hardrock

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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
hardrock (ˈhɑːdˌrɒk)
 
adj
1.  (of mining) concerned with extracting minerals other than coal, usually from solid rock
 
n
2.  slang a tough uncompromising man

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