... stream placer 河床砂矿 placer platinum 砂铂 iron placer 砂铁矿 ...
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placer iron 砂铁
placer r iron 砂铁
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A key to ore dressing of quartz sands includes rude ores of high or low quality, occurrence and distribution of detrimental impurity such as iron and aluminium in size grades of placer deposits.
石英砂原矿质量的优劣，有害杂质铁、铝的赋存状态及其在各粒级砂矿中的分布，是决定选矿效果的关键。
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