Regional volcanic strata are the source of placer gold and laterization process is the main stage of formation of placer gold.
区域火山岩层是砂金的矿,赤红壤化可能是砂金形成的主要段。
Regional volcanic strata are the source of placer gold and laterization process is the main stage of formation of placer gold.
区域火山岩层是砂金的矿,赤红壤化可能是砂金形成的主要段。
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