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MOUNTAIN COAL <br />COMPANYL.L.C. <br />A Subsidiary of Arch Westem Biturrnous Group, LLC <br />January 24, 2010 <br />r, Y <br />0 (e?sa?e'N <br />?F. 0 <br />'o9 aid <br />00s?oMXn <br />Mr. Carl R. Johnston <br />Office of Surface Mining, Reclamation and Enforcement <br />1999 Broadway, Suite 3320 <br />Denver, Colorado 80202 <br />West Elk Mine <br />P.O. Box 591 <br />5174 Highway 133 <br />Somerset, CO 81434 <br />(970) 929-2200 <br />Fax (970) 929-5050 <br />Owls, <br />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No. C-1980-007; <br />Approved Technical Revision No. 123 (TR-123) <br />Dear Mr. Johnston: <br />Attached are copies of two maps, entitled "Proposed 2011 MDW Drilling" and "E-seam MDW <br />Drilling Plan", as well as the CDRMS Reclamation Cost Estimate for TR-123 that was recently <br />approved. Please add the maps behind tab "TRA 23" in Exhibit 80 and add the cost estimates <br />to Exhibit 53. <br />Please feel free to contact me should you have questions regarding this information. <br />Sincerely, <br />hg?* '9? <br />Kathleen G. Welt <br />Environmental Engineer III <br />cc: Desty Dyer - BLM w/ attachment <br />Tom Kaldenbach - CDRMS