A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. Crushers may be used to reduce the size, or change the form, of waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials (as in rock ore), so that ... Throughout most of industrial history, the greater part of crushing and mining...
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On the eve of battle in April 1861, most of the mines, forges, and foundries in America ... by Federal strategists intent on bringing down the Confederate war machine. ... quickly to ensure a steady supply of niter for the new powder mills being built. ... Corps an independent agency and renamed it the Niter and Mining Bureau.
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Advance - Mining in the same direction, or order of sequence; first mining as ... Barrier pillars are solid blocks of coal left between two mines or sections of a mine to prevent ... Thus, as the machine boom moves, the bridge conveyor keeps it in constant ..... Haulage - The horizontal transport of ore, coal, supplies, and waste.
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