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MW DNR <br />CO% <br />June 9, 2016 <br />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 />Tony Tennyson <br />Colowyo Coal Company L.P. <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />Re: Colowyo Coal Mine (Permit No. C-1981-019) <br />Minor Revision No. 153 (MR -153) <br />Adequacy Review <br />Dear Mr. Tennyson: <br />After reviewing MR -153 from Colowyo Coal Company L.P. (Colowyo), the Division has the <br />following comment: <br />1. The Division has performed a reclamation cost estimate for the addition of two exploration <br />drilling sites near the South Taylor Pit. The total value of this estimate is $5,570.82 (see <br />attached cost estimate). The Division's cost estimate is consistent with previous cost estimates <br />approved by both the Division and Colowyo. <br />The Division has previously performed an estimate under MR -141 for the addition of three <br />exploration drill sites near the South Taylor Pit. With the proposed MR -153, the depth of <br />previously bonded exploration holes has changed as well as the number of cement bags <br />needed to plug each hole. To account for this change as well as the addition of the two <br />proposed exploration holes, the Division has taken the total proposed depth of the exploration <br />holes and total cement needed and subtracted the previous amount bonded for from MR -141. <br />This difference in total depth per hole as well as number of bags needed is what is being <br />estimated with the attached RCE as well as the labor and equipment needed for the addition <br />of the two new exploration holes. For additional clarification, please see the attached table. <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. Hickentooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />X90 <br />* 1876 <br />