Toxic waste is a devastating consequence of dirty gold mining practices. Cyanide heap leaching is the cheapest way to extract gold and as a result, is commonly used around the world. The process leaves behind mounds of wasted rock and leaking toxic materials. And because leaching is a time consuming process that takes months, contamination of the surrounding environment with cyanide is nearly impossible to control.
http://www.brilliantearth.com/gold-mining-environment/
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