To date, around 244, 000 metric tons of gold have been discovered (187, 000 metric tons historically produced plus current underground reserves of 57, 000 metric tons). Gold is found primarily as a pure native metal. Silvanite and calaverite are minerals that contain gold. Gold is usually found embedded in quartz or gravel veins in streams of pleasure.
It is mined in South Africa, USA. UU. (Nevada, Alaska), Russia, Australia and Canada. Gold is most commonly found in quartz rock.
When quartz is found in areas where gold is produced, gold may also be found. Quartz can be found as small stones in riverbeds or in large veins on the slopes of hills. The white color of quartz makes it easy to detect in many environments. This gold rush is immortalized in Jack London's novels and in Charlie Chaplin's film The Gold Rush.
The gold-filled granules are removed and gold is extracted from them by washing them in a hot cyanide solution. Yellow, green and red golds are produced by alloying gold with copper and silver in different proportions. The gold contained in these rocks has been dragged into streams to form alluvial (pleasure) gold deposits. Reportedly, gold mining in Arizona began in 1774, when the Spanish priest Manuel López ordered the Papago Indians to wash gold from gravel on the slopes of the Quijotoa mountains in Pima County.
The solution filters through the ore, leaches the gold as it progresses and is extracted at the base before being treated to recover the gold. In many of these places, there may be a large reserve of low-quality placer gold, but the lack of a permanent supply of water for conventional placer-mining operations requires the use of expensive dry or semi-dry concentration methods to recover gold. In addition, study the gold mineralization process in general to determine which segment of a particular area can produce gold. Gold mining continued there until 1849, when the California gold rush attracted Mexican miners.
North Carolina was the scene of the first gold rush in the United States, following the discovery of a 17-pound (7.7 kg) gold nugget by 12-year-old Conrad Reed in a stream on his father's farm in 1799.It is then poured into molds where it cools and hardens in the form of gold ingots called “ingots”, making it easier to stack and transport gold. The Haile deposit was discovered in Lancaster County in 1827, and between then and 1942, at least 257,000 troy ounces (8,000 kg) of gold were extracted intermittently, when the gold mine was ordered closed because it was not essential to the war effort. In refractory ore, gold is trapped in sulfur minerals, so achieving satisfactory levels of gold recovery requires additional processing prior to cyanidation. Some of the world's leading mining companies, such as Newmont Mining, Barrick Gold and Kinross Gold, operate gold mines in the state.
Gold was discovered in 1858 during the Pike's Peak gold rush near present-day Denver in 1858, but the deposits were small. Many cities have developed thanks to the wealth of gold mining, and Australia also has many “ghost towns”: when the supply of gold ran out, people simply left the area.