Laserfiche WebLink
INTRODUCTION <br /> As the national energy base shifts from oil to coal and oil shale, vast <br /> areas of the United States will be subjected to greater underground mining <br /> activity. Increased interest has therefore been generated in the extraction <br /> of thick and steeply dipping coal seams located mostly in rugged and remote <br /> areas of the West. <br /> Recent environmental legislation by both the Federal and state govern- <br /> ments has placed severe restrictions on mining impacts to the surface <br /> environment. One major constraint on the extraction of thick and steeply <br /> dipping seams by longwall techniques has therefore been a fear of the con- <br /> sequences of the associated surface subsidence. <br /> At the present timie, adequate methods for predicting the cnaracteristtcs <br /> of subsidence and the 4,mr,,act or" subsidence on the surface environment are not <br /> �rre l l developed for mining envi ronf enzs in tine Unite 1 S _es . _n Tany Eurc^Yan <br /> countries , notably the United Kingdo-in, the area of subsidence prediction has <br /> been developed on an empirical basis using extensive subsidence data bases <br /> collected over a long period of time. These empirical capabilities are rou- <br /> tinely utilized by mine planners to minimize the surface impacts of under- <br /> ground mining. <br /> Under the Nation's energy program, studies of mining conditions and <br /> associ=_.: d s :�tiic'ence ch:.ra_erlstic5 in the U.S. coal fields are being ini- <br /> tiaL. In c0nt`,inJing tills ofi0+ , t; De' :r 0f y ina5 <br /> Request for Proposal (RFP) No. DE-RP22-30PC2O113, "Characterize :ion of Subs <br /> dence Over Multiple Lift Lon-.,aal 1 Pan`i s" . <br />