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cone ball mill in norway

Ball mill realsmart glossary of mining terms rocksandmineralsmbutment in coal mining, 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 of strata spanning the roadway and the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back

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