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• <br />• <br />(2) When backfilling is a part of the plan, the Operator shall replace overburden <br />and waste materials in the mined area and shall ensure adequate compaction for <br />stability and to prevent leaching of toxic or acid forming materials: <br />The operation will not conduct backfill operations as one would expect for open pit or strip mine <br />There is always the possibility some minor backfilling may occur. Where backfilling should <br />occur, it will be done in such a manner that the backfilled material will be appropriately <br />compacted to prevent slippage or settling, provided it can be done in a manner not endangering <br />operators and equipment. No toxic or acid forming material will be backfilled on site. <br />Therefore, leaching of toxic or acid forming materials shall not occur. <br />(3) All grading shall be done in a manner to control erosion and siltation of the <br />affected land, to protect areas outside the affected land from slides and other <br />damage. All highwalls shall be eliminated: <br />Since this is an underground mining operation, there will be no highwalls. There will be some <br />rock faces where adits occur. At least two adits are anticipated (an existing adit and the proposed <br />Cross Mine Decline portal). Grading will be done on the contour where it does not pose a safety <br />hazard to operators and equipment. During site reclamation, BMP storm water control practices <br />will be in place to control erosion and siltation. Slides and other damage should not be a factor <br />since only small areas will likely need to be graded. <br />(4) All backfilling and grading shall be completed as soon as feasible after the <br />mining process. The Operator shall establish reasonable timetables consistent with <br />good mining and reclamation practices: <br />Once mining operations are completed, buildings and other structures will be demolished, <br />foundations broken up and buried. (Calais reserves the right to retain buildings and other <br />structures on -site at the request of the land owner. If retained on -site, building and structures <br />will meet applicable Boulder County building and zoning code.) Any necessary backfilling and <br />grading will follow. <br />(5) All refuse and acid forming or toxic producing materials that have been <br />mined shall be handled and disposed of in a manner that will control unsightliness <br />and protect the drainage system from pollution: <br />Please see Section 6.3.3(1)(k), above. In addition, any refuse will be disposed off site at an <br />approved facility. <br />Page 41 <br />