Tonglusha copper mine is a large mine with underground and surface combined mining system.
铜录山铜矿是露天与地下联合开采的大型铜矿。
The combined oPen pit and underground mining system has found wide application in depeit mining.
矿床开采中露天与地下的联合开采法得到了广泛的应用。
The combined oPen pit and underground mining system has found wide application in depeit mining.
矿床开采中露天与地下的联合开采法得到了广泛的应用。
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