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矿源,地表赤红壤化可能是砂金形成
。
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矿源,地表赤红壤化可能是砂金形成
。
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