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Glossary of Mining Terms - Coal Education A. Abutment - 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 solid coal ahead of the face and the back . grinding grinder plants machine, barite crusher, mining . Hammer crusher designed by L Machine fits for producing 0-3MM coarse powder products. This machine adopts theories… Minerals | An Open Access Journal of Mining & Mineral . Minerals (ISSN 2075-163X; CODEN: MBSIBI) is an international, open access journal of natural mineral systems, mineral resources, mining, and mineral processing.    Service Online

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