Search results
Results from the WOW.Com Content Network
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.
A miner using a hydraulic jet to mine for gold in California, from The Century Magazine January 1883. Hydraulic mining is a form of mining that uses high-pressure jets of water to dislodge rock material or move sediment. [1] In the placer mining of gold or tin, the resulting water-sediment slurry is directed through sluice boxes to
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 ...
In the most complex placer mining, groups of prospectors would divert the water from an entire river into a sluice alongside the river and then dig for gold in the newly exposed river bottom. [98] Modern estimates are that as much as 12 million ounces [99] (370 t) of gold were removed in the first five years of the Gold Rush. [100]
Secret Ravine is a perennial tributary of Miners Ravine which shortly thereafter runs into Dry Creek in Placer County, California. Its course lies within the cities of Rocklin, Loomis, and Roseville, as well as unincorporated parts of Placer County. It passes through the campus of Sierra College.
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. [2] Placer materials must be both dense and resistant to weathering processes. To ...
Ophir was a boomtown of the California Gold Rush. Originally named The Spanish Corral in 1849, [4] Ophir received its Biblical name Ophir, the source of King Solomon's treasures, in 1850 because of the rich gold placer mining in the area. [2] In 1852 it was the center of the local gold mining industry, and the most populous town in the county.
Gold Dredge, Klondike River, Canada, 1915 The Yankee Fork dredge near Bonanza City, Idaho, which operated into the 1950s. A gold dredge is a placer mining machine that extracts gold from sand, gravel, and dirt using water and mechanical methods.