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has been less extensively mined than the lower B Bed and consequently <br /> a greater portion of the minable reserves are in place. Most of <br /> the coal reserve in the Middle Bed lies at depths in excess of <br /> 1500 feet of cover . <br /> d . Major Equipment to be used . <br /> Major equipment utilized by Mid-Continent in its <br /> Coal Basin mining operations is as follows : <br /> Continuous Miners Underground Supply <br /> Longwall Equipment Vehicles <br /> Loading Machines Ventilation Fans <br /> Shuttle Cars Hoists <br /> Feeder Breakers Off -Highway Trucks <br /> Roof Bolters (until 1987) <br /> Rock Duster Bulk & Bulldosers <br /> Tank Road Graders <br /> Belt Conveyors Water Trucks <br /> Front-end Loaders Backhoes <br /> Pickups Highway Semi-Trucks <br /> e . Measures to Insure Maximum Resource Recovery <br /> Mid-Continent ' s underground operations in <br /> Coal Basin are designed to achieve maximum resource recovery <br /> consistent with safe, commercially viable operating practice. <br /> This is accomplished by utilizing more than one mining technique. <br /> Where depth of cover is less than about 1500 feet, room and <br /> pillar mining has demonstrated a high degree of flexibility - <br /> particularly when operating around faults and dikes . A special <br /> mining plan has been developed with MSHA to recover a portion of <br /> the bottom coal in areas where the overall seam height exceeds <br /> the operating height of the equipment . <br /> In 1976, Mid-Continent Resources installed the <br /> first advancing longwall system in the United States to improve <br /> t0 <br />