Regional volcanic strata are the source of placer gold and laterization process is the main stage of formation of placer gold.
区域火山岩地金的矿源,地表赤红壤化可能金形的主要段。
Regional volcanic strata are the source of placer gold and laterization process is the main stage of formation of placer gold.
区域火山岩地金的矿源,地表赤红壤化可能金形的主要段。
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