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Youanmi, Sandstone Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 28° 36' 39'' South , 118° 49' 52'' East
Latitude & Longitude (decimal): -28.61093,118.83139
GeoHash:G#: qdut0pd37
Köppen climate type:BWh : Hot deserts climate


The listing can refer to a number of aspects. Youanmi can refer generally to the gold mining field which contained one large mine and several small operations. Or to the state battery which used to be located at the site. The now abandoned town which grew initially with gold mining in the area. Lastly, the Youanmi gold mine which was the largest in the area. Information will be concentrated on the Youanmi gold mine. It is 82 kilometres south south-west of Sandstone.

Gold was found in the area in 1894 or 1985 by prospector Tom Payne. Serious mining however did not take place till 1907. The Youanmi Gold Mine Limited operated the mine from 1911, but struggled during World War One with a shortage of labour and high costs, and finally closed in 1922. It employed around 100 men.

In 1934, the Youanmi Gold Mining Limited was floated in London with the intention of re-opening the mine as an underground operation. Production started in 1936. At this time the town of Youanmi was constructed to service the mine which employed around 200 men. Thirteen leases were purchased totalling 351 acres. Mine manager was P Fitzgerald. In 1942 the mine suddenly closed, citing poor ore at depth. There was a chaotic exodus from the town which was abandoned on a permanent basis.

A large open pit was developed between 1986 to 1989. In 1995 underground mining commenced again producing 50 000 to 60 000 oz gold at 11.5 g/t. In 1997 the mine closed again due to low gold prices. In 2000 Aquilla Resources took over the mine, and sold it in 2003 to Goldcrest Resources, who sold it to Apex Minerals NL in 2007. Apex considered opening the mine then abandoned the idea in favour of other mines it owned in the region. At the time of writing (April 2013) Apex is in the middle of selling the mine to Infinity Fame Pty Ltd.

The deposit is located in the north-west trending Youanmi Greenstone Belt of tholeiitic basalts and intrusives with minor banded iron formations and felsic pyroclastics. This is overlain by gabbro, pyroxenite, anorthosite and magnetite rich rocks of a layered intrusion.

There is intense shearing in the greenstone adjacent to the granite intrusion, and this contact zone contains the gold. The intrusion shows coarse grained quartz-plagioclase-microcline-biotite-adamellite. The gold bearing shear zone is sericite-quartz-sulphides, and are sub-parrallel with the granite and greenstone contact.

Weathering to 80 metres has reduced most of the rocks to clay and goethite. The host mafic rock contains abundant magnetite. Within this is interbedded intervals of tuffaceous sediments, and minor banded iron formations, with magnetite pseudomorphed by pyrite near the shears. Gold is found in the shear zones forming a lattice network extending 20 metres in the adamellite and to 100 metres in the greenstone along a 1 kilometre strike length. Gold occurs within pyrite and arsenopyrite, with sericite, quartz, chlorite, largely barren of gold either side of the shears.



Mineral List

Mineral list contains entries from the region specified including sub-localities

33 valid minerals.

Rock Types Recorded

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Rock list contains entries from the region specified including sub-localities

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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: 910287
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


Localities in this Region
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Australia

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References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hughes F.E.(ed)( ): Youanmi Gold Deposit, Geology of the Mineral deposits of Australia and Papua New Guinea, AusIMM Melbourne ( ):14(1): 279-282
The Western Mail newspaper (Perth) (1935): Youanmi Mine Manager
(18 Jul 1935)
The Daily News newspaper (Perth) (1942): Youanmi Exodus (17 Jan 1942)
The West Australian newspaper (Perth)(1936):Youanmi Report (07 Jan 1936)
The Kalgoorlie Miner newspaper (1935): Youanmi Gold Mines Ltd
(06 Apr 1935)
The Daily News newspaper (Perth)(1942):Youanmi Mine Dismantled
(12 Jan 1942)

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