Sir:Ressel et al.’s (2000b, p. 1417) assertion that "Eocene magmatism is considered the major process that drove hydrothermal circulation, which formed Carlin-type deposits of the Carlin trend" and conclusion (p. 1438) that "Deposits of the northern Carlin trend should be considered pluton related" are not supported by credible evidence.

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Ressel et al. (2000b) attributed the 700 km2 aeromagnetic anomaly south of the Carlin trend to an Eocene pluton, based on the association of exposed Eocene stocks with aeromagnetic anomalies and on the presence of Eocene dikes within and beyond the anomaly. The same reasoning could equally well...

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