The experts also write that the cumulative polluting effects of extracting resources simultaneously from both the Mining Arch and the bitumen-rich Orinoco Oil Belt could be irreversible.
On top of the already widespread use of mercury by artisanal miners, they worry that pollution would just get worse once big companies set up large tailings dams containing water contaminated with cyanide.
read more.... http://www.mining.com/venezuelas-mining-arch-spotlight/
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