Small-scale gold mining operations and artisans are the world’s largest
users of mercury, who employ it to extract gold from ore (the mercury
binds to the gold and is then burned off, leaving the gold behind and
releasing mercury into the air). Metal smelting and refining are also
significant contributors to mercury pollution. Atmospheric mercury falls
back to earth via precipitation and enters the ocean through rivers and
groundwater systems.src Electronics and other consumer goods are also major sources of mercury.
http://matadornetwork.com/change/the-5-biggest-crises-facing-our-oceans-today-and-why-you-should-care/
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