Extraction Plan - Peabody Energy

Extraction Plan – North Wambo Underground Mine Longwalls 7 and 8The component management plans of this Extraction Plan reference components of a number ofexisting Environmental Management Plans to avoid duplication (Section 3). If these EnvironmentalManagement Plans are revised separately in accordance with the Development Consent(DA 305-7-2003) the management plans will be updated accordingly.Separately, WCPL is preparing an application to modify the Development Consent (DA 305-7-2003MOD 13) to allow for two additional longwalls at the North Wambo Underground Mine (Longwalls 9and 10) (Figure 3). Longwalls 9 and 10 would be the subject of a new Extraction Plan or a revision ofthis Extraction Plan.4.4 REVIEW OF OTHER MANAGEMENT PLANSAs part of the application under clause 88 of the Coal Mine Health and Safety Regulation, 2006 forlongwall mining of Longwalls 7 and 8, WCPL will revise the Inrush Management Plan and SlopeStability Management Plan to incorporate Longwalls 7 and 8.As part of the Subsidence Risk Assessment (Technical Report 4), WCPL identified an action torevise the Site Water Management Plan to incorporate the implications of:• dewatering of the overlying Whybrow Seam above Longwalls 7 and 8;• removal of water against the Homestead Mine portals to mitigate risk of inrush; and• any reduction in the storage capacity of South Wambo Dam to minimise potential subsidenceimpacts of Longwall 8.The Site Water Mangement Plan would be revised in accordance with the Development Consent(DA 305-7-2003) and submitted by the end of March 2013.4.5 KEY RESPONSIBILITIESKey responsibilities under this Extraction Plan are summarised in Table 25. The componentmanagement plans provide additional responsibilities under the plans. A summary WCPLorganisation structure is provided in Figure 14.EP/SMP LW7-8 Rev B December 2012 Page 64