Impacts of Resource Development on Native American Lands

The Zortman Landusky gold and silver mine has released over a dozen cyanide spills causing extensive surface and groundwater contamination, including one spill that released 52,000 gallons of cyanide solution that contaminated the drainage that supplies fresh drinking water for the town of Zortman. A mine employee discovered the accident when he noticed the smell of cyanide in his tap water at home. 
http://serc.carleton.edu/research_education/nativelands/ftbelknap/hydrology.html