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Adamsfield, Derwent Valley municipality, Tasmania, Australia

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Latitude & Longitude (WGS84): 42° 43' 22'' South , 146° 20' 14'' East
Latitude & Longitude (decimal): -42.72292,146.33750

The site of an isolated settlement, now reclaimed by dense bush, serving the surrounding "osmiridium" field, near Lake Pedder, south-western Tasmania. It was once one of the world's major producers of this rare metal, but little can be found there now. The "osmiridium" (mixtures of Os-Ir-Ru alloys) was mostly recovered from shallow alluvial workings; the hard-rock sources in associated serpentinites are largely untested. Harris and Cabri (1991) redefined the classification of the Os-Ir-Ru alloys to the elemental end-members (iridium, osmium and ruthenium, q.v.) plus rutheniridosmine (for structural reasons).

Mineral List

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

9 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

Early Ordovician - Guzhangian
470 - 500.5 Ma
Denison Group and correlates

Age: Paleozoic (470 - 500.5 Ma)

Stratigraphic Name: Denison Group and correlates

Description: Marine to non-marine quartzose conglomerate-sandstone-siltstone sequences

Comments: sedimentary siliciclastic; synthesis of multiple published descriptions

Lithology: Sedimentary siliciclastic

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, used under Creative Commons Attribution 4.0 License

Localities in this Region


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.


Cabri L.J., & Harris, D. (1975). Zoning in OS-IR Alloys and the Relation of the Geogical and Tectonic Environment of the Source Rocks to the Bulk Pt: Pt+Ir+Os Ratio for Placers. Canadian Mineralogist, 13, 266-274.

Bottrill, R. S.; (1989), Economic Geology Appendix A; Tasmanian Geol. Surv. Explanatory Rept. 73 ( Huntley.)

Bacon, C. A. (1992). Notes on the History of Mining and Exploration at Adamsfield. Mineral Resources Tasmania.

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