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West Jordan deposit, Lake Way Station, Wiluna Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 27° 1' 5'' South , 120° 26' 15'' East
Latitude & Longitude (decimal): -27.01806,120.43750
GeoHash:G#: qejwk9ebm
Locality type:Deposit
Köppen climate type:BWh : Hot deserts climate


Large tonnage, low-grade (av. 0.58% Ni) disseminated nickel sulphide deposit, hosted in a serpentinised ultramafic body. Defined by drilling over the period 2009-2012.


The West Jordan nickel prospect is located approximately 55 kilometres south south-east of Wiluna, between the Honeymoon Well nickel complex and the Mt Keith mine in the northern Agnew-Wiluna Greenstone Belt.

The deposit is found in the core of a large dunite body, as disseminated blebs containing pyrrhotite, heazlewoodite, and locally native nickel, sphalerite and chalcocite. It is deeply weathered, and shows hypergene alteration of the host ultramafic rocks. This was by retrograde metamorphic fluids, resulting in extensive serpentisation as well as locally structurally controlled late magnesite alteration.

The description of the West Jordan prospect is the result of an analysis of twelve diamond drill cores. Eight are detailed in the reference. Three are of mineralised mesocumulate peridotite, showing an alteration assemblage of lizardite-brucite-iowaite with stichtite (purple) or woodallite replacing former magmatic chromites. Two of these show grey-white cross-cutting vein of intergrown brucite and iowaite. The fourth shows un-mineralised adcumulate dunite altered to an antigorite-magnesite assemblage. Two drill cores show brown bastile, another magmatic gabbro with ilmenite pseudomorphed by fawn coloured leucoxene. The last drill core shows a sharp contact between talc-magnesite and antigorite-magnesite altered assemblages in the un-mineralised adcumulate dunite.

The reference also contains eight reflected light photomicrographs of sulphide blebs. These show pentlandite, magnetite and minor trohilinite-vallerite series. Pentlandite with magnetite corona and cross-bars replaced by iowaite. Intergrown pentlandite and heazlewoodite with partial magnetite rims and inclusions. Intergrown heazlewoodite and native nickel and associated nickeloan magnetite. Native nickel and lesser heazlewoodite and nickeloan magnetite. Transition zone assemblage of microfaulted and porous secondary violarite overgrown with rims of secondary nickeloan pyrite associated with minor magnetite. Heazlewoodite surrounded by magnetite and chalcocite rimming the heazlewoodite from the Cu enriched zone. Intergrown pentlandite and magnetite with sphalerite partially replacing pentlandite from the Zn enriched zone.





Mineral List


28 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

Quaternary
0 - 2.588 Ma



ID: 930234
colluvium 38491

Age: Pleistocene (0 - 2.588 Ma)

Description: Colluvium and/or residual deposits, sheetwash, talus, scree; boulder, gravel, sand; may include minor alluvial or sand plain deposits, local calcrete and reworked laterite

Comments: regolith; synthesis of multiple published descriptions

Lithology: Regolith

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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Grguric, B.A., Seat, Z., Karpuzov, A.A., Simonov, O.N. (2013) The West Jordan deposit, a newly-discovered type 2 dunite-hosted nickel sulphide system in the northern Agnew-Wiluna belt, Western Australia, Ore Geology Reviews, 51, pp. 79-92.

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