Blakefield South Subsidence Monitoring Program

Blakefield South Mine
Sustainable Development
Plan
BSM SD PLN 0096
LONGWALL BSWL1 TO BSLW6 SUBSIDENCE
MONITORING PROGRAM
1.
INTRODUCTION
This Subsidence Monitoring Program outlines the proposed monitoring and reporting
program to be undertaken to measure subsidence movements and impacts as a result of
mining of Longwalls BSLW1-BSLW6 of the Blakefield seam in the Blakefield South Mining
Area. This monitoring program has been prepared in accordance with the NSW Department
of Primary Industries (Mineral Resources) Guideline for Subsidence Management Approvals
(2003) and meet the requirements Condition 12 of Subsidence Management Plan Approval
File No.04/1676 dated 30th April 2009.
2.
PURPOSE
This program has been developed to provide an overview of the monitoring program to be
implemented to assess the subsidence movements as a result of mining of Longwalls
BSLW1–BSLW6 of the Blakefield seam. Required actions and responsibilities are defined to
ensure monitoring is undertaken within required timeframes.
The results of monitoring will be compared with the predictions in the SMP Application to
assess whether the accuracy of predictions, the management strategies in place are
adequate and to provide feedback to stakeholders.
3.
SCOPE
This plan applies to Longwalls BSLW1-BSLW6 of the Blakefield seam in the Blakefield South
Mining Area at the Bulga Underground Operations (SMP area).
4.
MINE PLAN
The majority of the SMP area is located within land owned by the Bulga Joint Venture (BJV),
which is currently utilised for mining and agricultural purposes. The remainder of the SMP
area is located under privately owned land predominantly utilised for grazing and rural
activities. The surface of the land within the application area is generally flat to undulating
with vegetation dominated by pasture and woodland species.
The depth of cover to the seam above the proposed longwalls varies between approximately
130 metres at the eastern end of Longwall BSLW1 to approximately 335metres at the
maingate of Longwall BSLW6. The seam floor within the SMP area generally dips from the
north to the south. The seam thickness within the extents of the proposed longwalls varies
between a minimum of 2.2 metres near the western end of Longwall BSLW1 to a maximum
of 3.65 metres at the maingate of Longwall BSLW6.
The longwalls will be extracted below the previously extracted Longwalls 1 to 6 and E1 to E7
of the overlying Whybrow seam. The depth of cover to the previously extracted longwalls in
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence
Monitoring Program
Status: Approved
Version: 6.0
Effective:19/02/2014
Review: 20/02/2017
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Blakefield South Mine
Sustainable Development
Plan
the Whybrow seam varies between 40 metres at the northern end of Whybrow Longwall 1
and 350 metres at the southern end of Whybrow Longwall E7. The interburden thickness
between the Whybrow and Blakefield seams varies between 70 metres above the middle of
BSLW1 to BSLW3 and 100metres at the eastern end of BSLW1.Implementation.
5.
MONITORING PROGRAM
Beltana environmental monitoring includes a number of elements that are also necessary
for evaluating the potential impacts of subsidence specifically:
surface and groundwater; and
flora and fauna.
Additional elements specific to subsidence that require monitoring include:
surface safety;
public roads;
infrastructure;
private properties; and
mine owned properties.
The monitoring requirements of the various elements listed above are included in the
management plans listed in Table 5.1.
Table 5.1 - Existing Subsidence Management Plans at Beltana
Management Plan
Document ID
Beltana Highwall Mining Environmental Monitoring
Program.
BSM SD PLN 0042
Longwalls BSLW1 - BSLW6 Surface Safety Management
Plan.
BSM SD PLN 0112
Longwalls BSLW1 - BSLW6 Public Road Safety Subsidence
Management Plan.
BSM SD PLN 0092
Longwalls BSLW1 - BSLW6 Broke Private Irrigation District
(PID) and Broke Potable Water Supply (BPWS) Pipeline
Subsidence Management Plan.
Longwalls BSLW1 - BSLW6 Powerline Subsidence
Management Plan.
BSM SD PLN 0093
Longwalls BSLW1 - BSLW6 Telecommunications
Subsidence Management Plan.
BSM SD PLN 0094
Longwalls BSLW1 - BSLW6 Private Property Subsidence
Management Plans for Bird, McInerney, Lewis and Beltana
owned land.
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence
Monitoring Program
Status: Approved
Version: 6.0
BSM SD PLN 0100
various
Effective: 19/02/2014
Review: 20/02/2017
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Sustainable Development
Plan
5.1 SUBSIDENCE SURVEY MONITORING
Additional to the elements included in the management plans listed in Table 5.1 is the
requirement to monitor the ground subsidence to enable the comparison of actual
subsidence against predicted.
The objectives of the Blakefield South of this program are:
provide general information on the magnitude and extent of subsidence over the
proposed longwalls for multi-seam mining conditions;
compare the actual ground movements with predicted ground movements, so as
to improve the predictive methods and
guidelines for multi-seam mining conditions;
detect non-systematic movements such that any preventive measures, where
required, can be initiated;
5.2 Survey Methodology
A conventional traverse shall be run to establish control for the monitoring control
survey marks;
A total station shall be the primary source of all measurements;
A secondary source of measures will be GPS readings, these will be used when
climatic conditions are not favorable for the primary method to be used. If this
method is used GPS control shots of occupation of stations will be a minimum of 10
epochs will be undertaken;
All marks shall have a 3 dimensional component (x,y,z);
Individual point stations will be monitored with GPS readings;
Precision level run shall be undertaken to confirm trig levels of the traverse survey
control stations. These shall be used as a Secondary means to confirm status of
monitoring line control survey marks that are closer to subsidence impact zone if a
discrepancy begins to occur;
The total station used for the survey has an accuracy of 5mm +- 2ppm/klm for a
single prism;
Surveys will be taken pre, during and post longwall extraction. The frequency of
survey during longwall extraction will be dependent on the rate of retreat, however
surveys will not be taken at intervals greater than 1 month for all lines (or part
thereof) actively under the influence of subsidence. A post survey will be taken when
only minimal movement, between current preceded surveys has occurred; and
Data collected will be then presented in a spreadsheet format accompanied with a
plan showing the correlation of the survey and the retreating face.
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence
Monitoring Program
Status: Approved
Version: 6.0
Effective: 19/02/2014
Review: 20/02/2017
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Sustainable Development
Plan
5.3 Survey Monitoring Station
Generally the stations will be 2100mm long star pickets or to the point of refusal, driven
into the ground centre punched and spaced at intervals of 10m.
Other forms of subsidence monitoring that will be utilized include visual monitoring, aerial
elevation surveying (LIDAR), photographic monitoring or other systems which arise with
technology advancements. These other forms of monitoring compliment the traditional
ground monitoring.
The proposed plan for the remaining BSLW31 to BSLW5 is shown on Plan 2013134.
Following is a brief description of the various monitoring lines:
Broke Road (BSLW3 and BSLW4)
Ground monitoring line installed along the western side of Broke Road will provide
representative ground movements along the alignment of Broke Road, as well as
various services and infrastructure adjacent to Broke Rd. This line also references
the influence of the overlying Whybrow chain pillar.
Charlton Road (BSLW3)
Ground monitoring line installed along the eastern side of Eastern Road will
provide representative ground movements along the alignment of Charlton Road,
as well as various services and infrastructure adjacent to Charlton Rd.
X Line (BSLW3 and BSLW4)
Ground monitoring line installed as part of the extended X line will measure multi
seam subsidence towards the commencement end of BSLW3 and BSLW4.
LOM (BSLW3 to BSLW5)
Ground monitoring line installed as part of the extended LOM line will measure
multi seam subsidence towards the completion end of BSLW3, BSLW4 and BSLW5.
Measures ground strains in the wall of the Old Taillings Dam.
X-Line 2 (BSLW3 to BSLW5)
Ground monitoring line installed as part of the proposed new line will measure
multi seam subsidence in the middle of BSLW3, BSLW4 and BSLW5. Measures
ground strains in natural topography as opposed to fill (LOM).
BSLW4 Commencement (BSLW4)
Ground monitoring line installed will measure subsidence and angle of draw over
the commencement of BSLW4. Due to land ownership and topographical
constraints, BSLW4 is the only opportunity to measure the commencement end.
BSLW4 Centreline (BSLW4)
Ground monitoring line installed will measure ground movements in natural
topography as well as fill over the Main Gate of BSLW4 and Tail Gate of BSLW5.
The monitoring locations as shown in Plan 2013134-R4 have been designed taking into
account current surface constraints. These include topography, natural features, heritage
items, private landholders, infrastructure, public safety and visual amenity.
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence
Monitoring Program
Status: Approved
Version: 6.0
Effective: 19/02/2014
Review: 20/02/2017
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Sustainable Development
Plan
5.4 SUBSIDENCE INSPECTION MONITORING SUMMARY
Table 5.2 outlines the proposed subsidence inspection monitoring to be undertaken for
Longwalls BSLW1-BSLW6. The table describes the parameters, units, frequency and
responsibilities for carrying out the monitoring. Some actions are restricted to a single
longwall. Inspections will be carried out in stages as mining progresses.
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence
Monitoring Program
Status: Approved
Version: 6.0
Effective: 19/02/2014
Review: 20/02/2017
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Blakefield South Mine
Sustainable Development
Plan
BSM SD PLN 0096
Table 5.2 - Subsidence Inspection Monitoring
Public
Roads
Monitoring
Method
Sites
Parameters
Monitored
Units of
Measure
Monitoring
frequency
Responsibility
Visual inspection
Broke,
Charlton and
Fordwich
Roads, and
Butler’s Lane
Condition of
road and
associated
infrastructure
(including
culverts &
fences)
General
condition.
Prior to
undermining.
Evidence of
cracking or
humping
24/7 during
undermining of
Broke, Charlton
and Fordwich
Roads.
Beltana
Underground
Environment and
Community
Coordinator/ Mine
Subsidence Board
Weekly for
Butler’s Lane
during the
extraction of
Longwall
BSLW3 until
extraction face
is 200 metres
beyond
Charlton Road.
3 – 6 months
after mining
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence Monitoring Program
Status: Approved
Version: 6.0
Effective: 26/04/2012
Review: 26/04/2015
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Blakefield South Mine
Sustainable Development
Surface
Water
MonitoringDrainage
Lines
Monitoring
Method
Sites
Parameters
Monitored
Units of
Measure
Monitoring
frequency
Responsibility
Visual inspection
All drainage
lines within
the SMP
Application
area and the
wet soak
Condition
(including
existing erosion
and ponding),
water level and
any cracks
General
condition
One week prior
to commencing
Longwall
mining, and
post mining.
Beltana
Underground
Environment and
Community
Coordinator
Public Safety
Risks due to
cracking
Land
Visual inspection
Survey
Surface at and
behind the
active
longwall
extraction
face
Surface
Remediation
areas
Cracking,
stepping and
erosion
Areas of
significant
cracking
Mapping will be
carried out over
areas of
significant
cracking to
obtain baseline
data
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence Monitoring Program
m (water level)
mm (cracks)
Surveying of
drainage
channels may
be required to
confirm
drainage paths
Presence of
cracks/stepping/
erosion
mm (cracks/
stepping)
Status: Approved
Version: 6.0
Plan
Three-monthly
intervals during
the first six
months after
mining beneath
the area, and at
six-monthly
intervals for the
following year
One week prior
to commencing
Longwall
mining, during
and post mining
Beltana
Underground
Environment and
Community
Coordinator
After mining
Beltana
Underground
Environment and
Community
Coordinator
Effective: 26/04/2012
Review: 26/04/2015
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Sustainable Development
Fences and
access to
BJV Land
Dams
Monitoring
Method
Sites
Parameters
Monitored
Units of
Measure
Monitoring
frequency
Responsibility
Visual inspection
All fences
within SMP
Application
area, gates
and signage
preventing
access to BJV
land subject
to subsidence
Fence type and
condition
General
condition
Pre, during and
post mining
Beltana
Underground
Environment and
Community
Coordinator/Mine
Subsidence Board
Dams within
the SMP
Application
Nature and
condition of
drainage paths
and dam,
freeboard,
water level,
bank and bed
condition,
evidence of
cracking and
erosion
General
condition
One week prior
to commencing
Longwall
mining, during
mining, and
within one
month of
subsidence
occurring on
private land
Beltana
Underground
Environment and
Community
Coordinator
Sediment levels
behind fences
General
condition of
sediment
controls,
revegetation
areas and drains
At quarterly
intervals
Beltana
Underground
Environment and
Community
Coordinator
Visual inspection
area
Erosion and
Sediment
Control
Visual inspection
Disturbed
areas
BJV security
Revegetation
progress of
disturbed areas
Scour and
sedimentation
of drains
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence Monitoring Program
Status: Approved
Version: 6.0
mm (freeboard)
ML (water level)
mm (cracks)
Effective: 26/04/2012
Review: 26/04/2015
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Plan
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Blakefield South Mine
Sustainable Development
Monitoring
Method
Sites
Parameters
Monitored
Units of
Measure
Monitoring
frequency
Responsibility
Powerlines
Inspections
Energy
Australia
assets and
BJV assets the
SMP
Application
area
Safety and
serviceability of
the lines
including
ground
clearance
checks
General
Condition of
lines ( tension/
sag) and poles (
tilt)
Prior to, during
and after
mining.
Frequency will
be daily when
actively
subsiding poles.
Beltana
Underground
Environment and
Community
Coordinator
Private
Irrigation
District &
Broke
Potable
Water
Pipelines
and Tanks
Inspections
PID and BPWS
pipelines and
tanks within
SMP
Application
area
Establish
baseline
condition of
pipelines and
associated
infrastructure
Monitor the
pipeline, tanks
and associated
infrastructure
for leaks
General
condition
Prior to the
commencement
of each longwall
undermining
sections of the
pipelines/tanks.
Beltana
Underground
Environment and
Community
Coordinator
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence Monitoring Program
Status: Approved
Version: 6.0
Plan
Daily
monitoring
during the
undermining of
and 200m past
the pipelines,
tanks and
associated
infrastructure
Effective: 26/04/2012
Review: 26/04/2015
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Blakefield South Mine
Sustainable Development
Monitoring
Method
Sites
Parameters
Monitored
Units of
Measure
Monitoring
frequency
Responsibility
Aboriginal
Heritage
Inspections
All sites not
directly
affected by
mining (not
destroyed
under Section
90)
Site condition
(including
photographic
record)
General
condition
Annually.
Beltana
Underground
Environment and
Community
Coordinator
European
Heritage
Inspections
All heritage
sites within
SMP
Application
area
Overall
condition of site
General
condition
Prior to during
and after
mining
Beltana
Underground
Environment and
Community
Coordinator
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence Monitoring Program
Regular
inspections will
be carried out
during mining
Status: Approved
Version: 6.0
Effective: 26/04/2012
Review: 26/04/2015
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Plan
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Blakefield South Mine
Sustainable Development
Plan
BSM SD PLN 0096
6.
REPORTING
Reporting with regards to outcome on this plan are summarised in Table 6.1 below
Report Name
Frequency
Scope
Transmission
Distribution
Weekly Longwall
Update
Weekly
Structure
similar
to
Quarterly
Subsidence
Status Report.
Reporting
briefer
to
communicate
weekly
changes.
Email
Government
agencies
representatives,
CCC,
Private,
Landholders,
Infrastructure
owners
Quarterly
Subsidence
Status Report
Every 3rd month
of the calendar
year
Condition 17 of
Subsidence
Management
Plan Approval
File
No.04/1676
dated 30th April
2009
Hard Copy
Principle
Subsidence
EngineerDepartment
of
Industry
and
Investment,
Department
of
Water
and
Energy, Director
of
Environment
and
Sustainability,
CCC,
Infrastructure
Owners, Private
Landholders
AEMR
April each
following
previous
Schedule6
Condition 5 of
DA 376-8-2003
Hard Copy
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence
Monitoring Program
year
Status: Approved
Version: 6.0
Company
Website
Company
Website
Director General
Department
of
Planning,
Department
of
Industry
and
Investment,
Department
of
Water
and
Energy, Director
of
Environment
and
Sustainability,
CCC,
Infrastructure
Owners, Private
Effective: 26/04/2012
Review: 26/04/2015
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Blakefield South Mine
Sustainable Development
Plan
Landholders
Subsidence
Survey
Monitoring
Reports
Produced
Annually
AEMR
Subsidence
Survey
Monitoring
Results
Pre, During and
Post mining
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence
Monitoring Program
with
Condition 18 of
Subsidence
Management
Plan Approval
File
No.04/1676
dated 30th April
2009
Hard Copy
Condition 5 of
Subsidence
Monitoring
Strategy
Approval
File
No.04/1676
dated 16th June
2010. Results
provided
as
soon
as
practicable.
Digital
Status: Approved
Version: 6.0
Company
Website
Director General
Department
of
Planning,
Department
of
Industry
and
Investment,
Department
of
Water
and
Energy, Director
of
Environment
and
Sustainability,
CCC,
Infrastructure
Owners, Private
Landholders
Principle
Subsidence
EngineerDTIRIS
Effective: 26/04/2012
Review: 26/04/2015
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NSW
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Blakefield South Mine
Sustainable Development
7.
Plan
KET CONTACTS
Key contacts with regards to this plan are included in Table 7.1
Table 7.1: Key Contact Details
8.
Position
Name
Phone (W)
Phone (Mob)
Bulga Underground Operations
Manager
Mark Munro
6570 4300
0417 111 203
Bulga Complex Environment and
Community Manager
Ralph Northey
6570 2539
0418 439 874
Bulga Underground Environment
and Community Manager
Ned Stephenson
6570 4366
0400 266 877
Environment and Community
Officer
Martin Salm
6570 4281
0418 737 760
Bulga Underground Mine
Surveyor
Steve Allen
6570 4209
Mine Subsidence Board
Richard Pickles
6572 4344
0425 275 564
Telecommunications Consultant
Colin Dove
9546 4771
0428 970 826
Telstra
Mark Schneider
0419 242 044
Energy Australia Contact
Ian Hall
0417 472 670
Broke Potable Water Supply
Contact
Ian Vickers
6578 7283
0411 559 316
Private Irrigation District
Emergency Number
John Lamb
6574 5205
0427 695 468
REFERENCES
Umwelt 2003. Bulga Coal Continued Underground Operations EIS July 2003.
SEE for the Bulga Underground - Southern Mining Area Modification - Section
96(2) Application to Modify Consent DA 376-8-2003.
MSEC 2008. Mine Subsidence Engineering Consultants Report Number MSEC334,
Revision C.
MSEC 2010a – Mine Subsidence Engineering Consultants Report Number
MSEC393, Revision B.
MSEC 2010b – Mine
MSEC452, Revision A.
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence
Monitoring Program
Subsidence
Engineering
Status: Approved
Version: 6.0
Consultants
Report
Effective: 26/04/2012
Review: 26/04/2015
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Number
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Sustainable Development
MSEC 2011- – Mine Subsidence Engineering Consultants
MSEC464, Revision A.
Report
Plan
Number
Galvin 2008 – Galvin and Associates Report Number 0908/6-1b, November
2008.Subsidence Risk Assessment Associated with Mining Longwalls SB1- SB6 of
the Blakefield Seam November 2007
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence
Monitoring Program
Status: Approved
Version: 6.0
Effective: 26/04/2012
Review: 26/04/2015
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Sustainable Development
Plan
BSM SD PLN 0096
BSM SD PLN 0096
Longwall BSWL1 to BSLW6 Subsidence Monitoring Program
Status: Approved
Version: 6.0
Effective: 26/04/2012
Review: 26/04/2015
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