Abstract

Petzite, hessite, altaite, calaverite, sylvanite, and coloradoite are found in the high-grade parts of epithermal gold veins. These tellurides completely fill small vugs and minute fractures in the veins and replace gold and most of the sulfides. Many assemblages are present. In the discussion by Cabri, it is pointed out that Callow and Worley are led to erroneous conclusions about formation temperatures in gold deposits by their dependence on out-of-date mineral stability data.

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