Extraction Plan - Peabody Energy

More documents

Recommendations

Info

Extraction Plan – North Wambo Underground Mine Longwalls 7 and 83.4.2 Key Built Features Issues, Monitoring and Management MeasuresBuilt features within the Longwalls 7 and 8 Application Area consist of (Figure 9):• a number of WCPL-owned assets (as described in Table 10 and the WAMP);• South Wambo Dam (constructed 2010) (a Prescribed Dam) owned by WCPL (as described in thePDMP); and• a 2 km section of 11 kV powerline to the South Wambo Dam (Ausgrid’s 11 kV powerline).The key issues relating to management of these built features in regard to subsidence impacts aredescribed in the relevant component plans of the BFMP. The relevant monitoring and managementmeasures for these built features are summarised in Table 16.The Longwalls 7 and 8 Application Area is located within the Notification Area of the followingPrescribed Dams (Figure 9):• South Wambo Dam Notification Area (Plan Number NA-231).• North East Tailings Dam Notification Area (Plan Number NA-56).The Draft South Wambo Dam Notification Area that is currently under consultation between WCPLand the DSC, with a revised Notification Area expected in December 2012, is also shown in Figure 9.The Draft South Wambo Dam Notification Area overlies Longwall 8 only, while the current SouthWambo Dam Notification Area overlies both Longwalls 7 and 8.Detailed monitoring and management measures for Prescribed Dams would be developed by WCPLas part of applications for mining within the South Wambo Dam Notification Area and the North EastTailings Dam Notification Area which would be submitted to the DSC prior to mining within theseareas. The various components that would be included in the application are summarised in thePDMP.The section of Ausgrid’s 11 kV powerline with the Longwalls 7 and 8 Application Area has beenidentified by Ausgrid as "not in use" and is proposed to be decommissioned. If the section of Ausgrid’s11 kV powerline with the Longwalls 7 and 8 Application Area is not decommissioned, WCPL wouldprepare an AAMP (Ausgrid Asset Management Plan) in consultation with Ausgrid for the managementof this powerline.3.4.3 Assessment of Performance Indicators and MeasuresPerformance indicators developed for the subsidence impact performance measures relating to builtfeatures relevant to the extraction of Longwalls 7 and 8 are presented in the component plans of theBFMP and are summarised in Table 17. Monitoring conducted to inform the assessment of theextraction of Longwalls 7 and 8 against these performance indicators is summarised in Section 3.8and Appendix H.The procedure followed to assess the extraction of Longwalls 7 and 8 against the performanceindicators and performance measures is outlined in Figure 10 and described in detail in Appendix D.3.4.4 Contingency PlanIn the event that the subsidence impact performance measures relating to built features summarisedin Table 17 are considered to have been exceeded or are likely to be exceeded, WCPL will implementa Contingency Plan as described in Section 4.1.EP/SMP LW7-8 Rev B December 2012 Page 41
Extraction Plan – North Wambo Underground Mine Longwalls 7 and 8Table 16Built Feature Management Associated with the Extraction of Longwalls 7 and 8Issue Monitoring ManagementWCPLAssetsPrescribedDamsAusgridAssets• Monitoring ofsubsidence inaccordance with theSubsidence MonitoringProgram (Appendix H).• Visual inspections asdescribed in Section 3.8and the SubsidenceMonitoring Program(Appendix H).• Assessment of WCPL assets to identify modifications potentially required prior to subsidence.• Maintenance of safe access to WCPL assets such that WCPL personnel are able to undertake routinemaintenance and remediation works as required.• Implementation of communication protocols to ensure internal WCPL stakeholders are aware of the longwallprogression and are able to provide sufficient notification to relevant WCPL personnel regarding potentialsubsidence to WCPL assets.• Posting of warning signs at suitable locations on old haul roads and site access tracks and updating warningsigns if a change to the WCPL asset is identified during monitoring.• Provision of 15 m separation barrier around the Homestead pit highwall.• Following subsidence, fitting of WCPL powerlines with stays where affected by subsidence.• Structural assessment of WCPL assets and subsidence assessment post-Longwalls 7 and 8 extraction.• Repair of WCPL assets in accordance with associated standards and procedures.• Lowering the inundation level to an extent outside of the angle of draw prior to extraction of Longwall 8 withina 26.5° angle of draw to the South Wambo Dam inundation area. 1• Structural assessment of South Wambo Dam following completion of active mining. 1• Repair of any damage to the Prescribed Dam resulting from the extraction of Longwalls 7 and 8 (i.e. WCPLwill restore the safety of any Prescribed Dam if compromised by mining). 1• Decommissioning of powerline prior to subsidence.• If not decommissioned, preparation of an AAMP in consultation with Ausgrid for the management of thispowerline.1 Potential management measure only, actual management measures would be developed as part the application to the DSC.EP/SMP LW7-8 Rev B December 2012 Page 42
Page 1 and 2: WAMBO COAL PTY LTDNORTH WAMBO UNDER
Page 3 and 4: Extraction Plan - North Wambo Under
Page 15: Extraction Plan - North Wambo Under
Page 82 and 83: WAMBO COAL PTY LTDNORTH WAMBO UNDER
Page 102 and 103:
Extraction Plan - North Wambo Under
Page 104 and 105:
Page 106 and 107:
Page 108 and 109:
WAMBO COAL PTY LTDNORTH WAMBO UNDER
Page 110 and 111:
ClassifiedsEmail: sales.singletonar
Page 134 and 135:
Page 136 and 137:
Page 138:
Page 141 and 142:
Extraction Plan/Subsidence Manageme
Page 143 and 144:
Page 145:
show all

Extraction Plan - Peabody Energy

Create successful ePaper yourself

Delete template?

Save as template?