Sir: In their paper, entitled “Constraints on the Genesis of the Archean Oxidized, Intrusion-Related Canadian Malartic Gold Deposit, Quebec, Canada,” Helt et al. (2014) present oxygen and hydrogen isotope data, and discuss the origin of the hydrothermal fluids that formed the Canadian Malartic gold deposit. On the basis of the calculated hydrogen (−53 to −46‰) and oxygen (5.2–8.5‰) isotope compositions, Helt et al. (2014, p. 731) argued that the hydrothermal fluid that formed the Canadian Malartic gold mineralization and associated potassic alteration falls “within the relatively small field of typical magmatic-hydrothermal fluids.”

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The quartz and biotite δ18O...

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