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"Panning out" ~ Stereoscopic view of print taken by the U.S. Geological and Geographic Survey of the Territories ~ circa 1874–1879 Gold panning is a simple process. Once a suitable placer deposit is located, some alluvial deposits are scooped into a pan, where they are then wetted and loosed from attached soils by soaking, fingering, and aggressive agitation in water.
Gold pans and shovels are commonly allowed, but sluice boxes and suction dredges may be prohibited in some areas. [12] [13] There are public mining areas in many states, and prospecting may allow one to stake a gold placer claim or other type of mining claim in certain areas. Some public lands have been set aside for recreational gold panning.
Russian explorers discovered placer gold in the Kenai River in 1848, but no gold was produced. Gold mining started in 1870 from placers southeast of Juneau. [7] Alaska produced a total of 40,300,000 troy ounces (1,250,000 kg) of gold from 1880 through the end of 2007.
Starting in the 1920s, water was brought to the area through the 90-mile (145 km) Davidson Ditch for gold mining. The Goldstream Dredge No. 8 cut a 4.5-mile (7.2 km) track and produced 7.5 million ounces of gold. [2] The dredge was named a Historic Mechanical Engineering Landmark by the American Society of Mechanical Engineers in 1986. [2]
Dredges were used in the Klondike River valley from 1910-1950. [8] A dredge could do the work of 2,400 [9] persons while operated by 10-12. [10] It would create a pool of water that moved along with it as it dug up gravel in front and deposited it behind itself. Inside sand and gold particles were separated from rocks and then gold from sand.
The Black Fork is a principal tributary of the Mohican River, 58.4 miles (94.0 km) long, [3] in north-central Ohio in the United States. Via the Mohican, Walhonding, Muskingum and Ohio Rivers, it is part of the watershed of the Mississippi River, draining an area of 351 square miles (910 km 2). [3]
The Cañada del Oro ultimately feeds into the Santa Cruz River just northwest of Tucson, the principal watershed channel in the Tucson valley. Historically, the Cañada del Oro was the focus of significant interest in gold mining, beginning with Spanish explorers in the 17th century.
Gold mining Dredge No. 4 ( Hän : Lëzrą Kä̀nëchà "s/he is looking for money" ) is a wooden-hulled bucketline sluice dredge that mined placer gold on the Yukon River from 1913 until 1959. It is now located along Bonanza Creek Road 13 kilometres (8.1 mi) south of the Klondike Highway [ 1 ] near Dawson City , Yukon , where it is preserved as ...