Extraction Plan - Peabody Energy

Extraction Plan – North Wambo Underground Mine Longwalls 7 and 84 IMPLEMENTATION4.1 ADAPTIVE MANAGEMENT AND CONTINGENCY RESPONSE4.1.1 Adaptive ManagementWCPL will implement an adaptive management approach to ensure subsidence impact performancemeasures (Table 5) are achieved at the North Wambo Underground Mine. Adaptive management willinvolve:• Planning – developing management strategies to meet performance measures; identifyingperformance indicators to assess performance; and establishing monitoring programs to monitoragainst the performance measures.• Implementation – implementing management strategies and monitoring impacts againstperformance indicators.• Review – reviewing and evaluating the effectiveness of management strategies by analysis ofmonitoring data against predicted impacts, performance indicators and performance measures inaccordance with the schematic presented in Figure 10.• Contingency Response – implementing contingency plans where a potential exceedance of asubsidence impact performance measures or an unexpected impact is detected (Section 4.1.2).• Adjustment – adjusting management strategies to improve performance, particularly following anexceedance of a subsidence impact performance measure or detection of an unexpected impact.4.1.2 Contingency ResponseIn the event the performance measures in Table 5 are considered to have been exceeded or are likelyto be exceeded, WCPL will implement the Contingency Plan outlined further below.Responsibilities during contingency response are outlined in Table 22, which is designed to clearlyoutline actions, levels of responsibility within WCPL and reporting requirements where monitoringresults indicate that impacts are exceeding (or likely to exceed) predicted or approved limits. Thistable is designed to support the Trigger Action Response Plans (TARPs) provided in the componentmanagement plans (Appendices A to F). These TARPs will be developed further as this ExtractionPlan is reviewed and revised.Relevant management and contingency measures are summarised in Section 3 and outlined in thecomponent management plans (Appendices A to F). WCPL will consider changes to longwallextraction geometry (in consultation with relevant regulatory authorities) if the following is confirmed tohave occurred:• Greater than negligible impact on the heritage values of the WHC (in addition to those impactsidentified in the WHCMMP).• Greater than negligible impact to Wollombi Brook (other than the controlled release of excess sitewater in accordance with EPL requirements).• Greater than nil impact to Wollemi National Park.Changes to longwall geometry would be implemented through WCPL’s internal Mine Plan DesignAlteration procedure (SWP 9004) administered by the Mine Surveyor.EP/SMP LW7-8 Rev B December 2012 Page 57