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Amendment of M-84-041 Exhibit D page 3 <br />IV MINING PROCEDURE <br />The mining will be accomplished using a Caterpillar PR-750 or <br />PR-1000 ROTO-MILL. The use of this equipment will replace the <br />standard functions of drilling, blasting and crushing. Optimum <br />operating conditions for this equipment consist of a large flat <br />area, across which the machine. can make long, parallel passes, <br />making a cut into the rock up to ten inches deep, for each pass. <br />Mining will be started at the highest point on the ore body, on a <br />surface that has been prepared by removal of overburden-topsoil. <br />The active mining area will be a large flat surface, tilted <br />slightly to accommodate drainage, which becomes progressively <br />larger and lower as each "slice" of ore is is removed. <br />Each Gass of the machine will cut the rock for a width of 10 or 12 <br />feet. The mined rock will be either deposited in a windrow in the <br />center of the cut or be loaded directly onto a truck. If <br />deposited in a windrow, the mined ore will be loaded onto trucks <br />for direct transport to the plant or to the stockpile area, or <br />picked up by wheel-tractor-scrapers and transported to the <br />stockpile area. Some of the raw rock at the stockpile will be <br />screened to produce the 3-inch by 3/8-inch material required by <br />Ideal Cement, and/or to remove fines known to contain materials <br />deleterious to wallboard manufacture. Material will be <br />transported from the mine and/or stockpile area to the plant or <br />rail loadout in belly-dump, tractor-trailer, 25 ton highway Iegal <br />trucks. <br />Mining will begin on the northeast side of the north mining area <br />in area (C) at the top of the hill and expand southwesterly as the <br />mining surface lowers. Clearing and stripping must be maintained <br />for considerable distance (100 to 150 feet) beyond the perimeter <br />of the active mining area to prevent intermixing of ore and <br />overburden-topsoil in the areas where the roto-mill turns to <br />begin its next pass. The approximate rate of advance of the <br />mining operation is illustrated on the reclamation plan maps. As <br />illustrated, the mine floor will be at approximate elevation 6900 <br />in 3 years and at approximate elevation 6825 in 12 years. <br />As the surface of the ore is lowered, excavation adjacent to the <br />ore in area (D) will be accomplished with the Roto-mill to prepare <br />turning space for the mill on the end of each ore cut pass and to <br />adjust the location and elevation of the mine haul road. The <br />excavated material will be waste rock and will be stockpiled in <br />area (E). <br />JEROME F. GAMBA 8 ASSOC. <br />CONSULTING ENGINEERS <br />