Miners in lawless backlands use liquid mercury to separate gold from river sediments, giving Antioquia one of the highest levels of mercury pollution anywhere, according to United Nations researche
http://www.nytimes.com/slideshow/2011/03/04/world/americas/colombia-gold-rush.html
Congo slide show
http://www.nytimes.com/slideshow/2009/02/23/world/20090223CONGO_index.html?ref=gold
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