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The Salem MC MulT: This machine sits low, recovers thin seam coal that other machines can''t and can convert over to drill thicker seams too.
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In this month''s Spotlight Feature Article, from the pages of the June 2012 issues of International Mining, Editor Paul Moore reports that Underground Drilling ...
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 ...
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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 ...
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