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<br />EXHIBIT D --MINING PLAN <br />(a) Description of methods of mining. <br />Mining will progress as it has on the site for over twenty years, a typical surface mine <br />highwall technique of drilling, blasting, and front-end loaders that muck and carry <br />material to on site mobile crushing units. Drilling benches range from 30-40 feet in <br />height and blasthole configurations are 14'x 14' burden and spacing, 4" holes for powder <br />factors between .25 and .35 pounds per ton of rock shot. All blasting operations are <br />performed within the guidelines of the Technical Revision #3, Blasting Monitor ng <br />Program that was approved by DMG in 1996. Please refer to the mine file for ttie details <br />of this blasting control program. Shot rock is bulldozed off the highwall contact to a <br />muckpile directly below the working face, then picked up with a front end loader and <br />carried to the nearby crushing and screening systems. The crushing and screening <br />systems includes arip-rap separation grizzly, primary jaw crusher, triple deck screen, and <br />secondary cone with supporting conveyors for material stockpiles. All mining and <br />process operations are performed in accordance with a site fugitive dust prograrri <br />approved by the Colorado Department of Health Air Quality Control Division for site and <br />process equipment dust control. Stockpiles of crushed aggregate are kept wet to <br />minimize fugitive dust during loading and haulage operations. Highway trucks will be <br />used to transport product from the site. <br />Mining will continue north, into the proposed permitted area, away from existing; <br />residential areas. The granite gneiss foliage lies in a plane much more stable in the north, <br />south direction. This amendment will allow the highwall to stay in this north, south <br />direction, which has proven to be much more stable in recent mining. <br />(b) earthmoving--No soils exist on the surface for removal prior to mining, and no waste <br />is encountered during mining operations. <br />(c) water diversions and impoundments--Stormwater Management Plan--please refer to <br />the Stormwater Management Plan Map and the attached narrative describing the <br />construction of settling ponds. <br />(d) size of the mining area--the highwall mining operation keeps the total acreage <br />exposed to a minimum. <br />