Hard rock mining

[hahrd-rok] /ˈhɑrdˌrɒk/

(loosely) of or relating to igneous or metamorphic rocks, as in mining (hard-rock mining) and geology (hard-rock geology)


Severe; dour and pugnacious; tough: the old hard-rock guy who would line up all the cocaine users and shoot them

[1923+; probably fr the difficulty of hard-rock mining as distinct fr other kinds; influenced by rock-hard]


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