Ninja mining releases mercury into the environment during processing; first when metallic mercury is used to wash and concentrate gold and small amounts are washed out along with tailings and sediment, second when mercury vapors are created during the burning process—isolated ore is burned to evaporate the mercury and leave the concentrated gold behind—and inhalation occurs, or the same pots used to separate mercury and gold are used for cooking.
http://climate.america.gov/2011/12/15/guest-blog-steve-frisch-on-ninja-gold-mining/
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