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