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<br /> <br /> <br /> <br />Jessica Wilczek, P.E. <br />Manager of Engineering and Environmental Affairs <br />jwilczek@archrsc.com <br />Phone: 970.929.2308 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />April 8, 2024 <br /> <br />Mr. Leigh D. Simmons <br />Colorado Department of Natural Resources <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br /> <br />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No. C-1980-007; <br />Technical Revision No. TR-153, Drill a 19” pilot hole from the surface at Deer Creek <br />Shaft to the B Seam horizon. <br /> <br />Dear Mr. Simmons: <br /> <br />Mountain Coal Company, LLC (MCC) submits this cover letter, application, public notice, <br />construction figures and revised Map 53D for Technical Revision No. 153. <br /> <br />This project will construct a one foot thick 10’ x 27’ concrete pad on the Deer Creek ventilation <br />shaft site to be used as a drill pad. A 19” pilot hole will be drilled, grouted, and cased with 16” <br />I.D. steel from the surface to the E Seam horizon and continue uncased to the B Seam horizon. <br />This will allow for the construction of a 22’ diameter raise bore ventilation shaft between the B <br />and the E Seams. This ventilation shaft will be lined with a 12” concrete liner immediately <br />following boring for a final diameter of 20’. <br /> <br />The pilot hole will be capped with a valve for possible future use. <br /> <br />At the time the B to E Seam ventilation shaft is no longer needed seals will be constructed in the <br />three E Seam entries to close off the shaft. <br /> <br />Please contact me with any questions regarding this submittal. <br /> <br />Sincerely, <br /> <br /> <br /> <br /> <br /> <br />Jessica Wilczek, P.E. <br />Manager of Engineering and Environmental Affairs <br /> <br />CC: Weston Norris- MCC <br /> Cathie Pagano- Gunnison Co. <br />