https://www.hrw.org/news/2015/06/12/dispatches-gold-refiners-should-act-child-labor
Dispatches: Gold Refiners Should Act on Child Labor | Human Rights Watch
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https://www.rti.org/publication/fractional-mercury-levels-brazilian-gold-refiners-miners
Fractional Mercury Levels in Brazilian Gold Refiners and Miners | RTI
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