1. American Water Works Association and Water Environment Federation, 2005. Standard Methods for the Examination of Water and Wastewater. Washington, DC 20001-3710.
2. Azzie, B.A., 2002. Coal mine waters in South Africa: their geochemistry quality and classification. PhD thesis, University of Cape Town, South Africa.
3. Mine-water 506 chemistry: the good, the bad and the ugly;Banks;Environ. Geol.,1997
4. Environmental impacts associated with an abandoned mine in the Witbank Coalfield, South Africa;Bell;Int. J. Coal Geol.,2001
5. Acid-neutralization mechanisms in inactive mine tailings;Blowes,1994