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Mount Gibson Gold Mine, Mount Gibson Conservation Reserve, Retaliation Goldfield, Yalgoo Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 29° 44' 52'' South , 117° 9' 34'' East
Latitude & Longitude (decimal): -29.74787,117.15952
GeoHash:G#: qdeqf08fn
Locality type:Mine
Köppen climate type:BSh : Hot semi-arid (steppe) climate


Located 28 kilometres south-west of the Mount Gibson Homestead. The station is now a privately owned nature reserve.

Two hundred metres south-east of the mining camp is a historic shaft with a termite ridden headframe. This is called Tobias Find mined sometime between 1910 to 1916, but gold production from it was not significant.

In modern times the deposit was discovered by Reynolds Metals Australia Ltd in 1983, and subsequently mined from 1986 producing 1 g/t Au. The mine closed in 2006, and was owned at that stage by Legend Mining.

There are 8 pits running north-south for 6 kilometres called Enterprise, Donkey D, Orion, Orion North, Wombat, Deep South, Hornet and Orion 2. Further, the small Highway Pit is a few kilometres to the north-west.

The ore is found beneath a laterite bedrock revealing supergene oxide and sulphide zones in the first six locations, and primary Au-Ag in the last two. The deposits are located in the Retaliation Belt, the southern portion of the Yalgoo-Singleton Greenstone Belt. This is composed of Archaean metavolcanics and intrusive felsic rocks and shearing which has been metamorphosed to mid amphibolite facies.

The mineralisation is hosted in the Mt Gibson Shear Zone, 1 kilometre wide, striking north north-east, and dipping steeply to the west. This is a shear network composed of a rock called a mine sequence, dominated by variably differentiated tholeiitic metabasalt and metadolerites, with lesser magnesium metabasalts and quartz feldspar porphyries.

The mine sequence hosts the gold consisting of steeply dipping lenses of sulphide bearing schist, predominantly within quartz-biotite and altered chlorite mafic rocks.

At Orion 2, there are two styles of mineralisation:
1) spessartine/almandine garnet/gahnite, and cordierite-muscovite bearing schists, forming a coherent strataform horizon overlying the main ore zone, associated with sphaletite-galena-pyrite with lesser pyrrhotite-chalcopyrite and tetrahedrite. It is an unusual assemblage to find gold.
2) a more typical metamorphic sheared quartz-biotite and sulphide altered envelope associated with pyrrhotite-pyrite and chalcopyrite. Free gold is rare.

There is a strong relationship between high grades of gold with the pyrrhotite-pyrite-chalcopyrite assemblage, suggesting gold was formed during the event which created these minerals.

At the Enterprise Pit there is a gold bearing bedrock with quartz veining in sheared metabasalts with mixed sulphides of pyrites, pyrrhotite, chalcopyrite, sphalerite and galena. This is overlain by twenty metres of bleached saprolite consisting of white kaolinised clays and associated green smectitic clays with quartz veins up to one metre thick, and rare ferruginous basic dykes. This in turn is overlain by ferricrete consisting of hematite, kaolin, quartz and goethite. Above this is 3 to 4 metres sandy clay, and the top 1 metre a hardpan with thin coatings of Mn oxide.


Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


19 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

Quaternary
0 - 2.588 Ma



ID: 796103
colluvium 38491

Age: Pleistocene (0 - 2.588 Ma)

Description: Colluvium and/or residual deposits, sheetwash, talus, scree; boulder, gravel, sand; may include minor alluvial or sand plain deposits, local calcrete and reworked laterite

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: 3187503
Archean intrusive rocks

Age: Archean (2500 - 3200 Ma)

Comments: Yilgarn Craton

Lithology: Intrusive igneous 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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References

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Hough, R., Phang, C., Anand, R. (2003), Mineral Hosts For Gold- a study of transported overburden at the Enterprise Pit Mt Gibson gold deposits, CRC LEME (2003)
Yeats, C.J., McNaughton, N.J., Groves, D.I. (1996), SHRIMP U-Pb Geochronological Constraints on Archaean Volcanic Hosted Massive Sulphide and Lode Gold Mineralisation at Mount Gibson Yilgarn Craton Western Australia, Economic Geology (1996):91:1354-1371
Yeats, C.J., Groves, D.I. (1998), The Archaean Mount Gibson Gold Deposits Yilgarn Craton Western Australia- products of combined synvolcanic and syntectonic alteration and mineralisation, Ore Geology Review, (1998):13

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