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&COAL <br />COMPANY _,�t a� <br />•A � O ng PHODOCTt <br />5731 State Highway 13 ♦ Meeker, Colorado 81641 ♦ 970- 824 -1500 <br />ID <br />July 27, 2012 <br />Mr. Rob Zuber e'� <br />Environmental Protection Specialist <br />1 <br />Colorado Division of Reclamation, Mining and Safety ��oER Say -• <br />Department of Natural Resources VN <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Colowyo Coal Company L.P., Mine Permit C -81 -019, Preliminary Adequacy Review, <br />Permit Renewal 6 (RN -06) <br />Dear Mr. Zuber, <br />Colowyo Coal Company L.P. (Colowyo) received preliminary adequacy review comments <br />from the Division of Reclamation, Mining and Safety (Division) on May 29, 2012. <br />Colowyo submitted responses to the Division's preliminary adequacy review on July 27, <br />2012. Under that cover, Colowyo requested additional time to prepare information for <br />comment 8, Reclamation Cost Estimate. Enclosed please find Colowyo's response to <br />comment 8. <br />8. Reclamation Cost Estimate <br />Please provide updated mass balance information for volume of the East Pit, West Pit, <br />and South Taylor Pit remaining to be backfilled; these should reflect the worst case <br />scenario for the 2012 — 2017 permit term. Upon update of these volumes, the Division <br />will complete its evaluation of the current Reclamation Cost Estimate. <br />Response Colowyo has prepared an estimate of volumes for the West Pit and South <br />Taylor Pit which reflect the worst case as of November 2017. Attached Figure 1 has been <br />prepared to identify the approximate pit configuration and reclamation bond <br />requirements for the Colowyo Mine as of November, 2017. At this time, all mining has <br />been completed in the West Pit. Map 29 has been used to identify areas which have been <br />backfilled and graded (and subsequently reclaimed) as of this point in time. Area 1 on <br />Figure 1 identifies the approximate extent of the unreclaimed portion of the West Pit, <br />mine facilities, and coal haul road. <br />Within the South Taylor Pit area, mining will have progressed significantly by November <br />2017. The mining sequence was used to identify the approximate South Taylor pit <br />configuration shown. This sequence assumes that mining has progressed through the <br />November, 2017 time frame. At this point in time, a substantial quantity of backfill has <br />A Western Fuels - Colorado, LLC ruining property <br />