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i. <br /> <br />•J <br />Whirlwind surface area. Additional details regazding ground water control aze presented in Exhibit <br />T. <br />A typical equipment list for the underground operation is presented in Section 4. Jacklegs operating <br />on compressed air will be utilized to drill the blast holes and rock-bolt holes in the drifts and <br />production azeas. A lazger jumbo drill may also be used in the development areas if conditions <br />warrant. The ore averages about three feet in thickness but the drifts aze approximately nine feet in <br />height while the stopes or rooms aze a minimum of six to seven feet in height. In order to avoid <br />excessive dilution of the ore, much of the waste will need to be drilled and shot sepazately from the <br />ore using what is referred to as "split shooting." <br />Blasting operations will be conducted in acwrdance with MSHA regulations (30 CFR Parts 56 and <br />57). Blast holes will be loaded with a blasting cap, chemical booster, and a mixture of ammonium <br />nitrate and fuel oil (ANFO) prills. The blasts will be initiated using anon-electric system (nonels) <br />with the hole pattern, firing sequence, and delays designed to allow for optimum breakage and <br />minimum ore dilution. Explosives and detonators will be initially stored in powder magazines <br />located on the surface neaz the portal. These magazines will be relocated underground once the <br />mine expands in size. Explosives will be transported from the magazines to the working face in <br />accordance with MSHA regulations (30 CFR Part 56 and 27 CFR Part 55). <br />The ore and waste rock will be mucked out using small diesel loaders. Ore will be hauled to the <br />surface using low-profile, diesel-powered haul trucks (commonly called buggies). Some of the <br />waste produced during later development and production maybe disposed of underground. <br />Back support will consist of installing five-foot to eight-foot-long mechanical split-set roof bolts. <br />Bolting will be performed as necessary with the spacing varying according to back conditions and <br />the size of the opening. Mine openings will be twelve feet wide in the drifts but may be wider in the <br />stopes. Metal mats and mine-grade wire will be installed in the back and diagonally on the ribs <br />when additional ground support is required. <br />Whirlwind Mine June 07 <br />D-5 <br />