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Mine No. 2 <br /> The Mine No. 2 bench is 1.19 acres. From the cross-section, it was determined that <br /> the average backfill depth is 9.25 feet. Therefore, a total volume of 17,759 yd3 <br /> must be moved. The average push distance will be 75 feet. The unadjusted pro- <br /> duction rate for a D9U is 1,700 LCY/hr. The production factors are the same as <br /> determined for the Mine No. 1 bench (0.11) . The adjusted production rate would <br /> be 187 LCY/hr. Therefore, it would take 95 hours to complete this portion of the <br /> backfilling operation at the following cost: <br /> 1 - D9U dozer: 95 hours @ $127.00/hr. = $12,065.00 <br /> 1 - Operator: 95 hours @ $ 15.00/hr. = $ 1,425.00 <br /> TOTAL COST: $13,490.00 <br /> Pad No. 3 <br /> Pad No. 3, which is the location of the storage bin from Mine No. 2, is 0.46 <br /> acres. From Map V-E-lb, it was determined that Pad No. 3 would have to be back- <br /> filled to an average depth of 10.6 feet. Therefore, 7,867 yd3 of material would <br /> have to be moved. The average push distance is 175 feet at a 25% slope. The <br /> unadjusted production rate for a D9U is 900 LCY/hr. All adjustment factors <br /> previously noted are the same, with the exception of the grade factor (25o) , which <br /> brings the overall adjustment factor to 0.22. The adjusted production rate for a <br /> D9U is 198 LCY/hr. This portion of the backfilling and grading operation would <br /> be completed in 40 hours at the following cost: <br /> 1 - D9U dozer: 40 hours @ $127.00/hr. = $5,080.00 <br /> 1 - Operator: 40 hours @ $ 15.00/hr. = $ 600.00 <br /> TOTAL COST: $5,680.00 <br />