Laserfiche WebLink
Sanborn Creek Project Page 3 August 21, 1992 <br />• <br />EXECUTIVE SUMMARY <br />Advance mining in the Sanborn Creek Mine should not breach the <br />approximately 190 feet of interburden between the overlying, <br />abandoned Oliver No. 1 Mine "D" Seam workings and the Sanborn Creek <br />Mine "C^ and "B" Seam workings. Zt would be necessary to <br />physically breach the interburden to produce an inrush of water <br />from the probably flooded Oliver No. 1 Mine. it should be possible <br />to drive mains, sub-mains and to achieve 50 percent room and pillar <br />panel extraction in those parts the "C" and "B" Seams in the <br />Sanborn Creek Mine overlain by the Oliver No. 1 Mine without <br />drainage of any of the water that is probably impounded in the <br />abandoned Oliver No. 1 Mine "D" Seam workings (Babcock & Hooker, <br />1977). However, high-extraction pillar robbing during retreat from <br />mine panels in the "C" and "B" Seams in the Sanborn Creek Mine will <br />probably result in sufficient subsidence induced tensile strain in <br />the interburden between the overlying, abandoned and the probably <br />flooded Oliver No. 1 Mine "D" Seam workings to progressively <br />release impounded water into the Sanborn Creek Mine. The large <br />volume of water probably impounded in the Oliver No. 1 Mine should, <br />therefore, be drained prior to high-extraction retreat mining of <br />underlying panels in the Sanborn Creek Mine. <br />Advance mining in the Sanborn Creek Mine should not breach the <br />approximately 340 feet of interburden between the overlying, <br />abandoned "E" Seam workings in the Hawk's Nest East Portal and West <br />Portal Mines and the Sanborn Creek Mine "C" and "B" Seam workings. <br />A collapse chimney of such a height would be unprecedented. It <br />should also be possible to drive mains, sub-mains and to achieve 50 <br />percent room and pillar panel extraction in those parts the "C" and <br />"B" Seams in the Sanborn Creek Mine overlain by the Hawk's Nest <br />East Portal and West Portal Mines "E" Seam workings without <br />drainage of any of the water that may be impounded in either of <br />these overlying mines. Planned pillar robbing during panel retreat <br />in the ^C" and "B" Seams in the Sanborn Creek Mine will subside <br />overlying portions of the abandoned Hawk's Nest East Portal and <br />West Portal Mine "E" Seam workings. However, as mining proceeds <br />the subsidence enhanced vertical permeability will probably <br />progressively release increasing quantities of water from any mine <br />pool that may presently be impounded in the overlying mine. <br />Prudence dictates determination of the presence and the head of <br />water impounded in the Hawk's Nest Mines. If water is found to be <br />impounded in Hawk's Nest Mine workings it should be drained before <br />robbing panel pillars in the Sanborn Creek Mine. <br />Four exploratory NX, nominal 3-in. outside diameter, holes, <br />WSC DH 5, 6, 7 and 8, were apparently drilled downward from the <br />Hawk's Nest Mine "E" Seam workings through the "B" Seam. These <br />holes present a potential release path for any water that may be <br />impounded in the Hawk's Nest Mine into the planned Sanborn Creek <br />Mine workings. If water is found to be impounded in the Hawk's <br />