|Latitude & Longitude (WGS84):||21° 5' 39'' South , 117° 50' 52'' East|
|Latitude & Longitude (decimal):||-21.09425,117.84796|
|Köppen climate type:||BWh : Hot deserts climate|
ML 31. Copper mine. 5 kilometres east of the Croydon homestead.
The lode strikes north-east. Very early 20th Century a great deal of rooting around at the site was conducted by the British Exploration Australasian Company. The main shaft was down to 100 feet, but when visited 1908 was full of water to 45 feet of the surface.
The deposit is a shoot of copper ore, 40 feet long, oxidised in the upper levels, in clayey material, but with plenty large bunches of copper oxides, carbonates, silicates and sulphides. A 50 tonne parcel came in at 21% copper.
The deposit also has significant zinc, which led to problems processing the ore in its early days. Zincite was in the oxidised zone, and sphalerite below the water table. The deposit is 14% zinc. Below the water table was also noted pyrite and marcasite.
A study was done of the site in 1908 by the government mineralogist, who determined chrysocolla, malachite, cuprite, a brick red type of cuprite called tile ore, much chalcocite, chalcopyrite, sphalerite, smithsonite, quartz, limonite, and large crusts and veins of calcite.
Eight shafts were on the lease, but only one was payable. Mining appears to have been limited and abandoned permanently afterwards.
13 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
|Archean intrusive rocks|
Age: Neoarchean (2500 - 2800 Ma)
Comments: Pilbara Craton
Lithology: Intrusive igneous 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. 
2500 - 4000 Ma
|metamorphosed mafic rocks 74327|
Age: Archean (2500 - 4000 Ma)
Description: Metamorphosed mafic rocks; metabasalt, metagabbro, metadolerite, amphibolite, mafic schist; minor metamorphosed ultramafic rocks and metasedimentary rocks; amphibolite schist; quartz-sericite schist, volcaniclastic rocks, local granitic dykes and veins
Comments: meta-igneous mafic; meta-igneous ultramafic; synthesis of multiple published descriptions
Lithology: Meta-igneous mafic; meta-igneous ultramafic
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).