Acid Rock Drainage (ARD)
  Drainage that occurs as a result of oxidation of sulfide materials (usually pyrite, or iron sulfide) contained in rock that is exposed to air and water. The oxidation of sulfides produces sulfuric acid and sulfate salts. The acid dissolves and leaches out minerals in the rock, further degrading the quality of the drainage water. See also: Acid Mine Drainage (AMD).
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