Gold-rich volcanogenic massive sulfide (VMS) deposits are a subgroup of lode gold deposits, as defined by Poulsen et al. (2000). They are commonly defined by an average gold grade in grams per tonne greater than that of the combined base metals in weight percent (Au g/t > Cu + Zn + Pb wt percent: Poulsen et al., 2000). Five of the largest and best examples of Au-rich VMS deposits currently recognized in the world are located in the Blake River Group in the Abitibi greenstone belt, Quebec, Canada. The Horne (54.3 Mt at 6.1 g/t Au, 11.7 Moz...

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