What is Acid Mine Drainage?. Acid mine drainage, sometimes referred to as AMD, results when the mineral pyrite (FeS 2 ) is exposed to air and water, resulting in the formation of sulfuric acid and iron hydroxide. For chemists, the equation for AMD formation is:
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FeS2 + 3.75 O2 + 3.5 H2OÂ <-------> Fe(OH)3 + 2 H2SO4