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:. COALNCOMPANY C A Cyprus Amax Company iii iiiiiiiiniii iii sss Twentymile Coal Company 29515 Routt County Road M27 Oak Creek, Colorado 80467 970-879-3800 RECEIVED ]une 30, 1999 Janet Binns Environmental Protection Specialist Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver. Colorado 80203 JUL O 1 1999 Division of Minerals 8 Geology CEIVE JUN 3 1999 Division inerals 8 eology RE: Technical Revision No. 99-33, Face Extension, Gateroad and Associated Area Development, Low Quality Coal Stockpile, Bond Reduction and Incidental Permit Boundary Change Permit No. C-82-056 Dear Ms. Binns: Twent}~nile Coal Company is requesting a technical revision to modify its current permit to allow for widening the face to 1,000 feet for panels 2 and 3 Right, develop all of the I I Right gateroad, and part of the 12 Right gateroad and associated areas, develop a limited section of the North Mains and stub in the 13 gateroad approximately 1,000 feet and construct a low quality coal stockpile at the east end of [he existing pit. Each of these will be discussed below. The face extension adds approximately 300 feet to the south of the currently permitted mining area. The extension also involves an incidental permit boundary of 7.2 acres to accommodate the new mining area. This extends the panels so [hat an additional segment of Middle Creek, approximately 400 feet, ~v~ll be undermined and subsided. TCC enlisted the services of SubTerra, Inc. to revise the subsidence projections to determine potential impacts to the creek. No significant impacts are noted. Also, the consultant reviewed the impacts to the potverlines based upon the wider panel widths and the work indicates no significant change in impacts to the powerlines. The Gateroad and associated area and the North Mains work are development only, and will not result in any impacts [o the surface. The locations of these areas are shown on Map 23. All of the development is work is done by continuous miner sections and as per TCC's typical mining sequence. The low quality coal stockpile is required for storage of this material during the late fall, winter and early spring months. In the event the material is no[ processed through the prep plant during this time it can stockpiled until the plant starts in the spring. If this schedule is followed then refuse generated from the plant will be hauled to the refuse pile during more favorable weather conditions. It is anticipated that approximately 200,000 to 400,000 tons of low quality coal will be stockpiled during the inclement weather period. The existing bond is more than sufficient to cover the cost of pushing this material into the adjacent pit. The material would not have to be transported to the refuse pile.