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Underground hard rock mining
underground mining techniques used to excavate hard minerals
Pronunciation
/ˈəndərˌɡraʊnd hɑrd rɑk ˈmaɪnɪŋ/
/ʌndəˈɡraʊnd hɑːd rɒk ˈmʌɪnɪŋ/
Categories
mining technology
underground mining