2014-12-15_PERMIT FILE - M2014043

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MINING PLAN EXHIBIT D(CONT) IN STAGE 1 THE MINING WILL BE 10 FEET INSIDE THE SLURRY WALL ON EAST AND NORTH SIDES. ALONG THE WEST SIDE IT WILL BE A MINIMUM OF 200 FEET FROM THE THORNTON SLURRY WALL/DAM STRUCTURE AND ON THE SOUTH SIDE IT WILL BE 42 FROM THE PERMIT LINE OR 10 FEET INSIDE THE SLURRY WALL . IN STAGE 2 ALONG THE NORTH AND SOUTH THE SETBACK WILL BE A MINIMUM OF 25 FEET AND ON THE EAST SIDE IT WILL BE 50 FEET FROM THE PERMIT LINES . ON THE WEST SIDE IT WILL BE 10 FEET INSIDE THE SLURRY WALL . The plan �T'MIT= FOR MINING ALONG the perimeter by leaving AN ADEQUATE SETBACK stnpnn, adjacent to any structures = - NEEDED A graded 3h to lv SLOPE COULD BE BUILT IF NEEDED THAT t*T}' eliminates any chance that these structures will be affected by mining. This means leaving some gravel but will insure the integrity of the banks until filling is complete. MAP EXHIBIT CAND EXHIBITS contain information on all structures within 200 feet of the mined area. Site preparation will begin in Stage 1 on the southwestern part of the permit area. Once the area has been cleaned of trees, buildings and other rubbish, a slurry wall will be constructed around the area to be mined. This will serve to block ground water from entering the mining area to reduce the exposure of ground water and allow the area to be mined and backfilled as a dry site. The estimated length of the Stage 1 slurry wall will be 2270 feet and when keyed into bedrock will average 28 feet deep. THE MINING FACE WILL BE WORKED AT A NEAR VERTICAL SLOPE (%: 1) AS MINING PROGRESSES THRU THE AREA . NO MINING WILL TAKE PLACE WITHIN 200 FEET OF THE THORNTON RESERVOIR COMPLEX SLURRY WALL/DAM. THIS S SHOWN ON MAP EXHIBITS; C-1, F, AND FIGURES E-1, E-2 AND E-3 . PLEASE SEE THE ATTACHED GEOTECHNICAL EXHIBITS PREPARED BY DEERE AND AULT CONSULTANTS FOR THE MINING SETBACKS AROUND THE MINE . ALONG THE SOUTH SIDE OF STAGE 1 THE MINING SETBACK WILL BE 42 FEET. THIS ALLOWS FOR A SAFETY FACTOR OF 1 . 3 TO PROTECT STRUCTURE ALONG THE MINE PERIMETER. A Plant Site/Stockpile area will be graded on the east side of the existing lake and the access roads will be improved to facilitate hauling from the site . Once these areas are completed mining will begin on the west side of Stage 1 and all material will be hauled to the Plant Site or stockpiled on the west end of Stage 2 above the Plant Site until it can be processed. This will create a hole that will be used as a siltation pond for wash water recycling, that will last for the life of the mine .