Acid mine drainage

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  1. Acidic drainage from bituminous coal mines containing a high concentration of acidic sulfates, esp. ferrous sulfate. See also: acid water
  2. Drainage with a pH of 2.0 to 4.5 from mines and mine wastes. It results from the oxidation of sulfides exposed during mining, which produces sulfuric acid and sulfate salts. The acid dissolves minerals in the rocks, further degrading the quality of the drainage water. AGI
    Source: Dictionary of Mining, Mineral, and Related Terms


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