Placer mining: Oldest method of recovering gold from alluvial deposits.

砂矿开采: 从冲积层回收黄金的最古老方法.

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Dredging is the most important placer - mining method today.

挖掘法现在是最重要的砂矿开采的方法.

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This primitive form of placer mining is still used in some places for panning gold.

这种原始的砂矿开采形式至今还在一些地方用来淘金.

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