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Geological exploration on the subsurface, such as the search and analysis of mineral deposits, together with the geological research and evaluation on the suitability of subsurface regions for the development and operation of underground structures not related to miningì¹´ë“œ?�서 ?�리?�까지: ?�울??ë² íŒ…?�는 기본 ?�울??ë² íŒ…?ï