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Placer mining (/ ˈ p l æ s ər / or / ˈ p l eɪ s ər /) is the mining of stream bed deposits for minerals. This may be done by open-pit (also called open-cast ...

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Placer mining: Placer mining, ancient method of using water to excavate, transport, concentrate, and recover heavy minerals from alluvial or placer deposits. Examples ...