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22. photo 12. yuba-placer gold company's hammonton dredge . 25. photo 15. gold recovery system at the hansen brothers bear river plant .
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placer mining /ˈplæsər/ is the mining of stream bed deposits for minerals. this may be done by .. in january 1884, the north bloomfield mining and gravel company case banned the flushing of debris into streams, and the hydraulic mining
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