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1~ECEIVED <br />JUN 0 8 2007 <br />Division of Reclamation, <br />Mining and Safety <br />June 5, 2007 <br />Mr. Carl Johnston <br />Office of Surface Mining, Reclamation and Enforcement <br />P.O. Box 46667 <br />Denver, Colorado 80201-4667 <br />RE: CDMG Decision to Approve Technical Revision No. 63 (TR-63). Revision to Update <br />the Post Mining Topography, Colowyo Coal Mine, Permit No. C-81-019. <br />Deaz Mr. Johnston, <br />Colowyo submitted one revision to our permit, identified as TR-63; which was approved by <br />Colorado Division of Reclamation, Mining, and Safety (CDRMS) on June 1, 2007. Enclosed <br />you will fmd one (1) copy of the revision containing the revised text and maps. Given the size of <br />this change, the materials are subdivided into several envelopes corresponding to the various <br />permit volumes. <br />Enclosed you will also find the CDRMS approval letter, the Decision Form, a copy of the public <br />notice, and a change of index sheet to ease the incorporation of this revision into the Permit. <br />If you have any questions or just require additional information, please do not hesitate in <br />contacting me at (970) 824-1532. <br />Sincerely, <br />T ny Tenn son <br />Environmental Engineer <br />Encl. 1 copy <br />Cc: file 1.1.2.52 <br />Jim Stazk, CDMG (w/o attaclunents) <br />Antelope Mine Colowyo Mine Cordero Rojo Mine Jacobs Ranch Mine Spring Creel: Mine <br />H member of the Rio Tinto Greup <br />