Marcello Veiga is heading to Colombia on Wednesday where he will be singing to about 600 miners in 11 states about the dangers of using highly toxic mercury in extracting gold.
Worldwide, artisanal and small-scale gold mining in rural areas is the single biggest industrial user of mercury at about 1,400 tonnes a year.
Other countries where significant amounts of mercury is used in artisanal gold mining include Peru, Ecuador, Zimbabwe and Indonesia.
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