room-and-pillar

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room-and-pillar

[room-uhn-pil-er, room-]
adjective Mining.
noting a means of extracting coal or other minerals from underground deposits by first cutting out rooms, then robbing the pillars between them; pillar-and-breast.
Compare longwall.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Retreat room-and-pillar mining layout, showing the panel on the left side in the process of being extracted.
The mine utilized the modified room-and-pillar sublevel stoping mining method.
Coal pillars are employed in a wide variety of mining operations, from shallow room-and-pillar mines to deep longwall mines.
The shuttle car was loaded with coal and operated in a manner similar to a room-and-pillar scenario.
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