To the Editor: In our paper entitled “An Experimental Study of the Solubility and Speciation of MoO3(s) in Hydrothermal Fluids at Temperatures up to 350°C,” we reported results of a study designed to determine the solubility of MoO3(s) in NaCl-bearing aqueous fluids at elevated temperature. We did so in order to gain insights into the manner in which Mo is transported in the saline fluids that form porphyry Mo and Cu-Mo ore deposits. Related objectives were to identify the dominant aqueous Mo species and retrieve thermodynamic data for these species. The results of this study show...

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