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• Revision to Section 2.05.4(b) <br />Summary of Building Removal Costs <br />Concrete Removal $ 8,157 <br />Concrete Loading 1,247 <br />Concrete Hauling 654 <br />Metal Building Removal 39,120 <br />Total $49,178 <br />Mine Reclamation <br />The worst case for reclamation will be at the end of 1985. <br />Backfill of Active Pit <br />To reclaim the pit and provide drainage, 983,000 cubic yards of spoil <br />material from the permanent overburden dump and temporary stockpile will be <br />hauled back into the pit. <br />• From cross-section investigation, 638,000 yards must be moved from the <br />permanent dump and 345,000 cubic yards hauled from the temporary stock- <br />pile. The distance from the permanent dump is 3,500 feet. <br />Using a Cat 637 sc <br />Load <br />Time <br />Time <br />Dump <br />raper and the Cat handbook, production rates are: <br />Time 0.6 minutes <br />Loaded 1.6 minutes <br />Empty 1.5 minutes <br />Time 0.7 minutes <br />4.4 minutes <br />Trips per 50 minute hour = 13.6 <br />At 83% efficiency and 27 yards/load, <br />Production rate per hour = 305 cy/hr <br />638,000 cu. yds at 305 cy/hr = 2,092 scraper hours <br />Scraper dozer ratio 4:1 <br />Use 4 scrapers, 1 dozer <br />• Dozer hours = 523 hours <br />Cat 637 scrapers rent for 221.89/hr. <br />751/70/19 Revised January 1985 <br />