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Production  of gold

Extracting the gold economically can be obtained from ore marks as low as 0.5g/1000kg on standard in large deposits easily extracted. Standard ore grades in opencast mines are 1-5 g/1000 kg (1-5 ppm), in the ore marks in below or solid rock quarries are normally at least 3 g/1000 kg (3 ppm), on standard. While ore marks of 30 g/1000 kg (30 ppm) are generally needed before gold is obvious to the naked eye in most of the gold mines the gold is invisible.

Since the 1880s, South Africa has been the resource of much of the supply of gold in the world, with about 50% of all the gold ever produced from South Africa. Production in 1970 accounted for 79% of world supply, generating about 1,000 tons. However, in 2005, production was only 294 tons according to the British Geological Survey. This sharp refuse is due to the rising problems of the mining and varying economic aspects upsetting the industry in South Africa.

The city of Johannesburg in South Africa was establish in response to the gold rush of Witwatersrand, which led to the invention of some of the huge deposits of gold, the world had ever seen. Gold Fields situated within the basin in the Free State and Gauteng region are extended in the strike and dip need some of the world’s deepest mines, and with the Savuka TauTona mines are at present the world’s deepest the gold mine 3,777 m. The Second Boer War of 1899-1901 between the British Empire and the Afrikaner Boer has been at least partially on the rights of miners and ownership of the gold mine in South Africa.

Other main producers are the United States, Russia, Australia, Peru and China. Mines in South Dakota and Nevada supply two thirds of the gold used in the US. In South America, the controversial Pascua Lama project aims to utilize the richest areas in the high mountains of the Atacama Desert, on the boundary between Chile and Argentina. Today, about one-quarter of world production of gold is expected to come from small-scale mining and artisanal.

Other process of testing and refining small amounts of gold include separation and inquartation and cupellation or refine methods based on the closure of gold in aqua regia. The world’s ocean has a large quantity of gold, but in very low absorption (1-2 perhaps 10 parts per billion). Many people have obtained to be inexpensively able to grasp gold from sea water, but so far they have all been either confused or criminal. Reverend Prescott Jernegan manages gold from seaside trick in 1890s in America. A British cheat proceed the similar trick in England in the beginning 1900s.

Fritz Haber challenged commercial mining of gold from sea water in an attempt to help pay Germany’s damages after the First World War. Unluckily, his estimation of the absorption of gold from seawater was too high, mostly because of sample contamination. The attempt produces little gold and the price of the German government, much more than the trade value of the gold gained.

Business workable mechanism to execute the mining of gold from seawater has not been found. But the synthesis is not inexpensively workable and it is unlikely to become so in the predictable future. The normal gold extraction and mining costs are $ 238 per troy ounces, but it will differ broadly according to the type and ore quality. In 2001, world mine manufacture amounted to 2,604 tones, or 67% of total require for gold this year. By the end of 2001, it was expected that all the gold ever extracted totaled 145,000 tons.