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Types Of Coal Mining

coal types, formation and methods of mining,coal types, formation and methods of mining. legend: cambrian, ordovician, silurian, devonian, mississippian, pennsylvanian, permian, triassic, jurassic, cretaceous, tertiary, quaternary. world wide contemporary coal reserves by continent. coal is an organic sediment consisting of a complex mixture of substances..coal mining and transportation,mining coal . coal miners use large machines to remove coal from the earth. many u.s. coal deposits, called coal beds or seams, are near the earth's surface, while others are deep underground.modern mining methods allow coal miners to easily reach most of the nation's coal reserves and to produce about three times more coal in one hour than in 1978..

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