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The resulting gold is 99.5% pure, but of lower purity than gold produced by the other common refining method, the Wohlwill process, which produces gold of up to 99.999% purity. [1] [2] The Wohlwill process is commonly used for producing high-purity gold, such as in electronics work, where exacting standards of purity are required.
As of 1919, the Bank of England would receive consignments of raw gold from the producers and issue it to individual refineries, refined and then returned to the Bank for sale, and the hope was that after the Rand Refinery was built, the gold industry would still be financed in London and that the refined gold would be sold in the latter.
The Wohlwill process is an industrial-scale chemical procedure used to refine gold to the highest degree of purity (99.999%). [1] The process was invented in 1874 by Emil Wohlwill . This electrochemical process involves using a cast gold ingot , often called a doré bar , of 95%+ gold to serve as an anode .
This list of gold mines in Canada is subsidiary to the list of mines article and lists working, defunct and future mines in the country. For practical purposes, defunct and future mines are demarcated in italics and bold respectively. Asterisks (*) note mines which produce(d) gold as a secondary product..
Canada is the 4th largest producer of gold in the world, only behind China, Australia, and Russia. [7] 2.2% of the world's total gold reserves belong to Canada. [2] Canada mainly trades gold with the United Kingdom. In 2021, 47% of exported Canadian gold went to the United Kingdom. [2]
The gold may then be further refined by gold parting, which removes other metals (principally silver) by blowing chlorine gas through the molten metal. Historically, small particles of gold were amalgamated with mercury, and then concentrated by boiling away the mercury. The mercury method is still used in some small operations.