|Latitude & Longitude (WGS84):||21° 14' 4'' South , 119° 43' 36'' East|
|Latitude & Longitude (decimal):||-21.23438,119.72680|
|Köppen climate type:||BWh : Hot deserts climate|
Located 7 kilometres south of Marble Bar. Gold was discovered here in 1936 by Tommy Starr, and was mined till 1955. The old processing plant makes an impressive sight, its 75 metres smokestack the highest in the southern hemisphere. The old mine managers house has been converted into a small mineral museum, generously financed by a local mining company. The plant can only be seen from the road, and the many tunnels through the mountain are out of bounds as its now the home of the rare Pilbara Ghost Bat.
The shearing of the beds at Comet has allowed fluid access, and the rock chemistry reacted with the fluids leading to gold deposition. Ore is found in a north-west striking talc-chlorite-carbonate schist on an anticlinal fold nose. The surrounding rocks is un-sheared basalt and pillow basalt.
Mineralisation is found specifically in a south-west striking 2 metre wide shear alteration zone of chlorite-fuchsite-carbonate rock, impregnated by fine pyrite, and traversed by small quartz-carbonate veins. These mineralised zones in the talc-chlorite schist also contain hematite and quartz.
Gold is found where the plunging ore body intersects with a series of fractures, which strike west south-west and dip south south-east 70 degrees.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
7 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 - 2800 Ma
|Mount Roe Basalt|
Age: Neoarchean (2500 - 2800 Ma)
Stratigraphic Name: Mount Roe Basalt
Description: Massive, porphyritic, vesicular, amygdaloidal and doleritic basalt; some high-Mg basalt, agglomerate, volcanic breccia, tuff, mafic wacke, shale, polymictic conglomerate and sandstone, siliceous limestone and dolomite.
Comments: igneous mafic volcanic; synthesis of multiple published descriptions
Lithology: Igneous mafic 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). 
3200 - 3600 Ma
|Archean volcanic rocks|
Age: Paleoarchean (3200 - 3600 Ma)
Comments: Pilbara Craton
Lithology: 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.