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A Study of Coal Availability in the Hackett 7.5-minute Quadrangle, Washington County, Pennsylvania

出版	Pennsylvania Geological Survey, 2005
URL	http://books.google.com.hk/books?id=0GV9tAEACAAJ&hl=&source=gbs_api

註釋The Hackett 7.5-minute quadrangle in southwestern Pennsylvania is underlain by upper Carboniferous and lower Permian rocks, which contain the Pittsburgh, Redstone, Waynesburg, and Waynesburg A coal beds. Extensive mining of these coals, particularly the Pittsburgh, during the last half century has removed nearly half of the original coal. The Hackett quadrangle is one of four initial quadrangles in the bituminous coal fields of Pennsylvania selected in 1993 to demonstrate how much coal on average remains available for extraction within a mature mining district. Results from this first study indicate that of the approximately 607 million short tons of bituminous coal originally in the Hackett quadrangle, 272 million short tons, or 45 percent, has been mined out. An additional 83 million short tons, or 14 percent, of coal can be excluded due to resource restrictions, such as land-use and technological factors, leaving only about 252 million short tons, or 42 percent, of the original amount of coal available for mining.