While the list of retailers aligned in their opposition to
dirty gold continues to grow longer, most gold remains quite filthy.
The majority of the world’s gold is extracted from open pit mines, where
huge volumes of earth are scoured away and processed for trace
elements. Earthworks estimates that, to produce enough raw gold to make a single ring, 20 tons of rock and soil are dislodged and discarded. Much of this waste carries with it mercury and cyanide,
which are used to extract the gold from the rock. The resulting erosion
clogs streams and rivers and can eventually taint marine ecosystems far
downstream of the mine site. Exposing the deep earth to air and water
also causes chemical reactions that produce sulfuric acid, which can leak into drainage systems. Air quality is also compromised by gold mining, which releases hundreds of tons of airborne elemental mercury every year.
http://congaconflict.wordpress.com/2014/02/20/the-environmental-disaster-that-is-the-gold-industry/
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