On the side of a rural highway leading south from the city of Kaya in central Burkina Faso, Boureima Ouedraogo mixes gold ore slurry with soapy water in a rusted oil drum, then pours it down a crude metal sluice into a shallow pit. He plies a small mine just over a stubby plateau nearby with a dozen other men, some of whom are mixing clean ore with toxic mercury in blue plastic tubs.
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