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Beaconsfield Mine (Tasmania mine), Beaconsfield, Beaconsfield district, West Tamar municipality, Tasmania, Australia

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Latitude & Longitude (WGS84): 41° 12' 7'' South , 146° 48' 55'' East
Latitude & Longitude (decimal): -41.20200,146.81529
GeoHash:G#: r28msg7su
Locality type:Mine
Köppen climate type:Cfb : Temperate oceanic climate


One of the richest gold mines in Australia, located near the centre of the town of Beaconsfield.
Gold was found in 1877 and several workings soon started on the Tasmania reef, which combined into the underground Tasmania mine in 1888. It operated until 1914, producing about 1Mt of ore at 25g/t gold, recovering 26.6 tonnes of gold. It closed largely due to a high water flow and ground problem, stopping at about 450m. The old mine buildings now house a museum, the Beaconsfield Mine & Heritage Centre.

After rehabilitating the old main shaft, the mine reopened in 2000 and finally closed in 2013, after bad ground conditions, at more than a km deep, caused a large collapse. This caused the death of one miner and entrappment of two others for two weeks, before a complex rescue operation saved them (https://en.wikipedia.org/wiki/Beaconsfield,_Tasmania). The final resource calculation was 3.6Mt @15.9g/t Au, producing 1.8 Moz Au (about 60t).

The lode is an unusually consistent quartz-dolomite+/- sulphide vein about a metre wide and plunging to at least a km deep. It is hosted in silicified Ordovician sandstone and limestone, and is of late Devonian age.


Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

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

15 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: 912649
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


Localities in this Region
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Australia
  • Tasmania
    • West Tamar municipality
      • Beaconsfield district

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)
HILLS, P.B., 1998, Tasmania gold deposit, Beaconsfield.In Berkman, D.A. and Mackenzie, D.H., eds., Geology of Australian and Papua New Guinean Mineral Deposits, p. 467–472.
KEELE, R.A., TAYLOR, B., and DAVIDSON, G.J., 1994, Relationships between Devonian thrusting and gold mineralization in northern Tasmania. Contentious Issues in Tasmanian Geology: a Symposium:Geological Society of Australia, Tasmanian Division, p. 59–60.
BOTTRILL, R.S., HUSTON, D.L., TAHERI, J., and ZAW, K., 1992, Gold in Tasmania:Bulletin of the Geological Survey of Tasmania, v. 70, p. 24–47.
Russell, D.W. and van Moort, J.C. 1999 The chemical characterisation
of auriferous vein quartz, Beaconsfield gold mine, Tasmania.
Journal Geochemical Exploration 67: 191-200.
GEE, R.D. and LEGGE, P.J., 1979, Geological Atlas 1 Mile Series. Sheet 30 (8215). Beaconsfield: Explanatory Report, Department of Mines, Tasmania, 127 p.

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