hard rock

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hard rock

[′härd ¦räk]
(geology)
Rock which needs drilling and blasting for removal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

hard rock

Rock, which is found during excavation, that can be removed only by pneumatic tools or explosives.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.