When people think of gold mining, they may likely remember quaint images
of people panning for gold sediment by a flowing river, similar to what
American settlers did in California during the mid-19th century. Gold
mining methods have advanced considerably since then, and even in
smaller operations that cannot afford large machinery, amateurs have
turned to cheap chemical compounds to help them isolate gold from other
minerals. These methods, known as artisanal gold mining, can pose
dangers to both miners and the environment, depending on what chemical
compounds are used. Among the most common substances is mercury.
http://www.greyhoundchrom.com/blog/310-why-is-artisanal-gold-mining-dangerous.aspx
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