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Ll <br />Battle Mountain Rwourcea, inc. <br />l12 Permit Modification <br />' temporarily stockpiled on Waste Rock Disposal Area B. Stockpiling will be <br />achieved within an additional lift on top of the existing Upper lift, and will <br />' conform to approved slope and setback guidelines. The additional waste rock <br />will be placed within the permitted bounds of Area B and will not increase the <br />disturbance area. This temporary lift will be removed and placed as backfill <br />in the Pink Gneiss area of the West Pit at the end of mine life. <br /> As part of the approved permit, a geotechnical fit;ld investigation of <br />this waste rock disposal area was completed. In general, Area B is underlain <br /> by relatively deep colluvial/alluvial deposits composed predominantly of <br /> poorly consolidated silty and gravelly sands. The I geotechnical field <br /> investigation is discussed in Section D.3.2.1 and Appendi~r C of the approved <br /> permit. <br />' <br /> D.3.2.3 West Pit Partial Backfill <br /> i <br />f <br />P <br />ill be <br /> a West <br />it, w <br />The West Pit, including the Fink Gne <br />ss area o <br />~ <br /> vill be backfilled to <br />partially backfilled with waste rock. The Deep West Pit <br /> a level that allows positive drainage at its southern limit. A total of <br /> 7,564,000 tons of waste rock will be placed as backfill iJM the West Pit area. <br /> Approximately 864,000 tons of this total will come f~om the temporary <br />t stockpile on Waste Rock Disposal Area B and be placedin the Pink Gneiss <br /> area of the West Pit. <br /> <br /> The backfilled area of the pit will be graded at a ominal 1,0 percent <br /> slope to drain to the south and southwest. Control ~of erosion will be <br />' accomplished in part by the existing series of benches n the pit wall and <br /> selectively placed rixkfill around the backfilUpit wall co~itact. '( <br />' <br /> Compaction of the backfill will be achieved ugh routing of the <br /> haulage equipment during placement so that minimals ttlement will occur <br />' after reclamation. Backfill placement will be conductejd in a manner that <br /> produces a final surface capable of free draining. <br /> <br />I' <br />I' <br /> ay D.5 Jxt o. _ <br />J <br />