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<br /> <br />• Weight correction factor 0.79 (waste rock weight estimated to be 2,900 <br />Ibs/yd~ the D-8N has a rated capacity of 2,30016s/yd3l <br />Weight correction factor = 2,300 lbs/yd3 / 2,900 lbs/yd3 = 0.79 <br />• Adjusted production rate <br />900 yd3/hr (0.83)(1.8)(.75)(1.2)(0.79)= 956 yd3/hour <br />• 43,560 frZ/acre (15 feet)(] yd3/27 fr3) = 24,200 yd~/acre <br />• Dozer time required per acre = 24,200 yd~/acre / 956 yd3/hour = 25.3 hours <br />• Total estimated cost = 25.3 hours ($135/hour) _ $3,415/acre <br />314~t/~ <br />B. Mine Facilities <br />B.l East Pit Area i; l~ <br />The East Pit mine extraction area is included with the Waste Rock Disposal Area <br />reclamation costs. Surface mine developments associated with the Easy Pit were <br />backfilled and contoured to adjacent undisturbed topography. Recontoared <br />surfaces were topsoiled and revegetated with native grasses, (orbs, and tree <br />seedlings. <br />B.2 West Pit <br />The ultimate West Pit mine surface disturbance encompassed approximately 110 <br />acres consisting of mine high walls and the surface mine pit depression <br />Concurrent mine reclamation and post-mine reclamation practices have <br />eliminated the surface mine pit depression presenting apost-mine topofraphy <br />grading which maintains surface stormwater drainage. Scheduled and completed <br />reclamation activities included the reclamation of approximately 40 acr°s of mine <br />disturbance associated with the West Pit backfill and approximately ] 0 acres of <br />reclamation along the high wall benches above the backfilled azea. The following <br />provides reclatation cost estimates to complete scheduled reclamation activities <br />and the status of the various associated reclamation activities. <br />B.2.1 Benches <br />Topsoil replacement and grading of l0 acres of benches -completed <br />B.2.2 Backfilling (Waste Rock Placement) -completed <br />B.2.3 Waste Rock Grading <br />Equipment: 1 - D-8N dozer <br />Production Rate Assumptions: <br />Grading costs assumes the same grading costs (A.3) associated with topsoil <br />grading. Although, these costs assume a 10% slope adjustment rather than 1% <br />PRELIMINARY DRAFT <br />FOR DISCUSSION PURPOSES ONLY <br />