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Storage Pad No. 4 <br /> This pad is located near Mines 1 and 2. The pad is almost flat, with 10 feet of <br /> fill on the west side and 10 feet of cut slope on the east side. The surface area <br /> is 1.14 acres. Therefore, 0.57 acres has to be backfilled to an average depth <br /> of 5 feet. <br /> The average push distance would be approximately 150 feet, thus a D9U could push <br /> approximately 2,000 LCY/hr. A volume of 4,598 yd3 must be moved. The following <br /> are the factors which will affect production (pgs. 42, 43, 500 - CH) : <br /> Con di ti on Factor <br /> Average Operator 0.75 <br /> Rock Material 0.70 <br /> 50 min, work hour 0.84 <br /> Grade factor .2% 0.99 <br /> Altitude deration .0.94 <br /> Overall Factor 0.41 <br /> With a production factor of 0.41 and a production rate of 1,000 LCY/hr. , it would <br /> require a D9U 11 hours to complete this operation at the following cost: <br /> 1 D9U dozer: 11 hours $ $127.00/hr. = $1,397.00 <br /> 1 Operator: 11 hours @ $ 15.001hr. = $ 165.00 <br /> TOTAL COST $1,562.00 <br /> Mine No. 3 <br /> There are three separate areas to be backfilled at Mine No. 3, the mine bench, the <br /> upper bin bench and the lower bin bench. The mine bench has an acreage of 4.86 <br /> and must be -backfilled to an average depth of 27.13 feet, thus 212,720 yd3 must be <br /> moved. The average push distance for a D9U would be 250 feet. The unadjusted <br /> production for this push distance (pg. 41, CH) would be 650 LCY/hr. The factors <br /> affecting production are: <br /> Condition Factor <br /> Average Operator 0.75 <br /> Rock Material 0.70 <br /> 50 min. work hour 0.84 <br /> Grade Factor 30% 0.40 <br /> Altitude deration 0.94 <br /> Overall Factor 0.17 <br /> With a production factor of 0.17, the production ,rate- for a D9U is Ill LCY/hr. <br /> Therefore, it would take 2�896 hours to complete this backfilling operation at <br /> the following cost: <br /> 19-7 <br />