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Acid mine drainage is the result of the exposure of pyrite to oxygen and water. Pyrite is found in association with coal deposits, and when weathered, releases iron and acidity to the waters. Once these waters reach the surface, iron oxidizes and precipitates iron hydroxide (yellow boy) on the stream bottoms, choking out most aquatic life. https://images.squarespace-cdn.com/content/v1/61803b18879f384941cdda36/ac188f66-df5a-4f68-88a9-61206d3bbfd9/Stndp4-3-13-08.JPG Home - How Are We Treating Acid Mine Drainage? Mine drainage can be successfully treated by active chemical addition, however, this method has high building and maintenance costs. Passive treatment methods, which are far less expensive, have begun to be used to treat mine drainage. 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