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COMPANY L.L.C. <br />A Subsidiary of Arch Westem Bituminous Group, LLC <br />January 13, 2011 <br />MOUNTAIN COAL <br />Mr. Tom Kaldenbach 0 ' <br />Colorado Division of Reclamation Mining and Safety <br />Office of Mined Land Reclamation 44 <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No. C- 1980 -007; Quarterly <br />Summary of Subsidence Observations, 4 Quarter 2010 <br />Dear Mr. Kaldenbach: <br />Mountain Coal Company, LLC (MCC) began longwall mining the E -seam in late November <br />2008. Lonwall panel El was mined -out by 3 quarter 2010. MCC had longwall mined up to <br />cross -cut 31 in panel E2 by the end of 4 quarter 2010. The area potentially affected by <br />mining was inaccessible for the quarterly site inspection because of snow cover and <br />consequently, the ground surface was not visible. Mining was not within a mile of Monument <br />Dam or within the angle of draw of any Forest Service road. Several stock ponds were <br />undermined without any notable effects. The stock ponds will be inspected again for post <br />mining effects when road and weather conditions permit. Routine inspection reports for <br />Monument Dam, Forest Service roads, and stock ponds are included with this letter. For the <br />period of time before snow, there were no visible signs of subsidence induced features. <br />Sincerely, <br />Ryan V. Sweetwood <br />Environmental Engineer <br />cc: Doug Nolte —MCC <br />Ryan Taylor— USFS <br />Tom Kaldenbach <br />Environmental Protection Specialist Date: <br />DRMS Imaging <br />Permit: <br />Class: Reports <br />Type: Subsidence Q4 r /� <br />Name: Adequacy Memo <br />From: DRMS <br />To: Operator <br />C $o o0'7 <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 />My review found the above - referenced report <br />satisfied the requirement to submit the report <br />and the report contained the required content. <br />The report indicated no subsidence issues. <br />lam- „. * 1 876 <br />COL <br />DIVI O F <br />RECLAMATION <br />MINING <br />— &— <br />SAFETY <br />