Sir: Ricardo Presnell and W. T. Parry (2005) have offered a discussion of our recent paper concerning the paleothermal anomaly associated with the Bingham Canyon porphyry copper deposit and disseminated gold deposits that lie within that anomaly (Cunningham et al., 2004). In that paper we show that a variety of geothermometers indicate that the rocks that host the Melco deposit (6 km north of the Bingham pit) and the Barney’s Canyon deposit (7.5 km north) have not been heated to more than approximately 140°C (Melco) and 100°C (Barneys Canyon) for periods in excess of about 105 years....

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