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hardrock mining

 - 1 dictionary result

hard-rock

[hahrd-rok]
–adjective
(loosely) of or pertaining to igneous or metamorphic rocks, as in mining (hard-rock mining) and geology (hard-rock geology).


Origin:
1920–25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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