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<br />-4- <br />SPOIL PILE 1 TO PIT 5 <br /> <br />To backfill pit 5, 533,334 yd3 of overburden must be moved from spoil pile 1. <br />From the center of spoil pile 1 to the center of pit 5 is a haul distance of <br />2,300 feet. As previously calculated, a cycle time of 7.1 minutes is required <br />for this distance. The 9B8B loader will again be waiting for a short period <br />of time between loads. With a cycle time of 7.1 minutes, 7 cycles or 14 <br />loads (7 each truck) can be hauled per 50 minute work hour. Therefare, 560 <br />LCY can be moved each hour. A total of 952 hours would be required to move <br />533,334 cubic yards. The cost breakdown for this portion of the reclamation <br />operation would be as follows: <br />2 - 7738 Caterpillar trucks: 1,904 hours @ 5230.29/hr. = 5248,072 <br />1 - 988B Caterpillar Soader: 952 hours @ 5134.14/hr. = 127,701 <br />3 - Operators: 2,856 hours @ S 15,00/hr. = 42,840 <br />TOTAL COST 5418,613 <br />SMOOTN GRADING PITS 5 AND 6 <br />A Caterpillar 16G grader will be used for smooth grading. Using the fioures <br />submitted by puinn Coal Company, at one acre smooth graded per 50 minute work <br />hour, it would take 20 hours to grade the 20 acre area of pits 5 and 6. <br />The rental cost .for a I6C grader is 520,065 per month (pq. 9-6 BB) with an hourly <br />operating cost of 525.50. The location adjustment factor (pg. 9-3 BB) is 103. <br />Therefore, the monthly rental rate would be 511,071.50. The hourlu rate, as- <br />suming a 21 working day month and 8 hour day would be 565.90. Nourly opera- <br />ting cost would be 591.40. <br />The cost breakdown for smooth Grading pits 5 and 6 is as follows: <br />1 - 16G Caterpillar grader: 20 hours @ 591.40/hr. = 51,828 <br />1 - Operator: 20 hours @ SI5.00/hr. = 300 <br />TOTAL COST 52,128 <br />REPLACEMENT OF TOPSOIL ON PITS 5 AND 6 <br />From Map V-1 a haul distance of 2,700 feet from the center of topsoil stockpile 2 <br />to the central part of pits 5 and 6 was measured. Twenty acres have to be top- <br />soiled to a depth of 2.4 feet. This results in 45,180 yd3 of topsoil that has <br />to be moved. The average capacity for a 6310 scraper (pg. 158 CN) is 26 yd3. <br />A total of 1,738 loads would have to be hauled to move the 45,280 yd3. <br />The overall grade between the topsoil stockpile and pits 5 and 6 would be 4.63 <br />(125 feet in 2,700 ft.). Effective grade would be 23 rolling resistance plus <br />4.63 grade resistance or 6.63 (see pg. 442 CN). This would apply to the Loaded <br />situation since it is uphill to pits 5 and 6 from the topsoil stockpile and <br />downhill on the return trip. This results in the following cycle time: <br />haul time - loaded (po. <br />return time - empty (pg <br />load time (pg. 166 CN) <br />maneuver and dump time <br />TOTAL CNCLE TIME <br />184 CN) <br />1B5 CN) <br />(pg. 266 CN) <br />= 2.6 minutes <br />= I.I minutes <br />= 0.7 minutes <br />= 0.7 minutes <br />5.1 minutes <br />