Artisanal small-scale gold mining is the second largest source of emissions. There are nearly seventy countries that practice mining. These unregulated operations contain between ten and fifteen million miners in the world. Individuals obtain a muddy sample and add mercury. This allows for the binding of the molecule to gold particles, resulting in a compound known as amalgram. Finally, it is boiled or burned which allows for the extraction of gold.
http://auenvironmentalscience.blogspot.com/2014/04/mercury-pollution-and-poisoning.html
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