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III IIIIIIIIIIIIIIII <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Rewurces <br />1313 Sherman SL, Room 215 <br />Denver, Colorado AU203 <br />Phone (3031866-3567 <br />FAx. (303) 832-8106 <br />DATE: May 22, 1996 <br />TO: Terry Acton <br />~~~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />lames 5. LochheaA <br />v /~ Executive Diredar <br />FROM: Larry Routten ~jt[ Michael B Long <br />` Division Director <br />RE: Subsidence Cracks on Florence County Rd 115 <br />After your phone call yesterday, I reviewed some of Southfield's mine records in our office. <br />I will follow up by contacting the mine today. I will ~be attending the Mined Land <br />Reclamation Board hearings in Victor today so, I cannot visit the mine site. I will call you <br />later today. <br />Based on the mine records, it appears the area of the road cracks you described to me is <br />over an area which was retreat mined in 1995, which would lead to surface cracking and, <br />possibly settling of 2-3 feet. These impacts are predicted in the mine permit. Surface <br />cracking was observed in the road west of the area you described just last year when retreat <br />mining was done under that portion of the road. EFCI reportedly regraded that portion of <br />the road. Surface cracking and some settling of the road are the only subsidence impacts <br />anticipated for road 115, and the mine is responsible for repairing any damage to the road. <br />A subsidence monument very near to the same area subsided 0.48 feet between November, <br />1994 and May, 1995. <br />According io mine maps in our office, there are no abandoned mine workings in the area <br />where you observed the cracks. Therefore, I would not anticipate any features such as the <br />hole which expressed itself recently [o the west and next to the road. That hole was <br />apparently connected to old mine workings near the surface. The area you described <br />yesterday is several hundred feet northwest of the Canon Liberty workings, and several <br />hundred feet west of the Double Dick and Canon National Mines. The Southfield mine <br />workings under this portion of the road are approximately 420 feet below the surface. <br />c: \wp51 \052296 <br />