The U.N. Industrial Development Organization said miners use 8-13 grams of mercury for every 10 grams of gold recovered. Nearly 95 percent of the mercury used by miners ends up in the atmosphere or in the soil that the miners discard during the process. This constitutes an estimated total of 1,000 tons of mercury a year by artisan miners worldwide. The extent of the problem is enormous: Artisan gold miners are responsible for 30 percent of the mercury pollution caused by man, the Blacksmith Institute, an organization working on the problem, said.
After it’s been vaporized, the mercury eventually falls to the ground. Rains wash the mercury into the watershed, where bacteria transform it into methyl mercury, one of the most toxic elements on Earth. Methyl mercury persists in the environment for decades, circulating between air, water, sediments and soil, eventually entering the food chain through contaminated fish, where it poisons animals and humans alike, Van Den Berghe said.
http://www.upi.com/Top_News/World-News/2012/09/20/In-rush-for-gold-miners-in-Senegal-ignore-mercury-poisoning/UPIU-2621331611731/
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