Colombia's Invisible Mines

Illegal mining has long been a bane for Colombia's society, economy and environment. Illegal artesanal miners use poisonous materials such as cyanide and mercury but don't have the knowledge or resources to safely dispose of them. But illegal mining has become a growing source of income for illegal groups. In 2012, Colombia exported almost $2 million dollars worth of tungsten to a single company in the United States which manufactures wire and other industrial supplies, according to Bloomberg news. After Bloomberg inquired, the buyer said it would stop purchasing Colombian tungsten.
http://mikesbogotablog.blogspot.com/2013/08/colombias-invisible-mines.html