Subsidence Management Plan - Quetools
Subsidence Management Plan - Quetools Subsidence Management Plan - Quetools
establish that no further subsidence impacts are likely. The Farm FencesSubsidence Management Plan was developed based on previous experienceundermining fences and in consultation with the landowners.Farm DamsA specific management plan has been developed for farm dams within theApplication Area (Annex I) which identifies the specific monitoring programfor subsidence impacts. Pre-mining surveys of each accessible dam willestablish the shape, wall height, level of the spillway (if present), depth,storage capacity, pH and EC. Weekly inspections of the potentially affecteddams will be undertaken during mining to allow the implementation ofsubsidence impact management processes as required. The Farm DamsSubsidence Management Plan was developed based on previous experienceundermining dams and in consultation with landowners.6.6 INDUSTRIAL, COMMERCIAL AND BUSINESS ESTABLISHMENTSRavensworth East PitThe subsidence impacts on the Ravensworth East Open Cut are likely to beinsignificant and imperceptible for all practical purposes because it is locatedlargely outside the Application Area.Ravensworth East has mined two shallow box cuts (tailings pits) up to 35mbelow the surface. As indicated within the Mt Owen EIS (Umwelt, 2003) andthe Mt Owen Complex MOP (2006), the southern tailings pit (TP2) is locatedwithin the north western portion of the Application Area, over Longwalls 15to 17. The northern portion (outside of the Application Area) has beenpartially backfilled.The Mt Owen Complex MOP (2006) has identified the southern tailings pit asan emplacement area until 2010. The ‘Staged Mining and Rehabilitation Planas at Year 2010’ identifies the southern portion of the TP2, above Longwalls 15to 17, as ‘proposed future tailings emplacement area – subject to Section 126Application’ (Mt Owen MOP, 2006). The proposed GCCM operations will notundermine the southern tailings pit until late 2011, but the final use of thesouthern tailings pit at that date cannot be confirmed.In the event that the pit is proposed to be used for a tailings dam, theproposed changes will need to be the subject of further development approval(Mt Owen MOP, 2006). These changes would need to be assessed by XMO/Xstrata and considered by the approval body having regard to all informationavailable at that time, including this SMP if approved.ENVIRONMENTAL RESOURCES MANAGEMENT AUSTRALIA 0038321/FINAL/3 JANUARY 200712
In this instance, the principal impacts of subsidence on the Ravensworth EastTailings Pit (TP2) are likely to be differential vertical subsidence with potentialfor the tailings to overtop the perimeter embankments. Without specific detailof the pit geometries, it is difficult to be precise about the likely subsidenceimpacts. However, there would not appear to be any impediment tomanaging these impacts through control of the tailings level and building upof the perimeter bunds potentially subject to vertical subsidence.GCCM has prepared a specific management plan for the Ravensworth EastTailings Pit (Annex J). Under the terms of the Deed, XMO is not permitted toobject to DPI or any other person about this SMP which will include themanagement plan for the Ravensworth East Tailings Pit. GCCM willcooperate with XMO to accommodate any reasonable changes arising fromtheir operational requirements up to the point that such changes do notimpede GCCM's ability to extract the coal and maximise the reserves in themanner that its mining lease requires.Glendell Open Cut and Haul RoadSubsidence impacts on the Glendell Open Cut are likely to be insignificant andimperceptible for all practical purposes because it is located outside theApplication Area. Consequently, no specific monitoring has beenrecommended.Similarly, the Glendell haul road is not expected to be perceptibly affected bymining subsidence and no specific monitoring has been recommended.The edges of the proposed Glendell overburden dump would be expected toexperience vertical subsidence up to about 1.5m. Some lateral dilation of thedump slopes would be expected and surface cracking may be evident near thetop of the slope. If there is considered to be potential for slope instability inthis area, impacts can be managed by inspection and filling of any open cracksat the completion of each of Longwalls 14 to 16 (SCT, 2006).Glendell has accepted liability for subsidence damage which might be causedto its overburden dump by reason of GCCM's undermining. Specifically, inthe MPLA Agreement (dated 1996), Glendell agreed to:indemnify MMC against all claims costs demands losses or expenses suffered byGlendell for which MMC would otherwise be liable in connection with damage tothe emplacement due to subsidence arising out of or in connection with MMC'sunderground mining activities carried out under CL 382 on the Land providedthat the mining is carried out my MMC in accordance with approvals from theDepartment of Mineral Resources.Managing and repairing any subsidence damage to the overburden dump istherefore the responsibility of Glendell and no specific monitoring has beenrecommended.ENVIRONMENTAL RESOURCES MANAGEMENT AUSTRALIA 0038321/FINAL/3 JANUARY 200713
- Page 3 and 4: CONTENTS1 INTRODUCTION1.1 SCOPE 11.
- Page 5 and 6: 1 INTRODUCTIONThis Application for
- Page 7 and 8: 2 MINE PLANNING2.1 MINING METHODSTh
- Page 9 and 10: 5 COMMUNITY CONSULTATIONGCCM consid
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- Page 15 and 16: changes to drainage paths and chann
- Page 17: Subsidence Management Plan was deve
- Page 21 and 22: Mt Owen Rail Spur Line and Associat
- Page 23 and 24: The monitoring processes described
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- Page 27 and 28: and gates and farm dams. These mana
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- Page 31 and 32: allow more detailed and appropriate
- Page 33 and 34: 9 PUBLIC SAFETY MANAGEMENT PLANA Pu
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In this instance, the principal impacts of subsidence on the Ravensworth EastTailings Pit (TP2) are likely to be differential vertical subsidence with potentialfor the tailings to overtop the perimeter embankments. Without specific detailof the pit geometries, it is difficult to be precise about the likely subsidenceimpacts. However, there would not appear to be any impediment tomanaging these impacts through control of the tailings level and building upof the perimeter bunds potentially subject to vertical subsidence.GCCM has prepared a specific management plan for the Ravensworth EastTailings Pit (Annex J). Under the terms of the Deed, XMO is not permitted toobject to DPI or any other person about this SMP which will include themanagement plan for the Ravensworth East Tailings Pit. GCCM willcooperate with XMO to accommodate any reasonable changes arising fromtheir operational requirements up to the point that such changes do notimpede GCCM's ability to extract the coal and maximise the reserves in themanner that its mining lease requires.Glendell Open Cut and Haul Road<strong>Subsidence</strong> impacts on the Glendell Open Cut are likely to be insignificant andimperceptible for all practical purposes because it is located outside theApplication Area. Consequently, no specific monitoring has beenrecommended.Similarly, the Glendell haul road is not expected to be perceptibly affected bymining subsidence and no specific monitoring has been recommended.The edges of the proposed Glendell overburden dump would be expected toexperience vertical subsidence up to about 1.5m. Some lateral dilation of thedump slopes would be expected and surface cracking may be evident near thetop of the slope. If there is considered to be potential for slope instability inthis area, impacts can be managed by inspection and filling of any open cracksat the completion of each of Longwalls 14 to 16 (SCT, 2006).Glendell has accepted liability for subsidence damage which might be causedto its overburden dump by reason of GCCM's undermining. Specifically, inthe MPLA Agreement (dated 1996), Glendell agreed to:indemnify MMC against all claims costs demands losses or expenses suffered byGlendell for which MMC would otherwise be liable in connection with damage tothe emplacement due to subsidence arising out of or in connection with MMC'sunderground mining activities carried out under CL 382 on the Land providedthat the mining is carried out my MMC in accordance with approvals from theDepartment of Mineral Resources.Managing and repairing any subsidence damage to the overburden dump istherefore the responsibility of Glendell and no specific monitoring has beenrecommended.ENVIRONMENTAL RESOURCES MANAGEMENT AUSTRALIA 0038321/FINAL/3 JANUARY 200713
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