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Hannan South deposit, Kalgoorlie-Boulder, Kalgoorlie-Boulder Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 30° 53' 26'' South , 121° 32' 50'' East
Latitude & Longitude (decimal): -30.89061,121.54747
GeoHash:G#: qdw2mbs1j
Locality type:Deposit
Köppen climate type:BSh : Hot semi-arid (steppe) climate

An Au-Cu skarn deposit.

Two epidote-quartz-calcite-magnetite, fault-controlled ore-bodies: an Au-Cu skarn in the southeast and an Au-Co-Bi skarn in the northwest.

Part of a cluster of intrusion-related Au-Cu and distal Ag-Au-Pb-Zn deposits located within 12 km E to SE of the giant Golden Mile at Kalgoorlie. Also part of a larger genetic group including the diorite-hosted Boddington porphyry skarn deposit.

Located 12 km southeast of Kalgoorlie in the 2.7 Ga Eastern Goldfields Orogen of the Archean Yilgarn Craton.

Both skarns are believed to be the remnants of a single eroded body. They are 450 metres apart. Each shows different mineralogy. The south-east shows magnetite, rutile, hematite and Fe rich epidote, while the north-west skarn shows magnetite, rutile, ilmenite and lower Fe epidote.

The south-east skarn shows sphalerite, galena, and an un-named Ag-Bi alloy. Minor gold and electrum has precipitated together with chalcopyrite and pyrite. It also contains traces of hessite, tetradymite and aikinite.

Biotite is only found on the north-east skarn front. Fluid cooling and reduction has caused the deposition of pyrite, minor cobaltite, native gold, and bismuth minerals leading to large scale enrichment of gold and bismuth. The skarn shows abundant bismuth sulfosalts including krupkaite, pekoite, junoite, felbertalite, nuffieldite and cosalite, and tellurosulfides including joseite and aleksite.

Since the above was written, two small open pits have been developed in the immediate area. If the pits mark the skarns, then possibly they are south-west to north-east from each other.

Mineral List

26 valid minerals.

Rock Types Recorded

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

0 - 2.588 Ma

ID: 810311
lake deposits 38492

Age: Pleistocene (0 - 2.588 Ma)

Description: Lake and swamp deposits; mud, silt, evaporites, limestone; minor sand, peat

Comments: regolith; synthesis of multiple published descriptions

Lithology: Regolith

Reference: Raymond, O.L., Liu, S., Gallagher, R., Zhang, W., Highet, L.M. Surface Geology of Australia 1:1 million scale dataset 2012 edition. Commonwealth of Australia (Geoscience Australia). [5]

Neoarchean - Mesoarchean
2500 - 3200 Ma

ID: 3187518
Archean volcanic rocks

Age: Archean (2500 - 3200 Ma)

Comments: Yilgarn Craton

Lithology: Greenstone belt; mafic-ultramafic volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

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Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Lawrance, L. M.; Griffin, B. J. (1994): Crystal Features of Supergene Gold at Hannan South, Western Australia. Mineralium Deposita (1994):29: 391-398.
Mueller, A. G. (2007): Copper-gold Endoskarns and High-Mg Monzodiorite-tonalite Intrusions at Mt. Shea, Kalgoorlie, Australia- implications for the origin of gold-pyrite-tennantite mineralization in the Golden Mile. Mineralium Deposita (2007):42: 737-769.
Mueller, Andreas G.; Lawrance, Louisa M.; Muhling, Janet; Pooley, Gregory D. (2012): 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. Economic Geology (2012):107: 1-24.

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