Sir: In their paper concerning the geology, mineralization, alteration, and structural evolution of the El Teniente Cu-Mo deposit in Chile, Cannell et al. (2005) concluded that El Teniente, despite its anomalously large size, is a typical porphyry Cu-Mo deposit with regard to its alteration and sulfide assemblage zonation and the genetic association of mineralization with dacite intrusions.

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We do not agree that the dacite porphyries were the causative intrusions for copper mineralization. Instead, most of the mineralization was emplaced in conjunction with the formation of multiple hydrothermal breccia pipes and their associated veins that were derived from a large, deep...

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