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-12- <br /> Mine No. 5 <br /> From cross-section V-E-le, it was determined by the Division that two areas would <br /> have to be backfilled; the lower bench area where the bin is located, and the <br /> portal bench. Material to backfill these areas will come from the portal bench <br /> fill. Material will be pushed up to cover the highwall and down to backfill the <br /> lower bench. <br /> A D9U will be required to push 74,213 yd3 up to the highwall. The average push <br /> distance is 125 feet, therefore, the unadjusted production would be 1,200 LCY <br /> The adjustment factors are as follows: <br /> Condition Factor <br /> Average Operator 0.75 <br /> Rock Material 0.80 <br /> 50 Minute working hour 0.84 <br /> Unfavorable Grade Factor 0.40 <br /> Altitude deration 0.94 <br /> Overall Factor 0.19 <br /> The adjusted production rate is 228 LCY/hr, therefore, it would require 325 hours <br /> to complete this portion of the backfilling operation. <br /> To backfill the lower bench, a D9U would have to move 70,987 yd3 of material with <br /> an average push distance of 125 feet. The 1,200 LCY/hr. production rate is <br /> adjusted by the following factors: <br /> Condition Factor <br /> Average Operator 0. 75 <br /> Rock Material 0.80 <br /> 50 Minute working hour 0.84 <br /> Favorable Grade 1.30 <br /> Altitude deration 0.94 <br /> Overall Factor 0.62 <br /> The adjusted production rate is 744 LCY/hr. Therefore, it would require 95 hours <br /> to complete this portion of the backfilling operation. <br /> The total cost for backfilling Mine No. 5 is as follows: <br /> 1 - D9U dozer: 420 hours @ $127.001hr. _ $53,340.00 <br /> 1 - Operator: 420 hours @ $ 15.00/hr. _ $ 6,300.00 <br /> TOTAL COST: $59,640.00 <br />