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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. [2]
Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are often found in alluvial deposits—deposits of sand and gravel in modern or ancient stream beds, or occasionally glacial deposits. The metal or gemstones, having been moved by stream flow from an original source such as a vein, are ...
Sedimentary placer deposits are known as 'leads' or 'deep leads'. Placer deposits are often worked by fossicking, and panning for gold is a popular pastime. Laterite gold deposits are formed from pre-existing gold deposits (including some placer deposits) during prolonged weathering of the bedrock. Gold is deposited within iron oxides in the ...
The California gold rush (1848–1855) was a period of American history in which the most amount of gold seen at the time was discovered. The initial discovery of gold in America in 1848 attracted many immigrants who were intent on the opportunity and potential wealth that came with gold mining.
Deeper placer deposits may be sampled by trenching or drilling. [2] Geophysical methods such as seismic, gravity or magnetics may be used to locate buried river channels that are likely locations for placer gold. [3] Sampling and assaying a placer gold deposit to determine its economic viability is subject to many pitfalls. [4]
Placer mining is a method of extracting gold from alluvial deposits such as sand, gravel, and sediment. [42] [43] These are known as placer deposits which are typically found in riverbeds, stream beds, and floodplains. [44] These deposits typically contain minerals that are resistant to weathering and eroision like gold, platinum, diamonds, and ...
Newly discovered deposits like Confederate Gulch attracted young footloose men, motivated by a desire to get rich quickly. [9] Towns that sprang up at placer gold strikes were jerry built, ephemeral and hectic places and Diamond City and the other Confederate Gulch communities were no exception. [9] As long as gold was produced they boomed along.
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. [15] Modern estimates by the U.S. Geological Survey are that some 12 million ounces [ 16 ] (370 t ) of gold were removed in the first five years of the ...
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