About 20% of the world's gold is produced by the artisanal and small-scale gold mining sector. This sector is also responsible for the largest releases of mercury to the environment of any sector globally. A major source of air pollution from mercury, artisanal and small-scale gold mining releases approximately400 metric tons of airborne elemental mercuryeach year.
http://www.epa.gov/oia/toxics/mercury/asgm.html
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