Geochemical Assessment of Metals and Dioxin in Sediment from the San Carlos Reservoir and the Gila, San Carlos, and San Francisco Rivers, Arizona
(Englisch)
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Phelps Dodge Morenci, Inc., is actively mining for Cu at the Morenci deposit near Clifton, Ariz. Our understanding of the environmental effects of metal mining on aquatic life has increased subtantially since the mine began open-pit operation. We were asked by the Bureau of Indian Affairs, on behalf of the San Carlos Apache Indian Tribe, to assess the possible impact that mining activities upstream may have had on the aquatic resources in the reservoir because several of the metals associated with porphyry Cu mineral production are known to be potentially toxic to aquatic life. Sampling of the San Carlos Reservoir-and the Gila, San Carlos, and San Francisco Rivers-was undertaken October 20-29, 2004, to evaluate the source of metal anomalies in the resevoir sediment.