One of the chemicals that is most problematic when it escapes a mine is cyanide. A well-known poison, cyanide is also used to mine gold and silver. In certain cases, cyanide may end up accidentally being spilled into the environment.
Normally, cyanide is safely disposed of when it disperses into the atmosphere under appropriate conditions, where sunlight will break it down to non-toxic chemicals.
http://goldrushcam.com/sierrasuntimes/index.php/news/local-news/3242-usgs-mineral-science-shows-promise-for-reducing-mining-impacts
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