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Bulldozer, (250 HP), projected efficiency, grading operations, 500 tons/hr <br />10000 tons/500 tons/hr = 20 hrs @ $140 = $2800 <br />Topsoil disking, chiseling, or contour furrowing in preparation for seeding <br />Tractor O&O $ 80/hr, 10000 tons will cover app. 16.8 ac @ 6" depth $1344 <br />Subtotal, Direct Cost, Topsoil Recovery, Stockpiling, and Application Costs, <br />Sitewide, Life of Mine Projection ....................................... $104, 266 <br />Grading and Backfilling Cost Estimates, by Area <br />Lower (southern) Waste Rockpile <br />At maximum extent of construction, the southern waste rockpile will total 5 acres of <br />southern facing slope and level bench top grading 1 ° to lower pit azea. <br />Bulldozer Grading, 5 acres x 43560 sq ft/ac = 217800 sq ft / 12 feeU pass =18150 ft <br />18150 lineaz feet / dozer speed .3mi/hr (1584 ft/hr) = 12 hours @ $140 = $1680 <br />Double dozer hours for cycle time return to top of slope... $1680 <br />Bulldozer Final Grade/Contour Furrow Installation, same area, same eff. _ $1680 <br />At maximum extent of mine development, a zone within the affected land boundary <br />Paralleling the marble bed outcrop app. 2100' long and 400' (20 acres) wide will be <br />used for waste rock and topsoil stockpile areas. Waste rock will be pushed into the <br />marble bed cut at the completion of mining to result in slopes no steeper than 3:1 and <br />topsoil will be hauled and placed on top of the final graded waste rockpile, as per above <br />topsoil handling estimates. Final grading of waste rock azea will include pushing rock <br />into the mining cut and grading the waste rock to the east (after topsoil stockpile is hauled <br />away) to result in final grade of 3:1, prior to topsoil application. <br />Area to be final graded: 20 acres, bulldozer speed and efficiency as above; <br />20 acres x 43560 sq ft/ac = 871200 sq ft / 12' pass = 726001ineal ft / 1584ft/hr = <br />46 hrs x 2 (return cycle time) = 92 hours @ $140 $12880 <br />Area to be contour furrowed: 20 acres, bulldozer speed and efficiency as above = <br />46 hours @ $140 = $6440 <br />Subtotal, Dozer Grading of Waste Rockpiles, Life of Mine $24360 <br />26 <br />