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III IIIIIIIIIIIIIIII <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman 51., Room 215 <br />Denver, Colorado 80203 <br />Phone: (3071 866-3567 <br />FAX 1303) A3'_-8106 <br />Date: April I5, 1998 <br />To: Jim Burnell <br />From: Harry Ranney <br />x`10 <br />a~~"I~~`1~~o b <br />~~ X./ <br />Re: Midterm Questions on Final Topography Map, Yoast Mine <br />I~~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />covcrnor <br />lames 5. Luchhead <br />E~enNo-e Director <br />Michael B. Lung <br />Drvrsion Direaur <br />Jim, per your request I performed a mass balance analysis between the existing contour map and the <br />final post mining contour map that was provided by the mine operators. Utilizing the 1996 through <br />1999 mining disturbance boundaries as the limit for the mass balance calculations, I have made the <br />following determinations: <br />1. Total inclusion azea of disturbed land: 149.13 acres <br />2. Cut volume: 7,473,504 cubic yards <br />3. Fill volume: 2,282,455 cubic yards <br />4. Coal removed, assuming uniform 12' depth: 2,887,149 cubic yards <br />All of the figures above are in bank cubic yards as no swell factor was given. The net result is that <br />the final topography map is inaccurate as far as mass balance is concerned. There is a shortage of <br />2,887,149 bank cubic yards of material which has not been appropriately accounted for. If all maps <br />that were provided to the Division reflect actual conditions, then this amount could significantly alter <br />the post mining topography. (` ~ ~ ~ p+ 2 ~ <br />~~~ y <br />Ultimately, this difference could affect the determination of the reclamation bond, so the operator <br />shoud carefully review the accuracy of the maps and make corrections where they deem necessary. <br />