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the mining operation because of unforseen or changing conditions <br /> that would otherwise prevent the mines from meeting their shipment <br /> requirements . <br /> 2 . Production methods and equipment <br /> a . Specific type and method of mining procedures <br /> The total coal production from Coal Basin is by <br /> underground mining methods . The two basic mining methods utilized <br /> are room and pillar and longwall . All of the five mines have <br /> been classified as drift mines because the mines were opened on <br /> or near the outcrop and then developed within the coal seams . <br /> Because of the dip of the coal seams and the general topography <br /> of the area, the cover above the coal seams increases very rapidly, <br /> thereby limiting the amount of shallow or low cover coal to a <br /> relatively narrow band along the outcrop. Virtually all of the <br /> shallow cover reserves (up to 1, 000 ft. ) have been mined . In <br /> terms of cover (overburden) the present coal producing faces are <br /> among the deepest, if not the deepest, in the western hemisphere. <br /> Production in Coal Basin is from two minable coal <br /> seams which are the Dutch Creek Seam or Middle Bed and the Coal <br /> Basin Seam or B Bed . Four of the five mines produce coal from <br /> the B Bed or Coal Basin Seam. They are the Dutch Creek #1 Mine, <br /> the L. S . Wood 03) Mine, Bear Creek (#4) Mine, and the Coal <br /> Basin (#5) Mine. The single mine producing coal from the Middle <br /> Bed or Dutch Creek Seam is the Dutch Creek #2 Mine. <br /> b . Detailed engineering techniques <br /> �3 <br />