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UNDERGROUND MINE FILE <br />DATE FWD. 0 9 <br />INITIALS_ <br />DEC 16 2009 <br />Coal-Mine Safety and Health <br />District 9 <br />Emmanuel Jason Davis <br />Assistant Mine Manager <br />Twentymile Coal Company <br />29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />RE: <br />Dear Mr. Davis: <br />Foidel Creek Mine <br />ID No. 05-03836 <br />Ventilation Plan Amendment <br />&irnamp I Date <br />/Z.3 9 <br />fz -?s <br />The enclosed plan amendment, dated October 31, 2009, consisting of a <br />four page cover letter and five drawings, addressing the <br />installation of a cased drill-hole, located in the sealed area of 6- <br />Right, for prep-plant thickener overflow, is approved in accordance <br />with 30 CFR §75.370(a)(1). This amendment will be incorporated into <br />the Ventilation Plan approved on June 28, 2005. <br />Be reminded that the current seals were not designed to impound <br />water or thickener material and cannot be used for this purpose. <br />Increases in water outflows at any of the 6-Right through 10-Right <br />mine seals, identified during seal examinations, shall require that <br />you stop pumping plant thickener immediately. <br />A copy of this approval shall be made available to the miners and <br />reviewed with all miners affected by this plan. <br />Sincerely, <br />/s/ Allyn C. Davis <br />Allyn C. Davis <br />District Manager <br />Enclosure <br />cc: Robert T. Johnson <br />William C. York-Feirn <br />Enclosure <br />APPROVED <br />DEC 1 6 2009 <br />CMSH