N. Håkan Tarras-Wahlberg,^* Adriana Flachier,^** Göran Fredriksson,^*** Stuart Lane,^**** Bo Lundberg,^***** Olof Sangfors<sup>******

*</sup>Håkan Tarras-Wahlberg works as a consultant for the company Swedish Geological AB, with many of his assignments being related to environmental management within the mining sector. He holds an undergraduate degree in geology from the University of Cape Town and MPhil in geography from the University Cambridge. He is presently reading for a PhD in Cambridge, UK. His research focuses on metal contamination in water and water quality policy issues. His address: Swedish Geological AB, Box 19090, SE-10432 Stockholm, Sweden. hakan.tarraswahlberg.sgab@hifab.se
^**Adriana Flachier is a consultant biologist with an MSc from the Vrije University of Brussels. Her specialities include aquatic ecology of rivers, estuaries and wetlands and her assignments are often within the fields of aquatic pollution and water-quality assessments. Her address: Prodeminca, General Baquedano 222 y Reina Victoria, Casilla 17-21-95, Quito, Ecuador. flachier_troya@hotmail.com
^***Göran Fredrikson is a senior consultant with Swedish Geological AB in Stockholm. He obtained his undergraduate degree in geology and chemistry at the University of Stockholm, and has a PhD in geology and chemical engineering from the University of Texas, Austin, USA. He has worked for many years as an economic and exploration geologist. His address: Swedish Geological AB, Box 19090, SE-10432 Stockholm, Sweden. goran.fredrikson.sgab@hifab.se
^****Stuart Lane is professor of physical geography at the University of Leeds, UK. He has a PhD in geography from the University of Cambridge. His research focuses on monitoring and modelling river channel processes, including flow, sediment transport and water quality issues. His address: School of Geography, University of Leeds, Leeds, LS2 9JT, UK. s.lane@geography.leeds.ac.uk
^*****Bo Lundberg is senior consultant with Swedish Geological AB in Stockholm, and holds a PhD from the University of Lund, Sweden. He has been involved in international mining projects for many years and his expertise includes institutional development, sectoral environmental assessments and the elaboration of environmental policies for the mining sector. His address: Swedish Geological AB, Box 19090, SE-10432 Stockholm, Sweden. b.lundberg.sgab@hifab.se.
^******Olof Sangfors is consultant biologist at the Swedish Environmental Research Group, and holds an MSc from the University of Göteborg. His expertise includes ecological field monitoring, ecotoxicological testing and environmental impact and hazard assessments. His address: Swedish Environmental Research Group, Sjöleden 9, Fryksta, SE-665 91 Kil, Sweden. olof.sangfors@mfg.se