In that region of the Guianas, “there are operators from China working in territories where there is a strong presence of illegal mining,” Bram Ebus, founder of Amazon Underworld, told Diálogo. “It is the Chinese who buy the sand already treated with mercury, which captures between 25 percent and 30 percent of the gold, and then process it in their country in cyanidation plants, where the remaining gold is recovered in much higher percentages.”
read more... https://dialogo-americas.com/articles/china-and-the-amazons-illegal-gold-the-plot-behind-clandestine-mining/