Acid Mine Drainage (AMD)
auch: saure Sicker- und Grubenwässer
Drainage of water from areas that have been mined for coal of other mineral ores; the water has low pH, sometimes less than 2.0 (is acidic), because of its contact with sulfur-bearing material; acid drainage is harmful because it often kills aquatic organisms.
Acidic runoff water from mine waste dumps and mill tailings ponds containing sulphide minerals. Also refers to ground water pumped to surface from mines.
Low pH drainage water from certain mines usually caused by the oxidation of sulphides to sulphuric acid. Mine drainage can also contain high concentration of metal ions.
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