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iif ~iiiiiiiniu iii <br />999 <br />DOD <br />Twentymile Coal Company <br />January 13, 2000 <br />Janet Binns <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman SUeet, Room 215 <br />Denver, Colorado 80203 <br />RE: MR 00-168, Northwest Mains Reorientation <br />Permit No. C-82-056 <br />RECEIVED <br />JAN 1, -. 2000 <br />Division o(Minerals 8 Geology <br />Dear Ms. Binns: <br />Twentymile Coal Company is requesting a minor revision to the above referenced permit to allow Cor <br />reorienting the Northwest Mains. This is required to allow for increased pillar stability resulting in <br />decreased sloughage of them. The stability issue arises from the fact that original orientation of these <br />mains was parallel to the coal cleat, which results in the increased sloughage. The new orientation will <br />have the mains driven at an angle to the cleat, which provides for better pillar stability. <br />Due [o the reorientation additional coal will be mined Crom federal lease CO-54608. Attached Table 6C <br />provides the reserve calculations for the coal to be mined from the lease. Along with this is the <br />corresponding decrease in tons mined from the adjacent fee coal. <br />The final component of this revision addresses widening of the pillars in the southern most entry of the <br />initial 1000 feet of the 11 Right gateroad. There will be no additional entries driven, just a wider pillar at <br />the western end of the 11 Right gateroad. <br />If there are questions, please contact me at you convenience. <br />Since~rely,~ yy, p/ <br />Richard Mills <br />Environmental Manager <br />attachments <br />file: 1:4etisian~ninor-rv41v00168VnA0168c1.doc <br />29515 ROUTT COUNTY ROAD #27, OAK CREEK, CO 80467 Phone: (970) 979-3900 Fax: (970) 8798050 <br />