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Colowyo Coal Company <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />T: 970-824-1573 <br />August 12, 2011 Of7,EIVED <br />Mrs. Janet Binns <br />Environmental Protection Specialist AUG' 12 7011 <br />Colorado Division of Reclamation, Mining and Safetjy,,,__ ...,. . „, . .,wtwaticn, <br />Department of Natural Resources Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Technical Revision — 92, West Pit Slowdown Mine Plan and Spoil Grading Timing <br />Revision, Colowyo Coal Mine, Permit No. C- 1981 -019. <br />Dear Mrs. Binns: <br />Enclosed please find two copies of a Technical Revision (TR) 92. TR -92 revised Map 23 — <br />Mine Plan and Map 29 — Spoil Grading in the West Pit. This change updates the mine <br />plan and spoil grading plan to reflect current mining progressions and timing associated <br />with these progressions. The mining sequence in the West Pit has slowed down due to <br />coal shipments from Colowyo to contract customers and this revision captures the slow <br />down in the mining sequence for the West Pit and revises the spoil grading plan in the <br />West Pit to reflect this change in the mining sequence. <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 -92. 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 />Encl. 2 copies <br />Cc: file CF 1.1.2.76 <br />Cotowyo 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 />