Mine waters: Acidic to circumneutral




Acid mine waters, often containing toxic concentrations of Fe, Al, Cu, Zn, Cd, Pb, Ni, Co, and Cr, can be produced from the mining of coal and metallic deposits. Values of pH for acid mine waters can range from –3.5 to 5, but even circumneutral (pH ≈ 7) mine waters can have high concentrations of As, Sb, Mo, U, and F. When mine waters are discharged into streams, lakes, and the oceans, serious degradation of water quality and injury to aquatic life can ensue, especially when tailings impoundments break suddenly. The main acid-producing process is the exposure of pyrite to air and water, which promotes oxidative dissolution, a reaction catalyzed by microbes. Current and future mining should plan for the prevention and remediation of these contaminant discharges by the application of hydrogeochemical principles and available technologies, which might include remining and recycling of waste materials.

Publication type Article
Publication Subtype Journal Article
Title Mine waters: Acidic to circumneutral
Series title Elements
DOI 10.2113/gselements.7.6.393
Volume 7
Issue 6
Year Published 2011
Language English
Publisher Mineralogical Association of Canada
Contributing office(s) National Research Program - Central Branch
Description 6 p.
First page 393
Last page 398
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