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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 materials ...
"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.
The word placer derives from the Spanish placer, meaning shoal or alluvial/sand deposit, from plassa (place) from Medieval Latin placea (place) the origin word for "place" and "plaza" in English. [4] The word in Spanish is thus derived from placea and refers directly to an alluvial or glacial deposit of sand or gravel.
In April 1860, one of the richest discoveries of placer gold in Colorado was discovered at California Gulch. [2] By 1872, placer mining in California Gulch yielded more than $2,500,000, roughly equivalent to $47,674,478 today. [3] In 1876, piles of sand once considered bothersome to placer gold miners, were discovered to contain lead carbonates ...
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.
Nome's gold fields, appearing untouched from the surface, are honeycombed with tunnels left by the gold rush drift miners. Today's miners, prospecting with modern drilling equipment, sometimes hit old drifts; this was, and is, a technique copied from the Welsh coal miners of south Wales and is much more effective than using bell pits .
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Prospectors found placer gold in 1870 in the Wrightman Fork of the Alamosa River. Gold veins were discovered in 1871, and large-scale production started in 1875 after the construction of a mill. By 1880, the Little Annie vein helped make Summitville Colorado's largest gold producer. Over 100,000 ounces of gold were produced by 1890.