Sir: The El Teniente Cu-Mo deposit in central Chile is an extraordinary accumulation of Cu-Mo ore (Fig. 11), and we welcome the opportunity provided by Skewes and Stern (2007) to discuss and clarify several important issues regarding its classification and interpretation, and to address several incorrect assertions that they make regarding our manuscript (Cannell et al., 2005). We have interpreted El Teniente to be a typical porphyry deposit, in terms of its alteration assemblages, vein and breccia styles, and spatial and temporal relationships between Cu-Mo mineralization and felsic porphyries. Skewes and Stern (2007) dispute our claims...

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