1. Alpers CN, Nordstrom DK, Thompson JM (1993) Seasonal variations of Zn/Cu ratios in acid mine water from Iron Mountain, California. Environ Geochem Sulfide Oxid ACS Symp Ser Ch 22:324–344
2. Alpers CN, Blowes D, Nordstrom DK, Jambor J (1994) Secondary minerals and acid mine-water chemistry. Mineral Assoc Canada Short Courses 22:247–270
3. American Public Health Association (APHA) (2005) Standard methods for the examination of water and wastewater, 21st edn. The American Public Health Assoc, the American Water Works Assoc, and the Water Environment Federation, Washington DC, pp 258–259
4. American Public Health Association (APHA) (2012) Standard methods for the examination of water and wastewater, 22nd edn. The American Public Health Assoc, the American Water Works Assoc, and the Water Environment Federation, Washington DC
5. Bigham JM, Schwertmann U, Traina SJ, Winland RL, Wolf M (1996) Schwertmannite and the chemical modeling of iron in acid sulfate waters. Geochim Cosmochim Acta 60(12):2111–2121