Room-and pillar mining method with small room and pillar.

小矿房、小矿柱的房柱法。

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The main technology to realize high production and high efficiency in abroad is fully mechanized long-wall mining for a single seam or room-and-pillar mining.

国外高产高效矿井建设是以单一煤层长壁和房柱式综合机械化为主要开采技术。

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The feasibility of the protective coal pillar mining in the artificial inclined steep drift in the thick (ultra thick) coal seam of a large slope is discussed.

论证了急倾斜厚(特厚)煤层伪斜上山保护煤柱回收的可行性。

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First National Bank of Keystone, once a pillar of its West Virginia mining community, was hailed throughout the 1990s as one of the best-performing banks in the nation.

FORBES: Is Your Bank At Risk Of Failure?