| 释义 |
Definition of longwall in English: longwalladjectiveˈlɒŋwɔːl Mining Of or involving a single long face worked (usually mechanically) along its whole length. Example sentencesExamples - In lucid terms, Booth first elaborates the mechanisms and impacts of the hydrogeological response to 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.
- A single longwall path can stretch for two miles, causing everything on the surface directly above it to collapse.
- The three main underground mining methods are stoping, room-and-pillar mining, and longwall mining.
- Between 1983 and 1998, as Pennsylvania replaced most traditional underground mining with longwall mining, the state's coal production increased by 64% while the number of coal miners fell by 81%.
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