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Uni ted Kingdom Coal Mines (Harlech 1925) . With the advent of mechanised longwall mining was gradual Iy mining , selective discontinued and most of the colliery dirt was loaded with Run of Mine (ROM) coal. The tradi tional gateside packs in longwall advance nining have now been replaced by various mechanised and monoli thic packing systems.
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MECHANISATION OF UNDERGROUND COAL MINING METHOD. WAGE COMPONENT IN TOTAL COST. NCL EMS in Rs OMS Wage Cost in Rs/T Cost of Production Rs/T Sale Value. Rs/T Wage Cost / Cost of Production % Wage Cost / Sale of Coal %
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