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small scale producer levels of gold gabon

1 Introduction Artisanal and smallscale mining ASM of gold Au has been studied worldwide due to the use and release of mercury Hg to the environment Veiga 1997 Veiga et al 2006 Veiga et al 2009 Shandro et al 2009 Spiegel and Veiga 2010 VelasquezLopez et al 2010The Global Mercury Assessment estimated that ASM of gold released 727 t metric tonnes of Hg to the

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