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Underground mining (soft rock)

mining techniques used to extract minerals/materials from sedimentary rock

Pronunciation
/ˈəndərˌɡraʊnd ˈmaɪnɪŋ ( sɔft rɑk )/
/ʌndəˈɡraʊnd ˈmʌɪnɪŋ ( sɒft rɒk )/