Extraction Plan - Peabody Energy

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Extraction Plan – North Wambo Underground Mine Longwalls 7 and 8SGWRPSMPthe SMPGuidelineSWMPTARPTGTSMPS&MPSurface and GroundwaterResponse PlanSubsidence Management PlanGuideline for Applications forSubsidence Management PlanApprovals (Department ofMineral Resources, 2003).Surface Water MonitoringProgramTrigger Action Response PlantailgateThreatened SpeciesManagement PlanSalvage and ManagementProgrammeVCPWAMPWCPLWHCWHCMMPWHEZWMP° degree% percentVegetation Clearance ProtocolWCPL Asset ManagementPlanWambo Coal Pty LimitedWambo Homestead ComplexWambo Homestead ComplexMine Management PlanWambo Homestead ExclusionZoneWater Management Plan6.2 GLOSSARYNote: Terms in bold are defined in the Development Consent (DA 305-7-2003), the majority of theremaining definitions are adopted from the SMP Guideline.AlluvialAngle of DrawAquiferBaseflowCumulativeSubsidenceDevelopmentConsentEnvironmentalConsequenceFaultFirst WorkingsGeologicalStructuresGoafA general term for clay, silt, sand and gravel transported by water and deposited,on the bed of a floodplain, river or stream.The angle between the vertical and the line joining the edge of the mining void withthe limit of vertical subsidence, usually taken as 20 mm.A sub-surface rock formation containing water in recoverable quantities.The discharge of sub-surface water into a stream (i.e. groundwater seepages).The total subsidence effects resulting from all seams mined up to and including theWambo Seam (i.e. future workings not included in this Extraction Plan are notincluded in the cumulative subsidence prediction).Development Consent DA 305-7-2003 for the Wambo Coal Mine was granted on 4February 2004 by the then NSW Minister for Urban Affairs and Planning underPart 4 of the NSW Environmental Planning and Assessment Act, 1974.The environmental consequences of subsidence impacts, including: damage toinfrastructure, buildings and residential dwellings; loss of surface flows to thesubsurface; loss of standing pools; adverse water quality impacts; development ofiron bacterial mats; cliff falls; rock falls; damage to Aboriginal heritage sites;impacts on aquatic ecology; ponding.Major fracture of the earth’s crust caused by the relative movement of the rockmasses on either side.Underground workings which establish access to the coal resource area.Geological structures are faults, igneous intrusions, joints or any other significanttype of discontinuity or disturbances within the rock strata.The mined-out area into which the immediate roof strata break.EP/SMP LW7-8 Rev B December 2012 Page 69
Extraction Plan – North Wambo Underground Mine Longwalls 7 and 8IncrementalSubsidenceMitigationMeasuresRemediationMeasuresRiskSafe,Serviceableand RepairableSecondWorkingsStrainSubsidenceEffect (orSubsidence)SubsidenceImpactTiltUpsidenceVerticalsubsidenceWHC CurtilageThe subsidence effects resulting from mining in the Wambo Seam only, includinggoaf re-activation of the previous workings in the Whybrow Seam (i.e. not includingany subsidence already completed as a result of mining in the Whybrow Seamand/or Woodlands Hill/Arrowfield Seam).Subsidence management measures which aim to reduce subsidence impacts,usually implemented prior to or during mining.Subsidence management measures which aim to repair any adverse effects ofsubsidence, usually implemented after mining.The chance of something happening that will have an impact upon objectives. It ismeasured in terms of consequence and likelihood.Safe means no danger to users who are present, serviceable means available forits intended use, and repairable means damaged components can be repairedeconomically.Extraction of coal by longwall mining or pillar extraction that may result in surfacesubsidence.The change in the horizontal distance between two points at the surface and istypically expressed in units of mm/m. Tensile strain is an increase in the distancebetween two points (i.e. stretching) and compressive strain is a decrease indistance (i.e. squeezing).Deformation of the ground mass due to mining, including all mining-induced groundmovements, such as vertical and horizontal displacement, tilt, strain and curvature.Physical changes to the ground and its surface caused by subsidence effects,including tensile and shear cracking of the rock mass, localised buckling of stratacaused by valley closure and upsidence and surface depressions or troughs.The change in the slope of a land surface as a result of differential subsidence andis expressed in units of millimetres per metre (mm/m) or a change in grade where1 mm/m = 0.1%.Relative vertical upward movements of the ground surface associated withsubsidence.Vertical downward movements of the ground surface caused by underground coalmining.The boundary of the listing of the Wambo Homestead Complex under the StateHeritage Register of NSW.EP/SMP LW7-8 Rev B December 2012 Page 70
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