1. International Zinc Association Durham North Carolina USA
2. CSIRO Land and Water Lucas Heights Australia
3. GLEC Traverse City Michigan USA
4. US Environmental Protection Agency Washington DC
5. GEI Consultants Fort Collins Colorado USA
6. Wilfred Laurier University Waterloo Ontario Canada
7. wca environment Faringdon Oxfordshire UK
8. Environment Agency Howbery Park Wallingford UK