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    Glossary of Mining Terms Coal Education

    A. Abutment In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch

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    To handle wet coal, coal jigs were used. Coal jigs separated coal from impurities by using gravity. Since the relative density of uniformly sized pieces of coal

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    Coal of all types can vary widely in the amount of sulfur contained. These differences are determined by the conditions under which the coal formed.

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