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MID-CONTINENT RESOURCES, INC. <br /> PRODUCERS OF THE FAMOUS COAL BASIN COKING COAL <br /> BOX 158 <br /> CHICAGO OFFICE CARBONDALE, COLORADO 81623 <br /> TELEPHONE <br /> 105 ADAMS STREET 1303I963-2581 <br /> CHICAGO 60603 TWX <br /> September 12, 1983 9109296894 <br /> RECEIVED 910 929 6897 <br /> Mr. Jim Herron <br /> Mined Land Reclamation 41983 <br /> 423 Centennial Bldg. <br /> 1313 Sherman St. <br /> Denver, Colorado 80203 MINED LAN ECN M"T'ResourcesO <br /> Colo. Dept. <br /> Subject: Coal Basin Mines: File No. C-017-81 <br /> Subsidence Monitoring Network <br /> Dear Mr. Herron: <br /> I am writing you because I believe a revision to the subsidence monitoring provi- <br /> sions of our approved mine plan is appropriate and necessary at this time. <br /> Subsequent to the establishment of our subsidence monitoring network, several <br /> unanticipated events have occurred at our mines which have caused me to <br /> re-evaluate our subsidence monitoring program. I refer to the following events: <br /> 1. Coal production has been approximately 50 percent less than anticipated <br /> because of the weak market for metallurgical coal. <br /> 2. The multilift longwall mining demonstration project was relocated to <br /> the Dutch Creek No. 1 mine. Mining operations have begun. <br /> 3. The cessation of mining in the L. S. Wood No. 3 Mine on August 1, 1982 <br /> and the Coal Basin No. 5 Mine on August 1, 1982. <br /> 4. The DOE/USBM contract for detailed subsidence monitoring over the <br /> multilift longwall project at No. 3 Mine was cancelled and most of the <br /> monitoring points removed (by the USBM without our prior knowledge) . <br /> 5. Surface subsidence of up to 1.27 feet occurred during the interval of <br /> August, 1981 through August, 1983. (See enclosed copy of Mine <br /> Subsidence Engineering Co. , Inc.) <br /> 6. Our request for a "surface subsidence release" from the U. S. Forest <br /> Service for forest lands adjacent to our mine plan area was denied. <br /> At present, I do not think a determination of the "angle of draw" or the posi- <br /> tion of the U. S. Forest Service concerning adjacent lands are of first-order <br /> importance, because it will be several years before underground mining operations <br /> approach the permit boundary and because I believe that following additional <br /> investigation and field observations the Forest Service will reconsider their <br /> initial position concerning subsidence on the forest lands adjacent to the <br /> present mine plan area. <br />