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Yuinmery prospects, Youanmi, Sandstone Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 28° 32' 15'' South , 119° 6' 23'' East
Latitude & Longitude (decimal): -28.53759,119.10665
GeoHash:G#: qdutwkfu6
Locality type:Group of Prospects
Köppen climate type:BWh : Hot deserts climate

Located 8 km east north east of the former Youanmi township are a series of copper, gold, nickel and zinc prospects. Located 80 kilometres south-west of Sandstone and 5 kilometres north-east of the Youanmi mine.

Located in the Youanmi Greenstone Belt, a synclinal sequence of chloritised felsic tuffaceous rocks, sulphide bearing chert, gabbros, basalt and ultramafics.

The copper-gold is found in the felsic volcanics and platinum group elements- nickel in large layers of the mafic/ultramafic intrusive complex. Marston states hosted by chert, banded iron formation, felsic pyroclastic rocks, overlying metabasalt in a major synformal structure, with intruding metagabbro and granophyre. It contains widespread low grade pyrite-pyrrhotite-magnetite-chalcopyrite, disseminated and thin massive zones.

The Just Desserts prospect contains an estimated resource of over 1 million tonnes at 1.82% copper and 0.78 g/t gold. Other prospects include YC5, YC11, YC14, Augustus and A Zone. YC14 and A Zone show massive sulphide Cu-Au. A Zone which is 1.3 kilometres north of Just Desserts also contains zinc in the upper levels and copper-gold in the lower levels of the horizon. Large widths of low grade platinum-palladium has been discovered at the Constantine prospect at 0.49 g/t Pt and Pd, and 0.22% nickel. This is associated with massive sulphides in at least two horizons of a major layered mafic/ultamafic intrusive complex with a 13 kilometre strike length.

Mineral List

13 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

0 - 66 Ma

ID: 816553
calcrete 38497

Age: Cenozoic (0 - 66 Ma)

Description: Calcrete, travertine; calcareous cementing of bedrock and transported materials; pisolitic to nodular or massive; as low mounds, in playa lakes, valley calcrete, or in subsurface; may contain intercalated chalcedony; locally dissected and karstified

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, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Marston, R.J. (1979) Copper Mineralization in Western Australia. Mineral Resources Bulletin 13, Geological Survey of Western Australia, 208p. 

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