underground mining

production of underground cavities in the mountains in a closed construction

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

ক্যাটাগরি:

mineral extractionmining