Longwall



[lawng-wawl, long-] /ˈlɔŋˌwɔl, ˈlɒŋ-/

adjective, Mining.
1.
noting or pertaining to a means of extracting coal or other minerals in an underground mine from a continuous face, the roof before the face being supported at intervals by temporary or movable artificial supports.
Compare .
noun
2.
the continuous face so worked.

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