On the cover: Composite geologic map of the Bingham porphyry deposit illustrating the location of faults, morphology of intrusions, and copper and gold grades. Based on mine geology maps by A.J. Maughan and A.J. Swenson (1990), and Utah Copper geology staff in prior years, 1:600 scale open-pit mapping by Redmond (2002), and Atkinson and Einaudi (1978). The geology and ore deposits of this region are described in a series of three papers, by Redmond and Einaudi, Gruen et al., and Landtwing et al., in this issue.