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West Elk Coal Company, Inc. <br />post Olfice Box 591 <br />Somersei. Colorado Bt434 <br />Telephone 303 929 5015 <br />April 6, 1988 <br />Susan Mowry <br />Colorado Mined Land <br />Reclamation Division <br />1313 Sherman Street <br />Denver, CO 80203 <br />III IIIIIIIlIIIIIIlI <br />999 <br />,. <br />l;l~l~ ~ ,_.o <br /> <br />Re: Subsidence Monitoring, Mt. Gunnison No. 1 Mine, <br />CMLRD Permit No. C-007-80. <br />Dear Susan: <br />Please find enclosed three copies of the Subsidence <br />Monitoring Data for the monuments located above the <br />1W15 panel, 1W2S panel, and South Main Intake <br />development entries. <br />~~ <br />Included in the data are two pre-mining surveys, <br />three surveys completed while panel 1W15 was being <br />retreat mined, and two post mining surveys completed <br />while panel 1W2S was being mined and after 1W15 panel <br />was completely mined out. <br />Two surveys will be performed in 1988, as weather <br />permits, and are planned for late April and <br />September. <br />A cursory look at the monitoring data to date shows a <br />maximum subsidence on the order of 1.9 feet in the <br />middle of panel 1W15, 2.2 feet in the middle of panel <br />1W2S, and no apparent movement over the South Main <br />Intake development entries. <br />West Elk Coal Company is in the process of evaluating <br />the subsidence monitoring data, as well as continuing <br />to collect additional data. West Elk Coal Company <br />will submit an evaluation of the data to the Division <br />when it is completed. The evaluation should be <br />completed by mid to late summer, 1988. <br />-~~. c~:.c_. <br />