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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />0 <br />C O L O R A O <br />Denver, Colorado 80203 o N o <br />Phone: (303) 866-3567 RECLAMATION <br />FAX: (303) 832-8106 MINING <br /> <br />January 21, 2011 SAFETY <br /> <br /> <br />Ryan Sweetwood <br />Hickenlooper <br />Governor <br />LLC <br />Mountain Coal Company <br />, Mike King <br />P.O. Box 591 Executive Director <br />Somerset, CO 81434 Loretta E. Pineda <br /> Director <br />Re: West Elk Mine <br />Report titled "Spring 2010 Subsidence and Geologic Observations" <br />Dear Mr. Sweetwood: <br />The DRMS has reviewed your email memo of January 11, 2011 in which you responded to our <br />adequacy review letter of December 29, 2010. The email satisfied our comments 1 and 2 in the letter. <br />Based on the information in your responses, we have the following additional comment. <br />3. The representative angle of draw for longwall panel E-1 may be nearer 18.3 degrees, than the <br />15 degrees mentioned on page 2 of Appendix B of the above-referenced report, based on the <br />information shown in the table below. (Page 2 says Station 101 is given the greatest weight.) <br />Monument Ground Top of E- Vertical Horizontal Vertical Angle of <br />Grid Used elevation, feet seam, feet Distance Distance Distance Draw <br /> (Appendix B of (Map 17 in (feet) (feet) (feet) (degrees) <br /> subsidence permit) <br /> report) <br />Station 10 8009 6890 1119 340 1119 16.9 <br />Station 37 Table 1 vertical distance appears accurate 340 1360 14.0 <br />Station 57 Table 1 vertical distance appears accurate 290 1150 14.2 <br />Station 80 Table 1 vertical distance appears accurate 290 1150 14.2 <br />Station 101 7950 6800 1150 380 1150 18.3 <br />Please verify the accuracy of the following values in your previously submitted Table 1 of <br />Appendix B: the vertical distances for Stations 10 and 101, and the horizontal distances for <br />Stations 10, 37, and 101. If changes to the values are needed, then please revise Appendix B, <br />accordingly. <br />Sincerely, <br />/ ?-+1 k4, <br />Tom Kaldenbach <br />Environmental Protection Specialist <br />cc: Dan Hernandez, DRMS <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines