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Coal Mining Steel Ball Crushing

Coal Mining Steel Ball Crushing Coal Mining Steel Ball Crushing Glossary of Mining Terms MineralAbutment 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 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.

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