Rupela said this work had allowed the authorities to control rivers previously devastated by artisanal miners. The environment had been damaged by the miners' use of mercury and of borax (sodium borate). The latter is not as acutely toxic as mercury.
The clean-up had managed to improve the quality of the Chimeza, Lucite, Nhancuarara and Zambuzi rivers. But there are still high levels of pollutions in the two largest rivers concerned, the Pungoe and the Revue.
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