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room-and-pillar

[room-uh n-pil-er, roo m-] /ˈrum ənˈpɪl ər, ˈrʊm-/
adjective, Mining.
1.
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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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6
7
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