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<br />Gr~y Gap Mine <br />Backfilling pit from stockpile: <br />Owning and operating costs from pages 409 & 410 <br />No. of Pieces Equip. Type Hourly Rate Total <br />4 631D Scrapers $85.00 $340.00 <br />1 D9L Tractor Pusher 90.00 90.00 <br />1 DS,K Tractor Dozer 60.00 60.00 <br />1 Cat 14G ?tutor Grader 43.00 43.00 <br />1 Foreman 20.00 20.00 <br />7 Operators 14.00 98.00 <br />$651.00 <br />Unit cost for Backfilling: <br />Total Production <br />Assume 90% efficient. <br />From page 500 load factor <br />say 25 BCY. 25 BCY x <br />$651/hour <br />1200 C.Y./hour <br />.90 <br />54 <br />4.33 <br />_ .8 <br />4 sc <br />Pa~2 <br />(60 minutes) = 54 minutes <br />= 12.47 loads per hour. say 12 <br />estimated load = 31 C.Y. x ,8 = 24.8 C.Y., <br />capers x 12 loadsjhour = 1200 C.Y./hour <br />$.54/C.Y. <br />Total backfilling costs = <br />250,000 C.Y. x $.54/C.Y. _ $135,000.00 <br />On it cost for topsoiling: <br />From page 500, topsoil load factor = .7 <br />Add second grader = $43.00/hr. <br />Add eighth operator= 14.00/hr. <br />$57,001hr. <br />increase in topsoiling costs $ 57,00 = 8.8% <br />651.C0 <br />$.54/C.Y. (1.088) _ $.59/C.Y. <br />Conversion for load factor <br />41,000 C.Y. x $. 67/C.Y. _ $27,470.00 <br />4• <br />