2018-11-19_REVISION - C1982056 (2)

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Peabod 1111 ENERGY Twentymile Coal, LLC R'ED Nov � 9 2a�a pivision of R& Safetyton, Min,n9 29515 Routt County Road 27 Oak Creek, CO 80467 970.879.3800 Tabetha Lynch, Environmental Protection Specialist November 14, 2018 Colorado Division of Reclamation, Mining, and Safety 1313 Sherman Street, Room 215 Denver, Colorado 80203 (303) 866-3567 X8147 RE: Twentymile Coal, LLC, Foidel Creek Mine (C-82-056) — Permit Revision (PR18-12) Wolf Creek Reserve LBA Development and Mining Dear Ms. Lynch: Twentymile Coal, LLC (TC) respectfully requests CDRMS approval of a Permit Revision to our existing approved Permit, to include progressive development and longwall mining of the additional coal reserves within the Wolf Creek Coal Seam Reserve associated with a Federal Coal Lease by Application (LBA). The LBA falls within the current Foidel Creek Mine Permit Area and includes approximately 640 acres and 4.12 million tons of recoverable coal. Initial development, including development and placement of long-term support for a 3 -entry rock -slope access, development of up to six sets of gate -roads and bleeder entries to support future longwall development, and related ancillary activities, including underground dewatering activities and extension of mine ventilation and support systems, was approved and the related work completed under TR13-83. Subsequent development, mining, and related activities for the controlled fee, State, and Federal reserves, including a Federal Coal Lease Modification, were approved and are ongoing under PR14-10 and PR15-11. The requested Permit Revision addresses development and mining of all or portions of four longwall panels (the 1 - East through 4 -East Longwall Panels) as part of the overall Wolf Creek Reserve mine plan. The proposed plan modification is a logical extension of the current ongoing development and mining operations and is necessary to facilitate ongoing mining operations for the Foidel Creek Mine and to maximize recovery of the economically recoverable coal reserves and optimize the mine development sequence and mining operations in the Wolf Creek Coal Seam. Activities under the proposed mine plan modification will include underground continuous -miner development of main and sub -main entries, gate -roads, and bleeder entries; longwall mining operations; and related ancillary activities. This phase of the Wolf Creek operations will not require construction of any new surface facilities, however, longwall mining operations will result in controlled incremental subsidence of overlying areas, including areas which have previously been subsided by recent mining operations in the Wadge Coal Seam as well as limited areas which have not been previously subsided. TC has previously mined the Wadge Coal Seam in Panels 3RT through IORT in the Eastern Mining District (EMD), and 12RT through 24RT in the Northern Mining District (NMD). Mining operations are ongoing in the Wolf Creek Coal Seam in Panels 9 -East through 4 -East, with future plans to mine the 1 -East through 4 -East Panels, and the 11 -East through 14 -East Panels. The Wolf Creek reserves, which would be developed under this proposed Permit Revision, are approximately 150 feet below the Wadge Seam, and underlie Panels 7RT through 17RT in the EMD and Panels 18RT though 21RT in the NMD. Both continuous -miner development and longwall mining will utilize the same equipment