1. Alarcon LE 1997 . Long term mine site rehabilitation studies at Stockton open-cast coal-mine . Unpublished M.Sc. Thesis in Geology, University of Canterbury, Christchurch .
2. Arnold DE 1991 . Diversion wells – a low-cost approach to treatment of acid mine drainage . Proceedings, Twelfth West Virginia Surface Mine Drainage Task Force Symposium , April 3–4 , 1991 . Morgantown , WV .
3. Manganese removal from mine waters – investigating the occurrence and importance of manganese carbonates
4. Bigham JM 1994 .Mineralogy of ochre deposits formed by sulfide oxidationJL Jambor , DW Blowes The environmental geochemistry of sulfide mine-wastes. Short Course Handbook, Vol. 22. Quebec, Canada, Mineralogical Association of Canada . 103 132 .