单词	longwall
释义	longwall /ˈlɒŋwɔːl / adjective Mining Of or involving a single long face worked (usually mechanically) along its whole length: longwall mining... In 1976, Old Ben Coal Co., with Federal assistance, began a trial of modern mechanized longwall mining in a new area of their No.24 mine in the Herrin Coal seam. The three main underground mining methods are stoping, room-and-pillar mining, and longwall mining. A single longwall path can stretch for two miles, causing everything on the surface directly above it to collapse.
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