|Latitude & Longitude (WGS84):||30° 57' 46'' South , 121° 14' 47'' East|
|Latitude & Longitude (decimal):||-30.96278,121.24639|
|Köppen climate type:||BSh : Hot semi-arid (steppe) climate|
Small, abandoned, open cut gold mine located 8 km SE of Coolgardie, in the Eastern Goldfields of WA (active from the 1890s until "fairly recently").
The gold was worked in quartz lodes in metamafic greenstones of the Yilgarn Province but some pegmatite veins also occur.
Around 1974, 'danalite-helvite' was discovered in a 0.3 to 1 metre thick pegmatite vein at this gold mine, and specimens have also been found on the huge mullock hill. EDS analysis by Excalibur Minerals has shown the material to be helvite, but many still refer to it as danalite-helvite, in reference to the original uncertainty when it was discovered.
SEM-EDAX characterisation of crystals taken from a vugh opened in 2007 by Grguric and Downes (2009) showed all to be the helvite end-member, leading these authors to a more comprehensive examination of helvite-group minerals from the locality in the W.A. Museum collection. Twelve samples were analysed and all proved to be helvite with variable Fe (3 to 29 mol%) and Zn (0.4 to 15 mol%) substituting for Mn. The occurrence of danalite at the locality is now considered doubtful.
The mine lies on the eastern extension of the Tindal's cross fold axis, in shear zones in the Hampton Ultramafic Belt. The ultramafics are metamorphosed interbedded mafic lavas, ultramafic rocks and schists, mafic intrusives, and sediments, all intruded by porphyry and alaskite (leucogranite) dykes. Gold is found in the shear zones, in ultramafics, close to the porphyry dykes. Some gold is also found in hybridised siliceous lodes, in folded and jointed porphyries, and mafic/ultramafic contacts.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
17 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
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
2500 - 4000 Ma
|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). 
|Neoarchean - Mesoarchean|
2500 - 3200 Ma
|Archean volcanic rocks|
Age: Archean (2500 - 3200 Ma)
Comments: Yilgarn Craton
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.