|Latitude & Longitude (WGS84):||28° 51' 7'' South , 122° 18' 6'' East|
|Latitude & Longitude (decimal):||-28.85189,122.30176|
|Köppen climate type:||BWh : Hot deserts climate|
Open-pit gold mine.
Operated by Barrick Ltd.
The Granny Smith gold deposit was discovered by Ray Smith in 1979. An open pit was developed and processing plant erected. Once the Granny Smith Mine was abandoned, other nearby ore-bodies were developed to feed the processing plant. Wallaby is 23 kilometres south of Laverton, 11 kilometres west of Granny Smith, on the eastern edge of the Lake Carey saltpan. Just-in-Case is the southern extension of the mine. These started as an open-pit but this ceased in 2006, and has continued as an underground operation.
The mine lies in the Laverton Tectonic Zone, of major north-south shears and associated faults. Gold is associated with structurally controlled dilatant sites on a major north north-west trending, easterly dipping, brittle-ductile shear zone.
At Wallaby/Just-in-Case there are three lodes, which are sub-horizontal to flat, south-east dipping, and sub-parrallel. The ore body has a 400 metres strike length, and at least a 600 metres down dip. The main lode is surrounded by numerous less continuous sub-parrallel and cross link zones. There are two granitic intrusions in the mineralised zone. Gold is also found here where they are cut by the lodes, although it is disseminated and a lower grade. The ore zone is hosted by a 1200 metre series of Archaean matrix supported polymict conglomerates. This is covered by 15 to 70 metres of lake sediments.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
29 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
0 - 2.588 Ma
|lunette dunes 72955|
Age: Pleistocene (0 - 2.588 Ma)
Comments: regolith; synthesis of multiple published descriptions
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 and intrusive 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.