AMD(Acid Mine Drainage) is acid that seeps through rock, creating a brew of toxic heavy metals. It is caused by Sulfuric acid which is created when water and air chemically combine with exposed sulfides in the rock. A brownfield clean-up is when Humboldt Mill crushes and grinds rock mined at the company's Eagle Mine. Then nickel and copper concentrates will be separated from the rock and sent to processing facilities. By opening this mine, it will be the
only primary nickel mining operation in the United States. Kennecott will take all water collected from the temporary development rock storage area and put it through a water treatment plant, to purify it for drinking water.
http://www.northwoodswild.og/projects/sulfide-and-uranium-mining
http://www.eagle-project.com/library/media/Heartland_Institute.pdf
http://www.eagle-project.com/our-company21st-Century-Mining/
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