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