operation of coal crusher
coal crushingmilloperation- vijaytradingcompany.in. A. Abutment - Incoalmining, (1) the weight of the rocks above a narrow roadway is transferred to the solidcoalalong the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solidcoalahead of the face and the ...
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