Because many of the illegal and small scale gold mining uses mercury without control causing grave environmental problems in the the Venezuelan Guayana. Mercury contamination has been a public health issue for 25 years, and over 92% of the Ye´kuana and Sanema women from the Caura River basin have mercury levels higher than the safe levels established by the WHO (and we all know what happened in Minamata).
http://caracaschronicles.com/2014/04/17/xxist-century-eco-socialism/
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