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<br /> <br />1 <br /> <br /> <br />1 <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br /> <br />Waste Rock Disposal Areas <br />Waste rock disposal area reclamation costs are shown for each waste rock <br />disposal area. Waste rock disposal areas will cover a total of 252 acres. Dump <br />outslopes will be regraded to approximately 3H:1V prior to topsoil replacement. <br />A. Outslope Grading <br />Assume a 100 foot push. <br />Production of 500 yd s3/hour. <br />Adjusted for a job efficiency of 0.83 and a slope of 10'/0, production <br />is 456 yd s3/hour. <br />43,560 ftZ/acre x 15 feet x 1 yd3/27 ft3 = 24,200 yd3 <br />24,200 yds3 x 456 yd s3/hour x E90/hour = $4,776/acre <br />B. Topsoil Replacement <br />43,560 ftZ/acre x 1.5 ft topsail x 1 yd3/27 ft3 = 2,420 yd3 <br />Using a production of 153 yd3/hour: <br />2,420 yd3 x 1 hour/153 yd3 x E95/hour = $1,503 <br />C. Topsoil Grading <br />Using a production of 1,089 yd3/hour: <br />2,420 yd3 x 1 hour/1,089 yd3 x S90/hour = 5200 <br />TOTAL OUTSLOPE RECLAMATION COSTS/ACRE _ $4,776 <br />TOTAL WASTE ROCK DISPGSAL RECLAMATION COSTS/ACRE = 51,703 <br />(not including revegetation costs) <br />Phase 1 Waste Rock Disposal Area Reclamation Required <br />Waste rock disposal areas A, D, and the East Pit will tie completely <br />constructed by the end of year three. The south waste rock disposal area will <br />be partially constructed. <br />A. Waste Rock Disposal Area A <br />12 acres of outslopes, 48 acres total <br />(Revised 4/20/89) <br />' L-5 (Revised 3/14/89) <br />