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Lennon's Find zinc-lead-copper prospects, Mount Edgar Station, Marble Bar, East Pilbara Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 21° 21' 29'' South , 120° 13' 59'' East
Latitude & Longitude (decimal): -21.35833,120.23333
GeoHash:G#: qsjqrzz4x
Locality type:Group of Prospects
Köppen climate type:BWh : Hot deserts climate


Located 19.2 km from Mount Edgar Homestead.

The prospect is 70 kilometres east south-east from Marble Bar in the Meetheena Conservation Reserve. One source states it was discovered in 1907, another states gold was crushed at the state battery from Lennon's Find in 1904. Small scale mining took place between 1951-1960, producing 30.5 tonnes of copper ore and 20.3 tonnes of zinc ore from small pits to 7.5 metres deep.

The deposit hosts five VHMS prospects named by someone with a shark fetish over a 4 kilometre strike length. The prospects are named Hammerhead, Bronze Whaler, Grey Nurse, Mako, and Tiger.

The Lennon's Find site hosts an ore resource of 1.87mt at 82g/t silver, 0.26% g/t gold, 0.2% copper. 1.4% lead and 5.1% zinc.

The deposit is situated on the southern edge of the Mount Edgar granitoid complex, with mineralisation at the surface as gossanous pods and lenses with secondary copper carbonates which it doesn't name, in the Duffer Formation. This formation consists of basal quartzo-feldspathic fine grained quartz-muscovite-biotite feldspar schist, and lesser knotty quartz-feldspar-muscovite-biotite schist, with quartz microphenocrysts.

This is overlain by 80-150 metre thick metasedimentary unit of fine grained quartz-muscovite-chlorite schist with up to 20% andalusite porphyroblasts, and fine grained quartz-muscovite-chlorite schist. The upper most is 0.75 metres thick quartz-muscovite schist, containing gossans and massive sulphide lenses.

Foliated leucogranite intrudes the quartzo-feldspathic rocks at the base of the Duffer Formation. Mineralised late pegmatite dykes intrude the granite.

There are also five mineralised zones, in two stratigraphic horizons, 20-60 metres below the base of the Miralga Formation. The mineralisation is conformable, planar lodes continuous over hundreds of metres, dipping 45-65 degrees south-east.

Hammerhead is a thin (under 5 metres) thick lens of baritic semi massive to massive sulphide, with gossan at the surface. It dips moderately south-east, containing sphalerite, chalcopyrite, and galena, with associated barite and pyrite.

There is massive banded sulphide 25-80% with quartz, barite, chlorite, carbonate, tourmaline, muscovite and biotite gangue; thinly banded and disseminated 5-20% sulphide, mainly pyrite in 1-20 mm bands and disseminated grains; and lastly disseminated up to 2% sulphide mainly pyrite. The massive sulphide is at the top of the sequence, then thinly banded and basal disseminated. The top is Pb-Ag rich, and bottom Zn-Cu rich.




Mineral List


17 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

Paleoarchean
3200 - 3600 Ma



ID: 3191854
Archean volcanic rocks

Age: Paleoarchean (3200 - 3600 Ma)

Comments: Pilbara Craton

Lithology: 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]

Paleoarchean
3200 - 3600 Ma



ID: 883574
Salgash Subgroup

Age: Paleoarchean (3200 - 3600 Ma)

Stratigraphic Name: Salgash Subgroup

Description: Banded iron formation, shale, felsic volcaniclastics, chert, jaspilite, agglomerate, dolerite, basalt, ultramafic rocks, basaltic andesite, amphibolite, chlorite schist, felsic schist, komatiitic basalt, siliciclastic rocks; metamorphosed

Comments: sedimentary; igneous felsic volcanic; synthesis of multiple published descriptions

Lithology: Sedimentary; igneous felsic 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]

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.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Marston R.J. (1979) Copper Mineralization in Western Australia. Geological Survey of Western Australia, Mineral Resources Bulletin 13.
The Western Mail newspaper (Perth) (1904) Pilbara (08 Oct 1904).
Huston, D.L., Morant, P., Pirajno, F., Cummins, B., Baker, D., Mernagh, T.P. (2007) Paleoarchean Mineral Deposits of the Pilbara Craton: Genesis, tectonic Environment and Comparisons with Younger Deposits, Geoscience Australia, Geological Society of Australia, Moly Mines Pty Ltd, 2007.
Ferguson, K.M. (1999) Lead, Zinc and Silver Deposits of Western Australia. Geological Survey of Western Australia, Mineral Resources Bulletin 15.

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