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Glossary of Mining Terms - rocksandminerals.com Back — The roof or upper part in any underground mining cavity. Backfill — Mine waste or rock used to support the roof after coal removal. Barren — Said of rock or vein material containing no minerals of value, and of strata without coal, or containing coal in seams too thin to be workable. Iron Sea Sand Selecting Machine mining magnetite separator machine - jcd-a.org . Jul 22, 2017· dry magnetic separator, iron mine selecting machine for ricer sand, magnetite,complete details about dry magnetic separator, iron mine selecting machine . Glossary of Mining Terms - Kentucky 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 .    Service Online

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