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Revision to Section 2.05.4(b) <br />2,092 scraper hours = $464,194 <br />D-9 Dozer with "U" Blade rents for $160.54/hr. <br />523 dozer hours = $83,962 <br />Summary of Backfilling Costs <br />Scrapers = 464,194 <br />Dozer = 83,962 <br />$548,156 <br />Temporary Overburden Stockpile <br />The temporary overburden stockpile will also be hauled back into the pit. <br />The 345,000 cubic yards from the temporary stockpile will increase the <br />total backfill into the pit to 983,000 cubic yards. <br />The haul distance is 1500 feet with a level grade. <br />• Using a <br />Load <br />Time <br />Time <br />Dump <br />~at 637, the production is as follows: <br />Time 0.6 minutes <br />Loaded 0.8 minutes <br />Empty 0.7 minutes <br />Time 0.7 minutes <br />2.8 minutes <br />Trips per 50 minute hour = 17.9 <br />At 83% efficiency and 27 cubic yards/load, <br />Production rate per hour = 400 cy. <br />345,000 cubic yards at 400 cy/hr. = 863 scraper hours <br />863 scraper hours x $221.90/hr. _ $191,500 <br />216 dozer hours x $160.54/hr. = 34,677 <br />$226,177 <br />Reduction of Pit Slopes <br />• A total of 134,000 BCY will have to be dozed along the east and south high- <br />wall. 22,000 yards must be moved along the east highwall and 112,000 BCY <br />along the south highwall. <br />751/70/20 Revised January 1985 <br />