The chloride system assumed by the writers (ibid., v. 63, no. 6, p. 622-635, 1968) is too simple as a model for the many complex natural systems with As, Sb, Te, and S. Great acidity is not necessary if associated Fe is of local derivation, which is consistent with abundance of carbonate in some gold ores. Dilatancy and related pressure effects are probably more important than temperature.

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