Recent years' geological exploration has confirmed that the proved copper reserves in Dabaoshan copper(silver) polymetallic ore field has reached middle scale.
云南维西大宝山铜（银）多金属矿区通过近年的地质勘查，探明的铜资源量已达中型规模。
Separation of copper, zinc and sulphur complex ore has been a difficult problem in the mineral processing field.
前言：铜锌硫多金属矿石分离一直是选矿界的难题。
Separation of copper, zinc and sulphur complex ore has been a difficult problem in the mineral processing field.
前言：铜锌硫多金属矿石分离一直是选矿界的难题。
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