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Definition of Acid mine drainage

Acid mine drainage Definition from Science & Technology Dictionaries & Glossaries
EIA Energy Glossary
This refers to water pollution that results when sulfur-bearing minerals associated with coal are exposed to air and water and form sulfuric acid and ferrous sulfate. The ferrous sulfate can further react to form ferric hydroxide, or yellowboy, a yellow-orange iron precipitate found in streams and rivers polluted by acid mine drainage.
Source: Energy Information Administration, 2006
Acid mine drainage Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
Acid mine drainage, acid and metalliferous drainage (AMD), or acid rock drainage (ARD) refers to the outflow of acidic water from metal mines or coal mines.

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Acid mine drainage Definition from Society & Culture Dictionaries & Glossaries
EPA Terms of Environment
Drainage of water from areas that have been mined for coal or other mineral ores. The water has a low pH because of its contact with sulfur-bearing material and is harmful to aquatic organisms.
Provided as a public service by the U.S. Environmental Protection Agency
Environmental Engineering (English ver.)
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 acid), because of its contact with sulfur-bearing material; acid drainage is harmful because it often kills aquatic organisms.
Acidic water that flows into streams from abandoned mines or piles of mining waste or tailings. The acid arises from the oxidation of iron sulfide compounds in the mines by air, dissolved oxygen in the water, and chemoautotrophs, which are bacteria that can use the iron sulfide as an energy source. Iron sulfide oxidation products include sulfuric acid, the presence of which has reduced or eliminated aquatic life in many streams in mining regions. Also see Open-Pit Mining and Yellowboy. Also referred to as Acid Mine Waste.