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Lord Byron gold prospect, Irwin Hills (Jasper Hills), Menzies Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 29° 7' 29'' South , 123° 2' 42'' East
Latitude & Longitude (decimal): -29.12478,123.04506
GeoHash:G#: qdz6rcyxv
Locality type:Prospect
Köppen climate type:BWh : Hot deserts climate

The Lord Byron gold prospect is 93 kilometres south-east of Laverton, in the far north-east section of the Menzies Shire. Access is the same as that listed for the Fish Gold Mine. Lord Byron is 8 kilometres south-west of the Fish Gold Mine.

The prospect is part of the Irwin Hills Greenstone Belt. The deposit is hosted by a sequence of amphibolites, interbedded with chert and banded iron formation, dipping steeply east, trending north north-west to south south-east in the south, and north north-east to south south-west in the north of the deposit area.

This is cut by a north-west trending, east dipping shear zone called the Bicentennial Shear. Gold is found along the shear zone, and with the banded iron formation, where it intersects with the shear. The shear trends north-south and is deeply weathered. Supergene gold is variably developed, but is most extensive where the north-west trending shear intersects with the north-south zone of mineralisation, producing areas of high grade gold.

The north end of the prospect gold mineralisation is hosted in biotite-chlorite-carbonate alteration, and amphibolite. Laminated, massive, and brecciated textured quartz veins are found with chlorite, biotite, carbonate and pyrite hosting the gold. Gold is also found in pyrite in the wall rocks. The deposit shows actinolite-chlorite recrystallization, and then late sericite alteration overprints.

Mineral List

5 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

0 - 66 Ma

ID: 754667
ferruginous duricrust 38498

Age: Cenozoic (0 - 66 Ma)

Description: Ferruginous duricrust, laterite; pisolitic, nodular, vuggy; may include massive to pisolitic ferruginous subsoil, mottled clays, magnesite, reworked products of ferruginous and siliceous duricrusts, calcrete, gossan; residual ferruginous saprolite

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: 3188963
Archean intrusive rocks

Age: Archean (2500 - 3200 Ma)

Comments: Yilgarn 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. [154]

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

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Blewett, R.S., Czarnota, K, (2007), Tectnostratigraphic Architecture and Uplift History of the Eastern Yilgarn Craton, Module 3, Terrane Structures, Project y-p763, Geoscience Australia, Commonwealth of Australia, 2007

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