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COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />June 4, 2014 <br />Jerry Nettleton <br />Twentymile Coal Company <br />29515 Routt County Road #27 <br />Oak Creek, CO 84067 <br />RE: Foidel Creek Mine, Permit C- 1982 -056 <br />Technical Revision No. 83 (TR -83) <br />Second Adequacy Review <br />Dear Mr. Nettleton: <br />The Division received Twentymile Coal, LLC's (TC's) application for a technical revision (TR -83) on <br />January 28, 2014. The application was determined to be complete on February 6, 2014. The Colorado <br />Division of Reclamation, Mining and Safety completed its preliminary adequacy review of the proposed <br />technical revision in a letter dated March 6, 2014. The Division received responses to the Division's <br />adequacy comments on May 20, 2014. Please respond to the following comments or concerns as <br />necessary: <br />1. Division's intital comment - Based on the proposed revised pages 2.04 -16, 16.1 and 16.2, <br />proposed Exhibit 53 provides information of the Wolf Creek Reserve Geologic and Mine Plan <br />information. The information provided in Exhibit 53 is inadequate to address Rule 2.04.6. Per <br />Rule 2.04.6(3)(a) the geology description for underground mining shall include a separate <br />description of the coal to be mined including a map and cross sections prepared to the standards <br />of 2.10. Please provide the following: <br />Rule 2.04.6(3)(a)(i) - A description including an appropriate map and cross sections prepared to <br />the standards of 2.10 which shows the nature, depth, and thickness of the Wolf Creek Coal Seam <br />and any rider seams above the Wolf Creek Seam to be mined. Please note that drawing #1 of <br />Exhibit 53 identifies the Wolf Creek Seam Typical Geologic Column; however, this column differs <br />from the approved Figure 2 stratigraphic column. In addition the proposed Map 23 identifies the <br />overburden thickness of the Wadge Coal Seam and not the Wolf Creek Coal Seam. <br />Rule 2.04.6(3)(a)(ii) - A geologic map with geologic cross sections of the Wolf Creek Coal crop <br />lines and the strike and dip f the Wolf Creek Coal. <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http: / /mining.state.co.us <br />John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />-'c��a <br />1876 <br />