1. EVS Environment Consultants, 195 Pemberton Avenue, North Vancouver, British Columbia, Canada V7P 2R4
2. Kennecott Utah Copper Corporation, P.O. Box 6001, 8315 West 3595 South, Magna, Utah 84044-6001
3. International Lead Zinc Research Organization, 2525 Meridian Parkway, Durham, North Carolina 27713