... 选煤机 coal picker; coal separator; coal washer; concentrator; dirt extraction gear 再选煤 re-run coal 包姆选煤机 baume washer ...
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A scheme can be considered, i. e. a coal chute rise is re-driven along the edge of goaf in coal pillars, and the gates are run along the strike.
在上山煤柱中，可以考虑采用沿采空区边缘重新掘溜煤上山，沿走向布置回采巷道的方案。
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