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i <br />• Subsidence Report • <br />Year End, 1989 <br />Background: Previously, the Foidel Creek has utilized room and pillar <br />mining methods, and the subsidence resulting from this type of mining has <br />been documented and submitted to the Colorado Mined Land Reclamation <br />Division, Presently, longwall mining techniques are utilized at the mine, <br />and this report presents the first set of subsidence data from tl~e area that <br />has been undermined by the longwall. <br />Current Data: Tlie longwall was put into service on September 26, 1989, <br />and through the period of December 31, 1989 advanced approximately 1350 <br />feet. The survey data from the subsidence monuments overlying this mined <br />out area indicate that approximately 3.2' of subsidence has occurred. The <br />monuments detecting this degree of subsidence are located over the <br />centerline of the panel. Throughout the subsidence monitoring network the <br />amount of measured subsidence ranged form 0.1 to 3.2 feet. The data is <br />presented on the attached table and visually represented on the attached <br />cross section. <br />Conclusions: As planned, subsidence is occurring over the first longwall <br />panel. Given the isolated location of the mining, no structures leave been <br />impacted by subsidence, nor has material damage occurred in the area. As <br />mining progresses up the hill an old farmstead will be subsided. <br />