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FORMATION OF A PALEOTHERMAL ANOMALY AND DISSEMINATED GOLD DEPOSITS ASSOCIATED WITH THE BINGHAM CANYON PORPHYRY Cu-Au-Mo SYSTEM, UTAH—A REPLY

Charles G. Cunningham

U.S. Geological Survey, 954 National Center, Reston, Virginia 20192

Gerry W. Austin

Kennecott Utah Copper Co., P.O. Box 232, Bingham Canyon, Utah 84006

Charles W. Naeser

U.S. Geological Survey, 926A National Center, Reston, Virginia 20192

Robert O. Rye

U.S. Geological Survey, MS-963, Box 25046, Denver Federal Center, Denver, Colorado 80225

Geoffrey H. Ballantyne

Rio Tinto Technical Services, 5295 South 300 West, Suite 300, Murray, Utah 84107

Robert G. Stamm

U.S. Geological Survey, 926A National Center, Reston, Virginia 20192

Charles E. Barker

U.S. Geological Survey, MS-977, Box 25046, Denver Federal Center, Denver, Colorado 80225

Corresponding author: e-mail, cunningham@usgs.gov

The first 20% of the full text of this article appears below.

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. We also conclude that the paleothermometry in combination with chemical and isotopic data is consistent with a model wherein the gold deposits formed as a result of mixing of acidic, oxidized, and isotopically heavy water from a crater lake with reduced gold-bearing meteoric water. The latter may have been derived from the waning stages . . . [Full Text of this Article]

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