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Rosebery Mine (EZ Mine), Rosebery, Rosebery district, West Coast municipality, Tasmania, Australia

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Latitude & Longitude (WGS84): 41° 46' 59'' South , 145° 31' 0'' East
Latitude & Longitude (decimal): -41.78306,145.51667
GeoHash:G#: r0x6r3dh0
Locality type:Mine
Köppen climate type:Cfb : Temperate oceanic climate


A Zn-Pb-Cu-Ag-Au VMS-type deposit on the slopes of Mt Black in western Tasmania. The deposit was discovered in 1893 but not worked on a large scale until 1936 due to the very fine grain size of the intimately combined sulphides. The underground mine is still in operation today ('MMG Rosebery Mine'), with an expected mine life of >2020. It has previously been operated by several other companies, initially EZ (Electrolytic Zinc), later Pasminco, Oz Minerals and Zinifex, recently taken over by MMG.

The mine has the capacity to produce approximately 700,000 tonnes of ore a year, which is then processed into zinc concentrate, lead concentrate, and gold and silver doré. It also produces a small amount of copper concentrate.

The ore is a volcanic-related (Mt. Read volcanics), sediment-hosted, pyrite-rich massive sulphide, with numerous discrete orebodies, but no gossans. There has been some overprinting by Devonian granites, related to an underlying granite intrusion. This has resulted in some unusual mineralisatio zones, including magnetite, biotite, spessartine, danalite, rhodonite, etc.

Mineralogically, it is best known for its vein minerals, mostly barite and other barium minerals, plus rhodochrosite and boulangerite.



Commodity List

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


Mineral List


56 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

Ordovician
443.8 - 485.4 Ma



ID: 3186041
Paleozoic sedimentary rocks

Age: Ordovician (443.8 - 485.4 Ma)

Lithology: Limestone,sandstone,slate,quartzite,conglomerate

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]

Early Ordovician - Guzhangian
470 - 500.5 Ma



ID: 926432
Denison Group and correlates

Age: Paleozoic (470 - 500.5 Ma)

Stratigraphic Name: Denison Group

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 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.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Brathwaite, R. L. (1969). The geology of the Rosebery ore deposit (Doctoral dissertation, University of Tasmania).
Lees, T.C., Khin Zaw, Large, R.R. and Huston, D.L., (1990): Rosebery and Hercules copper-lead-zinc deposits. In: Geology of the mineral deposits of Australia and Papua New Guinea. Australasian Institute of Mining and Metallurgy, Melbourne. 1241-1247.
Khin Zaw, (1992). The effect of Devonian metamorphism and metasomatism on the Cambrian VMS deposits in the Rosebery - Hercules district, W. Tasmania. PhD Thesis [unpub.], Univ. Tasm.
Khin Zaw, R.R. Large and D.L. Huston, (1997). Petrological and geochemical significance of a Devonian replacement zone in the Cambrian Rosebery massive sulfide deposit, western Tasmania. Canadian Mineralogist 35, p. 1325-1349
Berry, M.V., Edwards, P.W., Georgi, H.T., Graves. C.C., Carnie, C.W.A., Fare, R.J., Hale, C.T., Helm, S.W., Hobby, D.J. and Willis, R.D., (1998): Rosebery lead-zinc-gold-silver-copper deposit. In: Berkman, D.A., and Mackenzie, D.H., (eds.): Geology of Australian and Papua New Guinean Mineral Deposits. Monograph 22. Australasian Institute of Mining and Metallurgy, Melbourne. 481-486.
Large, RR and Allen, RL and Blake, MD and Herrmann, W (2001): Hydrothermal Alteration and Volatile Element Halos for the Rosebery K Lens Volcanic-Hosted Massive Sulfide Deposit, Western Tasmania. Economic Geology, 96, 1055-1072.
Bottrill, R. S. & Baker, W. E. (2008): A Catalogue of the Minerals of Tasmania. Geological Survey Bulletin 73, Mineral Resources Tasmania
Huston, D. L. and R. R. Large, 1988. Distribution, mineralogy and geochemistry of gold and silver in the north end orebody, Rosebery, Tasmania. Economic Geology 83: 1181-1192.

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