Lady Irene Gold Mine, Menzies, Menzies Shire, Western Australia, Australia
Latitude & Longitude (WGS84): | 29° 37' 58'' South , 120° 57' 54'' East |
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Latitude & Longitude (decimal): | -29.63279,120.96509 |
GeoHash: | G#: qdwp2ts06 |
Locality type: | Mine |
Köppen climate type: | BWh : Hot deserts climate |
The Lady Irene Gold Mine is two small abandoned open pits, 9 kilometres north-west of Menzies, and 3 kilometres north of the Menzies-Sandstone Road.
The recent open pit production extracted 42 721 tonnes of ore at 4.77 g/t yielding 6552 ounces of gold. There is a remaining resource of 944 000 tonnes at 3.82 g/t yielding 11 610 ounces.
The deposit was discovered by Julia Mines Limited in 1998, and an open pit was developed in 2001.
The site contains two south plunging shoots on the contact between steep west dipping komatiite, and a high Mg basalt. This sheared contact is marked by a 1 to 5 metre thick quartz vein, with gold associated with the Footwall vein alteration.
The upper levels from the surface to 30 metres contains a high grade supergene zone 10 to 12 metres wide. Between 50 to 70 metres below the surface is a marked zone of gold depletion. Gold grades increase again below 80 metres, with the main ore shoot 80 metres in length and open at depth below 150 metres.
The two pits reach a depth of 36 metres, and ore was processed late 2002 at the Sons of Gwalia plant Leonora
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
2 valid minerals.
Rock Types Recorded
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Alphabetical List Tree DiagramRegional 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
Archean 2500 - 4000 Ma ID: 702278 | ultramafic and minor mafic rocks 74475 Age: Archean (2500 - 4000 Ma) Description: Tremolite-chlorite-talc amphibolite, metapyroxenite, pyroxenite, peridotite, serpentinite, ultramafic schists, komatiite, high-Mg basalt; also chalcedony, silica, jasper, silcrete, silica cap rock on ultramafic rocks Comments: igneous ultramafic intrusive; meta-igneous ultramafic volcanic; synthesis of multiple published descriptions Lithology: Igneous ultramafic intrusive; meta-igneous ultramafic volcanic 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: 3187518 | Archean volcanic rocks Age: Archean (2500 - 3200 Ma) Comments: Yilgarn Craton Lithology: Greenstone belt; mafic-ultramafic volcanic 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] |
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