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Mining of stream bed deposits for minerals
- Placer mining (/ ˈplæsər /) is the mining of stream bed deposits for minerals. This may be done by open-pit mining or by various surface excavating equipment or tunneling equipment.
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Placer mining (/ ˈ p l æ s ər /) is the mining of stream bed deposits for minerals. This may be done by open-pit mining or by various surface excavating equipment or tunneling equipment.
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Placer mining is an ancient technique of extracting heavy minerals from alluvial deposits using water. Learn about the history, processes, and equipment of placer mining, and see how it differs from strip mining.
Apr 14, 2015 · Learn how placer miners separated gold from sand or gravel using simple tools, water, and machines in Alaska and the Klondike. See the remains of placer mining operations along the Yukon River and the legacy of the gold rush.
Learn about the sources, formation, and distribution of placer gold in the United States, especially in California, Alaska, Montana, and Idaho. This report by USGS provides detailed geological and historical information on placer mining and gold production.
- 10.3133/b1857G
- Gold in placer deposits
- 1989
Jun 11, 2024 · These are minerals of high specific gravity and physical toughness. Although there are several different types of placer deposits, the two most economically important are stream and beach placers. Stream (or alluvial) placers are formed by running water, while beach placers are formed by the action.
In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. The name is from the Spanish word placer, meaning "alluvial sand".
Learn what placer gold is, how it forms, and how to mine it. Find out the difference between residual, eluvial and alluvial placers, and where to look for them in rivers and deserts.
