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Peabody <br />Twentymile Coal Company <br />29515 Routt County Road M27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />July 5, 2007 <br />Mr. Byron Walker <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />(303) 866-4941 <br />RE~~~O~ED <br />JUL 18 2001 <br />DIVISIpn of ~nrE?mati0n, <br />Mining and Safety <br />Re: Twentymile Coal Company - Foidel Creek Mine (Permit No. C-82-056), Minor Revision (MR07- <br />218) - 6MN Emergency Escape Hoist <br />Dear Mr. Walker: <br />Twentymile Coal Company (TCC) requests CDRMS approval of a Minor Revision to our approved Permit <br />for construction/installation, operation, maintenance, and reclamation of an emergency escape hoist for the <br />6-Main North (6MN) Shaft. Installation of the emergency escape hoist will provide a means of rapid <br />emergency egress from the mine in close proximity to current and future active working areas, as shown on <br />the Mine Plan Map, Map 23. The planned 6MN Emergency Escape Hoist will be constructed entirely <br />within the existing 6MN pad area, will result in no new surface disturbance, and will not affect existing <br />drainage and sediment control structures. Construction will involve: <br />• Erection of apre-fabricated steel hoist-frame and bull-wheel, approximately 10 x 22 x 25 feet high <br />over the existing bMN Ventilation Shaft, tying into the existing concrete shaft collar <br />• Fabrication of a steel frame and expanded metal shaft landing and access stairs, tying into the hoist- <br />frame <br />• Fabrication of a similaz shaft landing at the bottom of the shaft <br />• Installation in the shaft ofguide-ropes for the hoist cage <br />• Excavation for the hoist-house foundation <br />• Forming and pouring of the 20 x 30 foot reinforced concrete hoist-house foundation <br />• Installation of the hoist motor, winch, and associated control equipment on the hoist-house <br />foundation <br />• Erection of the pre-fabricated steel hoist house <br />• Stringing of hoist cable and placement and connection of the 3 x 5 x 8 foot high pre-Fabricated hoist <br />cage <br />• Electrical connections (from existing power distribution line) and testing of hoist <br />• Installation of appropriate equipment guards and fencing <br />At such time as the 6MN Emergency Escape Hoist is no longer needed to support ongoing or future mining <br />and related operations, the hoist components will be disassembled and salvaged for re-use or will be <br />demolished, and the associated disturbance areas reclaimed as part of final reclamation for the 6MN Shaft <br />installation. <br />G:\Environmental\REVISION\MINOR-RV\MR07-218 6MN Escape Hoist Installation\MR07-218 Transmittal Ltr.doc <br />