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Triple Chance Mine, Thackaringa district, Yancowinna Co., New South Wales, Australia

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Latitude & Longitude (WGS84): 32° 8' 53'' South , 141° 8' 23'' East
Latitude & Longitude (decimal): -32.14806,141.13972
Köppen climate type:BWk : Cold desert climate

A feldspar-muscovite-beryl mine in pegmatite, 35 km South West of Broken Hill (42km by road via the Barrier Highway and then a private road to the mine), named after the three commodities mined, by the late famous lady miner Tess Alfonsi. The pegmatite was known for large yellowish beryl crystals often reaching over a metre in length and apparently used as a source of Beryllium metal for the NASA Apollo Space Program.

An almandine deposit occurs in a biotite and hornblende schist 1.5km east, at a location named Bailey's Tank, but is not strictly part of the mine. Garnet amphibolite occurs as a country rock.

The current owners (Unimin Co.) have begun the dismantling of the processing plant and the rehabilitation of the mine site, with the dumps being contoured and covered with topsoil. The mine is expected to close completely by the end of 2012. The open cut is to be left as a water supply for Thackaringa Station and the whole area will be under very restricted access.

NOTE: In the 1990s(?), the mining lease was not renewed due to safety reasons. Since then (beryl-free) pegmatite material from quarries nearby such as The Lady Beryl and Egebek as well as those in the Olary area of South Australia has been processed here for the high quality porcelain feldspar.

Between 1998 and 2004, Almandine garnet from satellite mines such as the Lady Margaret, Bailey's Tank and Staurolite Ridge quarry was also processed onsite.

Mineral List

5 valid minerals.

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

1600 - 1800 Ma

ID: 778519
Thackaringa Group

Age: Statherian (1600 - 1800 Ma)

Stratigraphic Name: Thackaringa Group

Description: Composite gneiss, albite-rich rocks, granitic gneiss, amphibolite, minor quartz-magnetite rocks and garnet-quartz rocks.

Comments: high grade metamorphic rock; synthesis of multiple published descriptions

Lithology: High grade metamorphic rock

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]

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

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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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- Lishmund, S. R. (1982): Non-metallic and tin deposits of the Broken Hill district. Geological Survey of New South Wales Bulletin 28, Department of Mineral Resources, New South Wales, 176 pp.

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