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SURFACE SUBSIDENCE OVER A ROOM -AND -PILLAR MINE <br />IN THE WESTERN UNITED STATES <br />By Jeff A. Magerst <br />ABSTRACT <br />'flus report summarizes the results from the subsidence research study completed by the U.S. Bureau <br />of Mines at the Roadside Mine, Powderhorn Coal Co., Palisade, CO. This research was conducted from <br />February 1981 to August 1485, with additional data obtained during July 1991, to evaluate residual sub- <br />sidence. The Bureau studied subsidence at three distinct room -and -pillar sections at separate locations <br />over the mine and determined the maximum subsidence values and surface subsidence profiles for each <br />mining section. Maximum subsidence of 3.0 ft occurred over the room -and -pillar sections, with over- <br />burden depths ranging from 50 to 600 ft. Surface tension cracks had occurred, and were still evident <br />during the residual subsidence survey, <br />tMatensh capncer. U S. BA reau of !Mines, Demur Research Center, Denver, CO. <br />