Government regulations enacted in the late 1980s to monitor artisanal mining have failed to keep pace with the growth of the market – witness the arrest and expulsion of thousands of illegal Chinese miners in 2013. Armed with crude excavators and pumps, the modern-day gold rushers left behind pockmarked forests, abandoned mines susceptible to collapse, and rivers contaminated by the mercury used to extract gold.
http://news.mst.edu/2017/02/learn-locally-act-globally/
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