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<br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />7373 Sherman St., Roam 275 <br />Denver, CO 80203 <br />303 8663567 <br />FA X: 303 832-6706 <br />STATE OF CC ~~~ ~~~~~~~~~~~~~ ~~~ <br />OF ~a(p <br />~0 - <br />New ,--, ~g <br />~y876 <br />Roy Romer. <br />Governor <br />Fred R. Banta, <br />DrviSion Director <br />February 10, 1992 <br />Mr. Allen Weaver <br />Energy Fuels Coal, Inc. <br />P.O. Box 449 <br />Florence, Colorado 81226 <br />RE: Subsidence Reports, 11/89 through 4/91, Southfield Mine, C-81-014 <br />Dear Mr. Weaver: <br />The Division would like to acknowledge receipt of the Southfield subsidence <br />reports. The Division has had an opportunity to review them and basically <br />agrees with the reported conclusions. <br />The permit application projected an angle of draw between 20° and 25°~ the <br />information collected on the intensive grid suggests a 29° angle of draw, as <br />reported,'fhe Division recommends that the "predicted areal extent" line on Map <br />17, Mine Plan Map, be modified to reflect this larger angle of draw. <br />The Division also had additional recommendations for future reports. Prepare <br />a Mine Plan Map which shows the type and extent of current underground <br />workings as well as lineation of the mined seam (Jack O'Lantern vs. Red <br />Arrow). Please put a bar scale on the cross sections so that changes in scale <br />due to replication can be identified. Lastly, a plot of the angle of draw on <br />the cross sections would be helpful. <br />As an additional aside, our geotechnical specialist, Bruce Stover, suggests <br />that future subsidence grids which would be used to determine angle-of-draw, <br />be placed partially outside the predicted affected area, so as to have a <br />scientific control. <br />Sincerely, <br />' ~ ~ ~~cJ <br />C~~~ , <br />Catherine W. Begej <br />Reclamation Specialist <br />CWB/yjb <br />~~~ <br />1261E <br />