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r1 <br />LJ <br />• <br />• <br /> <br />PROJECT - Backfilling Open Pit <br />EQUIPMENT: 637 "D" P-P Scraper <br />ASSUMPTIONS: <br />Efficiency = 80% <br />Altitude Adjustment = 93.5% <br />RR = 6% <br /> <br />Material to fill the open pit will come from one or more overburden <br />stockpiles. <br />Average haul distance one way = 1,000' <br />PRODUCTION = 500 cubic yards/hour (Cat Handbook, p. 218) <br />ACTUAL PRODUCTION = Ideal x Alt. Adj. x Eff. <br />=500x.935x.80 <br />= 374 cubic yards/hour <br />VOLUME = 26,000 cubic yards (based on life-of-mine average) <br />TIME = 26,000 cubic yards x374 cubic yards/hour <br />= 70 hours <br />= 9 shifts <br />COST= 9 shifts x $1,683.59/shift <br />_ $15,152.31 <br />L-6 <br />