longwall

[lawng-wawl, long-]
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 room-and-pillar.
noun
2.
the continuous face so worked.

Origin:
1830–40; long1 + wall

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Longwall development is strikingly similar to the development for
  room-and-pillar mining.
Contributions during mining from major longwall dust sources thus increased the
  potential dust exposure from this source.
Eighty-eight percent of our coal is produced using the longwall method of
  mining.
The longwall coordinator and general mine foreman are responsible for longwall
  moves.
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