Mineralogy and PTX Relationships of the Archean Hannan South Au-Cu (Co-Bi) Deposit, Kalgoorlie, Western Australia: Thermodynamic Constraints on the Formation of a Zoned Intrusion-Related Skarn

The Hannan South Au-Cu skarn deposit is located 12 km southeast of Kalgoorlie in the 2.7 Ga Eastern Goldfields Orogen of the Archean Yilgarn Craton, Western Australia. Two epidote-quartz-calcite-magnetite orebodies, controlled by the same reverse fault but separated by 450 m, occur in granodiorite porphyry: an Au-Cu skarn in the southeast (30 vol % calcite) and an Au-Co-Bi skarn in the northwest (5–10 vol % calcite). Both are interpreted as...