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wall rock

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wall rock

–noun Mining.
the rock forming the walls of a vein.

Origin:
1855–60, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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wall rock  
n.  The rock that forms the walls of a vein or lode.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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