eluvial placer
... eluvial placer 残积矿床 ; 残积砂矿 semiautomatic placer 半自动放置器 placer tin 砂锡 ...
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残积砂矿床 eluvial placer deposit
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根据成因蓝宝石砂矿层分为冲积砂矿层、洪积砂矿层和残坡积砂矿层；洪积砂矿层中蓝宝石最富。
According to I ts origin, sapphire sand strata are divided into sand wash stratum, pluvial stratum and relict drifted sand stratum, while sapphire concentrated well in drifted sand stratum.
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