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MOUNTAIN COAL COMPANY <br />WEST ELK MINE \ ~ ; <br />P.O. Box 591 \ <br />Somerset, CO 81434 <br />Phone: 1970) 929-5015 <br />Fax: 1970) 929-5050 <br />RECEIVED <br />May 14, 1998 <br />Mr. Michael Boulay MAY 1 g 1998 <br />Colorado Division of Minerals 8 Geology Division Of ANinerals & Geology <br />1313 Sherman Street, Room 215 p. <br />Denver, CO 80203 <br />RE: Mountain Coal Company 1997 Annual Subsidence Monitoring Report (Year-end Report); West Elk <br />Mine; Permit No. C-80-007 <br />Dear Michael: <br />With this letter Mountain Coal Company (MCC} is submitting three copies of the 1997 Year-end Subsidence <br />Report. The report addresses the information requested in the format approved by the Division as a result of <br />Minor Revision No. 96. The report includes profiles, a discussion of the survey schedule, mining advance, <br />subsidence results, and visual effects. Tables of the subsidence monitoring data are also included. These <br />tables show the northings, eastings, pre-mining elevations, survey elevations of the current monitoring, previous <br />(July 1997) elevations, and the subsidence for the current reported period (July 1997 to October 1997) and total <br />subsidence. <br />The 1997 Year-end Subsidence Report also addresses the concerns the Division raised in correspondence, <br />dated August 28, 1997 and October 22, 1997. The main concern expressed in the two letters was in regard to <br />the limited information provided on visual observations of subsidence features. MCC has taken the Division's <br />recommendations into consideration for the preparation of the 1997 Year-end Subsidence Report. MCC has <br />collected mare specific information regarding visual observations made on subsidence cracks, which was <br />completed by MCC's contractor, and is included with the report. In addition, MCC has provided a map in the <br />1997 report which shows the location of the features observed. Aerial photographs have also been provided. <br />MCC would appreciate receiving a copy of the Roadside Mine's visual monitoring report, as offered by Jim <br />Pendleton in his memo to you. This will assist MCC in ensuring that future reports meet the Division's <br />expectations. <br />If you have any questions please contact me or Kathy Welt. <br />Sincere , <br />Henry A. rbe <br />Environm tal Coordinator <br />Enclosures: Subsidence Profiles <br />Mine Advance Map <br />Subsidence Tables <br />Results of Fieid Investigations on the North Face of Jumbo Mountain (August 6, 1997) <br />1 Set Intrasearch Aerial Photographs (Stereo Pairs) 10/9/97, 21 Photos (3741-53 through 3741-72) <br />xc: C. Johnston <br />A. Schmidt <br />K. Welt <br />