placer mining wikipedia - EAS
- The name is from the Spanish word placer, meaning " alluvial sand". Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, aeolian placers and paleo-placers.en.wikipedia.org/wiki/Placer_deposit
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Placer mining - Wikipedia
Placer mining /ˈplæsər/ is the mining of stream bed (alluvial) deposits for minerals. This may be done by open-pit (also called open-cast mining) or by various surface excavating equipment or tunneling equipment. Placer mining is frequently used for precious metal deposits (particularly gold) and
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Xem thêmThe word placer derives from the Spanish placer, meaning shoal or alluvial/sand deposit, from plassa (place) from Medieval Latinplacea (place) the origin word for "place" and "plaza" in English. The word in Spanish is thus derived
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Xem thêmPlacers supplied most of the gold for a large part of the ancient world. Hydraulic mining methods such as hushingwere used widely by the Romans across their empire, but especially in
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Xem thêmAn area well protected from the flow of water is a great location to find gold. Gold is very dense and is often found in a stream bed. Many different gold deposits are dealt with in different
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Xem thêm• The Witwatersrand Basin in South Africa is an example of a placer deposit, as it is a 3 billion-year-old, alluvial sedimentary basin containing at least 70 ore minerals.
• The Klondike Gold Rushbegan in 1896 when nuggets of gold were found in the Klondike region of Alaska and the...
Xem thêm• Gold in California
• Gold mining in Alaska
• British Columbia gold rushes
• Gold prospecting...
Xem thêmAlthough this procedure is not required, the process water may be continuously recycled and the ore from which the sought-after minerals have been extracted ("the tailings") can be reclaimed. While these recycling and reclamation processes are more common in
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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". Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush. Type…
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