Bungalow prospect, Cowell, Eyre Peninsula, South Australia, Australia
|Latitude & Longitude (WGS84):||33° 35' 42'' South , 136° 53' 17'' East|
|Latitude & Longitude (decimal):||-33.59500,136.88806|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
This is one of several localities on the Eyre Peninsula Centrex Metals propose as being a 'possible mine' in the future. At this time (April 2011) it is still only part of their pospectus. M.Willoughby.
Located 9 km NNW of Cowell.
Bungalow prospect,recognised by its prominent aeromagnetic anomaly, and investigated in the late 1950's by ground geophysical surveys and drilling by SADME. The magnetic anomaly was a double peak of 5-14 000 nT, 9 km strike length, and over 600 m wide. Cover thickness of younger sediment was 15-35 m, thickening to the south. It was drill tested in cross-section by five drill holes (Bungalow BD1-3, 4 & 6). BD2 intersected banded iron formation (BIF), grading from dominantly quartz-cummingtonite-magnetite to magnetite-talc to quartz-magnetite. The volume percent of magnetite was similar to that found in the Middleback Range. Best assays BD2, 15 m @ 29.4% Fe, 9 m @ 39.6% Fe. More recent exploration included low-level aeromagnetics, gravity, diamond drilling with geochemistry and Davis Tube test work. The magnetics were resolved into a number of narrow, elongate, high amplitude anomalies. Drilling carried out on 2 sections confirmed a folded BIF band of true width ~36 m. Cover depth varied from 20-75 m, lateritic weathering 30-90 m below ground level. Best magnetite-bearing BIF occurred in a micro- to mesobanded magnetite-bearing BIF, typically as magnetite-rich bands alternating with quartz, iron-rich silicates and carbonate. Generally the magnetite was quite fine grained with a significant proportion <75 microns. A global weighted average grade was 38.02% DTR (Davis Tube Recovery) at 67.66% Fe and 5.37% SiO2. Total resource May 2012 at 239Mt at 30.7%Fe head grade, 35.2DTR% at 38 micron grind for product at 69.8%Fe. Revised exploration target in the order of 500-750Mt, based on results to 2010, and new aeromagnetics. Age dating of interbanded, biotite-garnet-sillimanite schist (metasediment) appears to indicate that the iron formation was deposited some time after ca. 2555 Ma and may therefore be correlative of the iron formations in the Middleback Range itself, with recent maximum depositional ages for schist in the Middleback Range being ca. 2565 Ma. Granites, including garnet-bearing S-type leucosomes were emplaced into the Bungalow iron formation-bearing sedimentary sequence at ca. 1730 Ma, likely during the early phase of the Kimban Orogeny. One of these granites has inherited zircons as old as ca. 3445 Ma.
4 valid minerals.
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 - 66 Ma
|sand plain 38499|
Age: Cenozoic (0 - 66 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). 
1600 - 2500 Ma
|Paleoproterozoic intrusive rocks|
Age: Proterozoic (1600 - 2500 Ma)
Comments: Gawler 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.