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Colowyo Coal Company <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />T: 970-824-1573 <br />September 7, 2011 <br />Mrs. Janet Binns <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Technical Revision — 93, Logical Mining Unit (LMU) Boundary Revision, Colowyo <br />Coal Mine, Permit No. C- 1981 -019. <br />Dear Mrs. Binns: <br />Enclosed please find two copies of a Technical Revision (TR) 93. TR -93 revised Map 2 — <br />Coal Ownership to reflect a modified Logical Mining Unit (LMU) Boundary. The LMU <br />boundary revision reflects Federal Coal Lease C -29224 and C -35874 as being relinquished <br />by Colowyo. Prior to submittal of this revision Colowyo revised the LMU Boundary with <br />the Bureau of Land Management (BLM) and received approval for the modified LMU on <br />January 11, 2011 from the BLM Little Snake office. <br />Also included is a revision application, an index sheet to ease incorporation into the <br />permit document, and a proposed public notice for TR -93. If you have any questions or <br />require additional information, please feel free to contact me at your convenience at (970) <br />824 -1532. <br />Sincerely, <br />Tony Tennyson <br />Environmental Engineer <br />End. 2 copies <br />Cc: file CF 1.1.2.77 <br />Division u, S ataJ <br />Wning <br />Colowyo Coal Company • 5731 State Highway 13 • Meeker, CO 81641 <br />T+ 1 970 824 1529 • F+ 1 970 824 1598 • http: / /prospect.riotinto.org /irj /portal <br />