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Ora Banda PGE, Ora Banda Goldfield, Kalgoorlie-Boulder Shire, Western Australia, Australiai
Regional Level Types
Ora Banda PGE- not defined -
Ora Banda GoldfieldOre Field
Kalgoorlie-Boulder ShireShire
Western AustraliaState
AustraliaCountry

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Latitude & Longitude (WGS84): 30° 23' 59'' South , 121° 3' 29'' East
Latitude & Longitude (decimal): -30.40000,121.05833
GeoHash:G#: qdw549zgp
Köppen climate type:BSh : Hot semi-arid (steppe) climate


A wide arc of sub-economic PGE exists from one kilometre south of Ora Banda to the Mount Carnage area, about 12 kilometres west of Ora Banda.

The deposits were discovered by Carbine Gold NL across 1987 to 1990. It represents concentrations of PGE in laterite duricrust developed on pyroxenites, with some localised concentrations deeper in the regolith.

It is centred on the Ora Banda Sill, 2 kilometres thick, a high Mg mafic-ultramafic intrusive, with six lithological units. The pyroxenite and peridotite duricrust and regolith contains various coloured clays and saprolite, Fe nodules and pisoliths, gravelly calcareous soils, some moss agate, non calaceous red earth, and abundant silica and/or magnetite lower down.

Fresh pyroxenite has a broad zone of sulphide PGE and associated Cu enrichment (ie. chalcopyrite), with a relatively uniform distribution. There is a PGE enriched unit in the saprolite, close to the top of the peridotite, possibly the primary mineral layer. There is abundant PGE and Cu in the regolith, with increased PGE concentration in the lateritic residuum over the pyroxenite.

In the Mount Carnage area, platinum and palladium occur at 1600-1950 ppb, 2 to 8 metres thick. There are lesser amounts of Ru and Rh, with minor Os and Ir. Some enriched zones transgress the regolith horizons, the zones dipping gently south.

Pt is hosted by hematite, and some Pd by Al rich goethite. This may reflect Pt being easily weathered, leading to an early release and incorporation into hematite. Pd is more stable, incorporated into later minerals like Al rich goethite.

Due to the extensive and diffuse nature of the deposit, the Mindat co-ordinates show the southern extent of the arc only. There is no outcrop, or mine, the large pit to the north the Gimlet South Gold Mine.

Regions containing this locality

Australian Plate (Australia Plate)Tectonic Plate
West Australian Element, Western Australia, AustraliaCraton
Yilgarn Craton, Western Australia, AustraliaCraton
Kambalda Nickel Metallogenic Province, Western Australia, AustraliaGeologic Province

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


11 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Chalcopyrite
Formula: CuFeS2
Goethite
Formula: α-Fe3+O(OH)
Hematite
Formula: Fe2O3
Iridium
Formula: (Ir,Os,Ru)
Magnetite
Formula: Fe2+Fe3+2O4
Osmium
Formula: (Os,Ir,Ru)
Palladium
Formula: (Pd,Pt)
Platinum
Formula: Pt
Quartz
Formula: SiO2
Quartz var: Agate
Quartz var: Chalcedony
Formula: SiO2
Rhodium
Formula: (Rh,Pt)
Ruthenium
Formula: (Ru,Ir)

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Iridium1.AF.10(Ir,Os,Ru)
Osmium1.AF.05(Os,Ir,Ru)
Palladium1.AF.10(Pd,Pt)
Platinum1.AF.10Pt
Rhodium1.AF.10(Rh,Pt)
Ruthenium1.AF.05(Ru,Ir)
Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
var: Agate4.DA.05SiO2
var: Chalcedony4.DA.05SiO2

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Platinum Group Metals and Alloys
Iridium1.2.1.2(Ir,Os,Ru)
Osmium1.2.2.1(Os,Ir,Ru)
Palladium1.2.1.4(Pd,Pt)
Platinum1.2.1.1Pt
Rhodium1.2.1.3(Rh,Pt)
Ruthenium1.2.2.2(Ru,Ir)
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
var: Agate-SiO2
var: Chalcedony-SiO2

List of minerals for each chemical element

HHydrogen
H Goethiteα-Fe3+O(OH)
OOxygen
O HematiteFe2O3
O MagnetiteFe2+Fe23+O4
O Goethiteα-Fe3+O(OH)
O QuartzSiO2
O Quartz (var: Chalcedony)SiO2
SiSilicon
Si QuartzSiO2
Si Quartz (var: Chalcedony)SiO2
SSulfur
S ChalcopyriteCuFeS2
FeIron
Fe HematiteFe2O3
Fe MagnetiteFe2+Fe23+O4
Fe ChalcopyriteCuFeS2
Fe Goethiteα-Fe3+O(OH)
CuCopper
Cu ChalcopyriteCuFeS2
RuRuthenium
Ru Ruthenium(Ru,Ir)
RhRhodium
Rh Rhodium(Rh,Pt)
PdPalladium
Pd Palladium(Pd,Pt)
OsOsmium
Os Osmium(Os,Ir,Ru)
IrIridium
Ir Iridium(Ir,Os,Ru)
PtPlatinum
Pt PlatinumPt

Regional Geology

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

Neoarchean - Mesoarchean
2500 - 3200 Ma



ID: 3187518
Archean volcanic rocks

Age: Archean (2500 - 3200 Ma)

Comments: Yilgarn Craton

Lithology: Greenstone belt; 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. [154]

Archean
2500 - 4000 Ma



ID: 698916
mafic intrusive rocks 74263

Age: Archean (2500 - 4000 Ma)

Description: Mafic intrusive rocks, medium to coarse-grained; layered mafic to ultramafic intrusions - dolerite, gabbro, olivine gabbro, peridotite, pyroxenite, leucogabbro, quartz dolerite, quartz gabbro, gabbronorite

Comments: igneous mafic intrusive; synthesis of multiple published descriptions

Lithology: Igneous mafic intrusive

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). [5]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Butt, C.R.M., Robertson, I.D.M. (2003), Ora Banda Sill Platinum Prospect, CRC LEME, 2003


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