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Dordie Rocks North deposit (Dordie North prospect; Dordie Rocks North), Widgiemooltha, Coolgardie Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 31° 34' 50'' South , 121° 37' 1'' East
Latitude & Longitude (decimal): -31.58083,121.61722
GeoHash:G#: qdqkr6yuq
Locality type:Deposit
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Located 11 kilometres south-east of Widgiemooltha.

Eardleyite (otherwise known as Takovite) occurs here in serpentinite as narrow fracture filling, and thin surface coatings. It is associated with glaukosphaerite, nickeloan magnesite, nickeloan glauconite, atacamite, paratacamite, malachite, azurite, chalcopyrite and lithiophorite.

Glaukosphaerite is intergrown with nickeloan celadonite in veinlets of goethite-quartz-tremolite rock.

The prospect was discovered in 1967 by Anaconda and CRA.

The ultramafic formation dips 45 degrees east, 300 metres thick, of picritic to peridotitic flow units, with increasing thickness with depth. It consists of talc, tremolite, chlorite rock, minor carbonate and serpentine. Thin phlogopite rich zones, and chlorite are abundant, with quartz-feldspar porphyry dykes. The Footwall is amphibolite.

There are two shoots, named A and B. A is larger at a length of 600 metres on the surface. It occupies an embayment at the ultramafic-Footwall contact, plunging gently south, although the dip steepens with depth.

The mineralised zone is up to 10 metres thick, but commonly 1-2 metres. Low grade disseminated ore of narrow veins, matrix to massive sulphide at or near the basal contact.

B shoot is 60 metres long, at 200 metres above A shoot, 2-4 metres thick, with a grade lower than A.

Primary mineralisation is pyrrhotite, pentlandite, minor chalcopyrite, gersdorffite, magnetite, chromite, and bismuthinite.


Mineral List


22 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: 929443
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: 3189181
Archean sedimentary rocks

Age: Archean (2500 - 3200 Ma)

Comments: Yilgarn Craton

Lithology: Sedimentary 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

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pryce, M.W., Just, J. (1974) Glaukosphaerite - a new nickel analogue of rosasite, Mineralogical Magazine (Sept-Oct 1974) Vol.39 pp.737-743.
Nickel, E.H., Charles, C.E.S., Bussell, M., Bridge, P.J., Dunn, J.G., Macdonald, R.D. (1977) Eardleyite as a Product of the Supergene Alteration of Nickel Sulphides in Western Australia, American Mineralogist (1977) 62 pp.449-457.
Marston, R.J. (1984) Nickel Mineralization in Western Australia. Mineral Resources Bulletin 14, Geological Survey of Western Australia, 291p. 

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