Gold mining requires the use of toxins to separate the gold from waste. Belo Sun has said that it will use cyanide to process the 5 million ounces of gold it expects to extract from the project. Residents and activists fear that a spill of these toxic materials would prove disastrous to the Xingu River, impacting communities already made vulnerable by deforestation and the Belo Monte dam.
https://news.mongabay.com/2017/02/judge-halts-excavation-plans-for-largest-ever-brazilian-goldmine/
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