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Six Mile Ni deposit, Yakabindie Station (Kathleen), Leonora Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 27° 25' 19'' South , 120° 34' 9'' East
Latitude & Longitude (decimal): -27.42222,120.56944
GeoHash:G#: qejezxgvz
Locality type:Deposit
Köppen climate type:BWh : Hot deserts climate


Located 7 km south south east of Mount Falconer.


40 kilometres south of the Mt Keith Mine, between Mt Keith and Leinster, east of the Goldfields Highway. Dominion Mining was planning to start an open pit here in the late 1980's, however it was opposed by local indigenous groups due to the likely destruction of sacred sites. The Yakabindie nickel prospects are now (2013) part of BHP Billiton's Mt Keith operations, but no mining has taken place.

The Six Mile Deposit is the largest of several nickel prospects in the area, with a relatively low grade Ni, and complex geology.

The Six Mile lens is south plunging, dips almost vertically west, and shows nickel grades at 0.6% and copper at 0.01%. Its western contact is conformable with the overlying westerly dipping meta-sediments, while the eastern contact is partly intrusive and partly faulted. Supergene alteration occurs to 150 metres, and the oxidised zone is 30 to 80 metres thick.

The Six Mile Deposit lens is 1400 x 200 metres as a north-south elongated serpentinised dunite-olivine core, surrounded by a further 100 metre wide envelope.

The dunite-olivinite core hosts most of the mineralisation, and has almost completely been serpentinized to lizardite and antigorite, with only minor fresh olivine left. There are also in this, zoned chromite grains rimmed with magnetite. There is a zone 50 to 100 metres wide running the full length of the dunite core and into the peridotite rocks to the north of pentlandite and pyrrhotite, with minor pyrite and chalcopyrite, interstitial to the olivine pseudomorphs. Where the sulphides are poorly developed, millerite, heazlewoodite and godlevskite is found.

Around the lens is an envelope containing lizardite or antigorite, with minor brucite, tremolite, talc, magnesite, and chromite. There is also a narrow, 850 x 25 metre, zone of mineralisation in the western part of the envelope, containing pentlandite and pyyrhotite, with minor niccolite, maucherite, cobaltite, and pyrite, all mainly in carbonate veinlets forming networks in the southern portion, and ragged blebs of pentlandite and pyrrhotite in peridotite in the northern portion.

The deposit is in the Agnew-Wiluna Greenstone Belt. Six Mile Deposit is at the northern end of a series of linked Ni pods, such as Goliath North and Sheba amongst others. The sequence of rocks units at Six Mile from the highest is as follows:
1. Jones Creek Conglomerate of granitoid/feldspar conglomerate, mafic conglomerate, and ultramafic para-schist.
2. a sedimentary geologic break
3. Serp Hill meta-peridotite, 100 metres thick of serpentinised olivine peridotite with cumulus textures.
4. Cherty meta-sediment marker horizon a few metres thick.
5. A layered series 600-800 metres thick, of basaltitic to ultramafic flows and intrusive rocks, interlayered with meta-basalt and meta-gabbro to pyroxenite in the upper layers, and magnesian meta-basalt and spinifex textured ultramafic flows in the lower part.
6. Cherty meta-sediment marker horizon a few metres thick.
7. dunitic lenses 300-500 metres thick of serpentinized black dunite-olivine grading to dark green-grey olivine peridotite, with disseminated nickel sulphides in some of the lenses.
8. Volcanogenic meta-sediments, 500-700 metres thick, of poorly bedded quartz, actinolite, garnet, biotite, chlorite and andesine bearing rocks, some pyroclastic in origin, and some cherty and slaty horizons.
9. Cherty meta-sediment marker horizon a few metres thick.
10. Meta-basalt: up to 500 metres thick of tholeiitic meta-basalt with some lenses of magnesian meta-basalt near the top.


Mineral List


21 valid minerals.

Rock Types Recorded

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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

Archean
2500 - 4000 Ma



ID: 907211
ultramafic and minor mafic rocks 74475

Age: Archean (2500 - 4000 Ma)

Description: Tremolite-chlorite-talc amphibolite, metapyroxenite, pyroxenite, peridotite, serpentinite, ultramafic schists, komatiite, high-Mg basalt; also chalcedony, silica, jasper, silcrete, silica cap rock on ultramafic rocks

Comments: igneous ultramafic intrusive; meta-igneous ultramafic volcanic; synthesis of multiple published descriptions

Lithology: Igneous ultramafic intrusive; meta-igneous ultramafic 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). [5]

Neoarchean - Mesoarchean
2500 - 3200 Ma



ID: 3188638
Archean volcanic and intrusive 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]

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



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References

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Barnes, S.J.(2007): Cotectic Precipitation of Olivine and Sulfide Liquid from Komatiite Magma and the Origin of Komatiite Hosted Disseminated Nickel Sulfide Mineralisation at Mt Keith and Yakabindie Western Australia, Economic Geology (2007):102(2): 299-304
Marston, R.J.(1984): Nickel Mineralisation in Western Australia, Geological Survey of Western Australia (1984)

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