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Placer mining (/ ˈ p l æ s ər /) [1] is the mining of stream bed deposits for minerals. [2] This may be done by open-pit mining or by various surface excavating equipment or tunneling equipment.
Gold miners excavate an eroded bluff with jets of water at a placer mine in Dutch Flat, California sometime between 1857 and 1870.. The modern form of hydraulic mining, using jets of water directed under very high pressure through hoses and nozzles at gold-bearing upland paleogravels, was first used by Edward Matteson near Nevada City, California in 1853 during the California Gold Rush. [3]
Auburn is a city in and the county seat of Placer County, California, United States. [9] Its population was 13,776 during the 2020 census. Auburn is known for its California Gold Rush history and is registered as a California Historical Landmark. [10] Auburn is part of the Sacramento metropolitan area.
Charles Scott Haley (November 8, 1884 – 1958) was an American a mining engineer. He was an expert in the field of placer gold deposits. [1] His 1923 work, Gold placers of California (California State Mining Bureau Bulletin 92, 1923) described all economic occurrences of alluvial gold deposits in California that were known at the time.
But the placer deposits worked in the early years were quickly exhausted, and production crashed. Hardrock mining (in California called quartz mining) began in 1849, and placer mining by hydraulic mining began in 1852. Despite the new mining methods, by 1865 production was 867,000 troy ounces (27,000 kg), less than one-quarter of peak production.
Because the gold in the California gravel beds was so richly concentrated, the early forty-niners simply panned for gold in California's rivers and streams, a form of placer mining. [ 10 ] [ 11 ] However, panning cannot take place on a large scale, and industrious miners and groups of miners graduated to placer mining " cradles " and "rockers ...
Located on the north bank of the Calaveras River, Jenny Lind was a placer mining town as early as 1849. Most of the placer mining was done along the hillsides above the river; later the river was mined with dredgers. In 1864 the population was said to be 400, half of them Chinese.
The discovery of placer gold in La Panza Canyon in 1878 began a small gold rush and La Panza grew into a gold mining boomtown. It had its own post office from November 4, 1879, to June 15, 1908. It had its own post office from November 4, 1879, to June 15, 1908.