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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 />May 26, 2015 <br />Chris Gilbreath <br />Tri-State Generation and Transmission Association, Inc. <br />P.O. Box 33695 <br />Denver, CO 80233-0695 <br />Re: Colowyo Mine (Permit No. C-1981-019), MR -141 adequacy review <br />Dear Mr. Gilbreath: <br />I have reviewed the MR -141 submittal (received by the Division on May 4, 2015) and have one adequacy <br />issue. On the fmal page of Exhibit 23A the total depth values are less than the values for distances that are <br />not mined through. Please explain why this is correct, or correct this information. <br />If you have any questions, please contact me at 303.866.3567 (extension 8113) or Rob.Zuber@state.co.us. <br />Sincerely, <br />Robert Zuber, P.E. <br />Environmental Protection Specialist II <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 />