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Underground Ore Crushing

1218 leadbearing ore crushing and grinding 12181 general1 leadbearing ore is mined from underground or open pit min after extraction, the ore is processed by crushing, screening, and milling domestic lead mine production for 1991 totaled 480,000 megagrams mg 530,000 tons of lead in ore concentrates, a decrease of some 15,000 mg 16,500 tons.

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