by-product silver 中文意思是什麼
by-product silver
解釋
副產銀-
Gold reserve in china is characterized by wide and relatively concentrated distribution, large number of medium - small deposits and small number of large - superlarge deposits, slightly lower grade, big proportion of the micro disseminated deposits, large volume and important value of by - product gold and close association of gold and silver
我國金礦的基本特點是:分佈廣、較集中;中小型礦床多,大型超大型礦床少;金礦品位偏低;微細浸染型金礦比例較大;伴生金礦儲量大,且具重要價值;金銀密切共生。
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