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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 />Denver, Colorado 80203 <br />Phone: (303) 866.3567 <br />FAX: (303) 832-8106 <br />December 22, 2010 <br />Kathleen G. Welt <br />Mountain Coal Company, LLC <br />P.O. Box 591 <br />Somerset, CO 81434 <br />Re: West Elk Mine <br />Technical Revison No. 124 (TR-124) <br />Addition of Maximum Projected Areal Extent of Potential Mining <br />Dear Ms. Welt: <br />COLORADO <br />D I V I S I ON Of <br />RECLAMATION <br />MINING <br />SAFETY <br />Bill Ritter, Jr. <br />Governor <br />Mike King <br />Executive Director <br />Loretta E. Pineda <br />Director <br />The DRMS has completed a preliminary review of the above-referenced submittal and has the following <br />comments. <br />1. Please either add to the permit application or direct us to baseline seep and spring information for <br />the parts of the Projected Potential Mining Area that have not previously been approved. <br />2. Please leave the descriptions of panel dimensions and orientations unchanged on existing <br />previously approved permit pages 2.05-119 and 2.05-120 (with the exception of updating <br />numerical values on these pages, where needed). These detailed descriptions of the underground <br />workings are needed to ensure compliance with Rule 4.20.1(3). <br />3. In the Notes on Map 51, please replace the words "permit boundary" with "Projected Potential <br />Mining Area". Capital letters are suggested to emphasize the Projected Potential Mining Area is a <br />formally defined area. <br />4. Please change "the coal lease and permit boundaries" on pages 1 and 2 of Exhibit 55B and on <br />page 1 of Exhibit 60E to "Projected Potential Mining Area". <br />5. Please change "actual mineable coal limit or the lease and permit boundaries is reached <br />(whichever is first)" on page 1 of Exhibit 60E to "anywhere within the Projected Potential Mining <br />Area". <br />6. Please clearly state on page 1 of Exhibit 55B and page 1 Exhibit 60E that the subsidence <br />evaluation included the entire Projected Potential Mining Area as shown on Map 51 in the permit <br />application, if such a statement is accurate. <br />7. Are the "expected" subsidence impacts to the Minnesota Creek Ditch Rider's cabin that are <br />described on page 46 of Exhibit 60E the same as the "worst possible consequences" for the cabin <br />that may be caused by subsidence? Rule 2.05.6(6)(b) requires a description of the worst possible <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction 9 Durango Active and Inactive Mines