Sir: The recent paper by Cunningham et al. (2004) presents reconnaissance apatite and zircon fission track, conodont alteration index, vitrinite and solid bitumen reflectance, and stable isotope data documenting the extent of the paleothermal anomaly associated with the 37 Ma Bingham Canyon porphyry Cu-Au-Mo deposit. Based on these data, the paleothermal anomaly encompasses the Barneys Canyon and Melco sediment-hosted gold deposits. The authors conclude that the gold deposits are genetically related to the Bingham porphyry system and that the maximum sustained temperature was 100° to 140°C at Melco and near 100°C at Barneys Canyon. Cunningham et al. (2004) contend that...

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