While the scale of deforestation is far lower than that caused by agriculture, livestock and illegal logging, the authors say gold mining has worse side-effects because miners use cyanide, mercury and arsenic, which contaminates water sources over a wider area and slows the regrowth of vegetation.
http://www.theguardian.com/environment/2015/jan/14/high-gold-prices-causing-increased-deforestation-in-south-america-study-finds
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