pillar extraction
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pillar extraction
(′pil·ər ik′strak·shən)
(mining engineering) Removal of the pillars of coal left over from mining by the pillar-and-stall method. Also known as pillar mining.
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McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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