underground mining

production of underground cavities in the mountains in a closed construction

en-GB/ˈʌndəɡɹaʊnd ˈmaɪnɪŋ/
en-US/ˌʌndɚˈɡɹæʊnd ˈmaɪnɪŋ/

หมวดหมู่:

mineral extractionmining