LINEdecommissioned

T LINEdecommissioned

V LINEdecommissioned

E LINEdecommissioned

C LINEREMOVED

B LINEREMOVED

D LINElevels only

A LINElevels only

A LINElevels only

ROCKMARKS

700A LINElevels only

700B LINElevels only

700C LINEPOWER POLES

decommissioned

Y LINE

700DLINE

decommissioned

700ELINE

decommissioned

G LINEREMOVED

W LINE

Z LINE

U LINE

707 LINElevels only

700F LINElevels only

A110

A105

A

1

0

0

A115

A90

A95

A85

A75

A70

A

5

2

/

B

1

5

B1

A60

A65

A55

B5

B30

B20

B40

B52

C10

C5

C1

C15

C20

C25

C30

C35

D55

D1

A15

D5

D10

A20

D15

D20

D25

A30

A25

A35

A40

D35

D

4

3

/

A

4

4

D30

D40

A45

D50

E85

E95

E90

E60

E30

E45

E55

E50

E40

E35

E80

E75

E65

A130

A120

A125

D95

D85

D90

D60

D65

D80

D75

B50

D70

E-10

E15

E1

E25

E20

A1

A5

A10

AA5

AA10

AA15

F1

F10

F20

F30

F40

F50

F60

F70

F80

G10

G20

G15

G25

G30

G40

G35

G50

G45

G60

G65

G70

G75

G80

G85

G90

G95

G100

G105

G110

G115

G125

G128

F92

I-1

I-5

I

2

8

/

H

3

2

H59

H60

H60A

H61

H61A

H62

DDH26

H63

612-1

612-2

612-3

612-4

612-5

612-6

612-7

612-8

612-9

612-10

H64A

H64

H65A

H65B

H65

H65C

H1

H40

H58

F90

X70

X1

X60

X50

X40

X30

X20

X10

R1

S

6

3

/

R

3

1

S128

R60

S1

S10

S20

S30

S40

S50

S60

S70

S80

S90

S100

S110

S120

R10

R20

R40

R50

BM-R0

61107

611B-06

611B-07

611B-08

611B-05

611B-04

611B-01

611B-02

611B-03

V55

V1C

V1

V10

V

3

0

/

T

7

6

V20

V40

V50

T50

T40

T60

T30

T20

T10

T1

T70

T80

T90

T100

T110

T120

T130

T139

F5

F15

F25

F35

F45

F55

F65

F75

F85

X5

X15

X25

X35

X45

X55

X65

H45

H50

H55

H5

H10

H15

H20

H25

H30

H35

T5

T15

T25

T35

T45

T55

T65

T75

T85

T95

T105

T115

T125

T135

V5

V15

V25

V35

V45

S5

S125

S115

S105

S95

S85

S75

S65

S55

S45

S35

S25

S15

R55

R45

R35

R30

R25

R15

R5

CW-6

CW-5

CW-4

CW-3

CW-2

CW-1

I-10

I-15

I-20

I-25

I-30

I-35

I-40

I-45

I-50

I-55

I-60

I-65

R98

R95

R90

R85

R80

R75

R70

R65

605-3

605-4

605-5

605-6

605-7

605-8

605-9

605-10

605-11

605-12

605-13

605-1A

605-1B

605-2A

605-2B

U1

U5

U15

U30

U65

U25

U40

U45

U50

U55

U60

W1

W5

W

9

Z15

W15

W18

W25

W30

W35

W40

W45

W50

W55

W60

W65

W80

W85

W90

W95

W115

W120

W130

Z

-

1

0

Z1

Z

5

W10

W20

U20

U35

U10

D45

A50

B25

B35

B45

D98

E5

E70

E99

A80

B10

W70

W75

G120

G65

G5

G1

W100

W105

W110

W82A

W106A

W125

700A1

7

0

0

A

5

7

0

0

A

1

0

7

0

0

A

1

5

7

0

0

A

2

0

7

0

0

A

2

5

7

0

0

A

3

0

7

0

0

A

3

5

7

0

0

A

4

0

7

0

0

A

4

5

7

0

0

A

5

0

7

0

0

A

5

5

7

0

0

A

6

0

7

0

0

A

6

5

7

0

0

A

7

0

7

0

0

A

7

5

7

0

0

A

8

0

7

0

0

A

8

5

7

0

0

A

9

0

7

0

0

A

9

5

STN-B1

STN-B7STN-B11

STN-B89

C-MB1

C-MB2

C-MB3

C-MB4

C-MB5

C-MB6

C-MB7

C-MB8

C-MB9

C-MB10

C-MB1SL

C-MB1SR

C-MB2SL

C-MB2SR

C-MB3SL

C-MB3SR

C-MB4SL

C-MB4SR

C-MB6SL

C-MB6SR

C-MB8SL

C-MB8SR

C-MB9SL

C-MB9SR

C-MB10SL

C-MB10SR

C-MB1AMB

C-MB5BLB

C-MB7MBL

C-MB7MBR

C-MB1ASR

7

0

0

B

1

7

0

0

B

5

7

0

0

B

1

0

7

0

0

B

1

5

7

0

0

B

2

0

7

0

0

B

2

5

7

0

0

B

3

0

7

0

0

B

3

5

7

0

0

B

4

0

7

0

0

B

4

5

7

0

0

B

5

0

7

0

0

B

5

5

7

0

0

B

6

0

7

0

0

B

6

5

7

0

0

B

7

0

7

0

0

B

7

5

7

0

0

B

8

0

700B85

700B90

700B95

700B100

7

0

0

B

1

0

5

7

0

0

B

1

1

0

7

0

0

B

1

1

5

7

0

0

B

1

2

0

7

0

0

B

1

2

5

7

0

0

B

1

3

0

7

0

0

B

1

3

5

7

0

0

B

1

4

0

7

0

0

B

1

4

5

7

0

0

B

1

5

0

7

0

0

B

1

5

5

7

0

0

B

1

6

0

Y30

Y25

Y20

Y15

Y10

Y5

Y1

7

0

0

A

1

0

0

7

0

0

A

1

0

5

7

0

0

A

1

1

0

7

0

0

A

1

1

5

7

0

0

A

1

2

0

7

0

0

A

1

2

5

7

0

0

A

1

3

0

7

0

0

A

1

3

5

7

0

0

A

1

4

0

7

0

0

A

1

4

5

7

0

0

A

1

5

0

7

0

0

A

1

5

4

7

0

0

D

1

7

0

0

D

5

7

0

0

D

1

0

7

0

0

D

1

5

7

0

0

D

2

0

7

0

0

D

2

3

7

0

0

E

1

7

0

0

E

5

7

0

0

E

1

0

7

0

0

E

1

5

7

0

0

E

2

0

7

0

0

E

2

5

RM-3

PW-5A

RM-13

PW-5B

316A

316B

316C

7071

7075

70710

70715

70720

70725

70730

70735

70740

70745

70750

70755

70760

70765

70769

7

0

0

B

1

6

5

7

0

0

B

1

7

0

7

0

0

B

1

7

5

7

0

0

B

1

8

0

2

3

5

6

7

8

9

11

12

10

4

700F1

700F5

700F10

700F15

700F17

70770

70774

70778

9

0

0

A

1

9

0

0

A

5

9

0

0

A

1

0

9

0

0

A

1

5

9

0

0

A

2

0

9

0

0

A

2

5

9

0

0

A

3

0

8

0

0

A

1

8

0

0

A

1

0

8

0

0

A

2

0

8

0

0

A

3

0

8

0

0

A

4

0

8

0

0

A

5

0

8

0

0

A

6

0

8

0

0

B

1

5

8

0

0

B

1

0

8

0

0

B

4

8

0

0

B

3

8

0

0

B

1

PP134

PP135

PP136

PP137

8

0

0

C

1

8

0

0

C

1

0

8

0

0

C

2

0

8

0

0

C

2

8

9

0

3

_

1

9

0

3

_

1

0

9

0

3

_

2

0

9

0

3

_

3

0

9

0

3

_

3

9

8

0

0

D

1

8

0

0

D

1

0

8

0

0

D

2

0

8

0

0

D

2

3

E 2

49

0

00

E 2

50

0

00

E 2

41

0

00

N 6 303 000

N 6 304 000

N 6 293 000

N 6 292 000



800B LINElevels only

903POWER POLES

903 LINElevels only

800C LINElevels only

800D LINElevels only

1

5

8

1

5

1

9

5

1

0

5

1

0

1

5

2

0

1

5

2

0

2

5

2

5

1

5

1

0

1

5

3

5

4

0

1

5

1

5

1

0

1

5

1

0

1

2

5

2

0

3

0

1

5

3

5

4

0

1

5

5

1

0

1

5

2

0

2

5

2

5

2

0

1

5

1

0

5

1

3

0

5

1

0

1

5

0

4

5

4

0

3

5

1

5

1

0

5

9

5

1

5

5

6

0

1

0

1

5

2

0

2

5

5

1

0

2

0

2

5

3

0

3

5

4

0

4

5

1

5

0

5

1

0

1

3

5

5

6

0

1

5

1

0

1

5

5

1

0

1

5

2

0

25

2

0

1

P

A

N

E

L

6

1

2

P

A

N

E

L

6

1

1

P

A

N

E

L

6

0

9

2

5

5

No.1 D

RIF

T

No.2 D

RIF

T

1 in

4

G

RA

DE

1 in

4

G

RA

DE

U/C

D/C

15

20

25

35

5

140

1

4

5

1

5

0

1

5

5

1

3

5

1

3

0

1

2

5

1

2

0

1

1

5

1

1

0

1

0

5

1

3

5

1

3

5

1

3

0

1

3

0

1

2

5

1

2

5

1

4

0

1

4

5

1

5

0

1

6

0

1

6

0

1

2

0

1

2

0

1

1

5

1

1

5

1

1

0

1

1

0

1

0

5

1

0

5

100

95

90

85

80

75

70

65

60

95

90

85

1

5

1

5

70

75

80

85

90

95

5

1

1

10

5

10

15

20

1

5

10

15

15

20

20

25

25

30

30

35

1

6

5

1

6

5

1

7

0

1

7

0

1

7

5

1

8

0

1

8

5

174

178

7

0

6

5

6

0

5

5

5

0

4

5

4

0

3

5

3

0

2

5

2

0

1

5

1

0

5

1

3

0

3

5

4

5

3

0

5

0

5

1

0

1

5

5

1

0

1

5

2

0

2

5

3

0

3

4

1

6

5

3

0

1

5

1

10

15

20

25

30

35

40

45

50

55

60

182

10

5

1

15

1

1

1

1

1

10

15

20

25

30

1

5

4

3

1

0

1

0

5

1

5

1

1

5

2

0

1

5

6

0

5

5

5

0

4

5

4

0

3

5

3

0

2

5

2

0

1

5

1

0

5

1

1

5

1

0

1

5

2

0

5

1

0

1

5

1

5

1

0

5

1

45

40

35

30

25

20

15

10

5

1

10

5

1

2

5

2

0

1

5

1

0

5

1

1

0

1

5

5

1

25

20

15

10

5

1

20

15

5

1

6

4

1

1

1

1

5

1

5

1

5

P

A

N

E

L

6

1

0

P

A

N

E

L

6

0

8

P

A

N

E

L

6

0

8

P

A

N

E

L

6

0

6

E

A

S

T

P

A

N

E

L

6

0

8

P

A

N

E

L

6

0

6

P

A

N

E

L

6

0

6

PANE

L 307

P

A

N

E

L

3

3

1

P

A

N

E

L

6

0

8

P

A

N

E

L

6

0

5

P

A

N

E

L

6

0

7

P

A

N

E

L

6

0

9

A

P

A

N

E

L

6

0

9

B

P

A

N

E

L

6

0

9

C

P

A

N

E

L

6

0

9

D

L

O

N

G

W

A

L

L

7

L

O

N

G

W

A

L

L

4

L

O

N

G

W

A

L

L

5

L

O

N

G

W

A

L

L

6

L

O

N

G

W

A

L

L

1

L

O

N

G

W

A

L

L

2

L

O

N

G

W

A

L

L

3

L

O

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