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Longwall face
In mining, a long exposed underground rock face from which minerals are extracted. Depending on the geological conditions and the system adopted for development of the deposit, the longwall face may measure 25-350 m or more.
Cutting, loading and transportation of coal from longwall faces was mechanised at 85% of Soviet mines in 1971.
The term was originally used at mines in the Donbass region; in literature, it first appeared in A I Kuprin's story "In the Depths of the Earth" (1899).
