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Meentheena fluorite deposit, Ripon Hills District, East Pilbara Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 21° 14' 16'' South , 120° 28' 14'' East
Latitude & Longitude (decimal): -21.23797,120.47082
GeoHash:G#: qsjxjmspv
Locality type:Deposit
Köppen climate type:BWh : Hot deserts climate

Located approximately 70 kilometres east south-east of Marble Bar, and 6 kilometres north north-east of the abandoned Meentheena homestead. Discovered 1971. One of the largest fluorite deposits in Western Australia, estimated at 13 000 tonnes 50% CaF2.

The fluorite deposit is hosted in the upper part of the Mount Roe Basalt, in amygdaloidal basalt, where the fluorite has formed veins and fissures forming eight separate occurrences. Conjugate veins are found up to 5 metres wide, and strike for 200 metres (1.6 kilometres in another source), over a 4 square kilometre area, occurring in two clusters, 0.5 kilometres apart, straddling the Nullagine River, 2 kilometres south of the Tumbianna Pool.

The veins show an outer quartz zone, and a wide central zone of interlayered quartz with coarse grained massive and locally banded, anhedral, white, pale brown and purple fluorite. Fluorite zones within the veins tend to pinch and swell. Sometimes the fluorite is found with galena, malachite, brochantite and atacamite. Thick veins of calcite are found at the edges of the mineralized areas. As is typical of fluorite in Western Australia, only massive material appears to be present, although in relatively large quantities.

Mineral List

8 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

2500 - 2800 Ma

ID: 3186668
Archean sedimentary and volcanic rocks

Age: Neoarchean (2500 - 2800 Ma)

Stratigraphic Name: Fortescue Group

Comments: Pilbara Craton

Lithology: Mafic volcanic rocks; shale

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]

2500 - 2800 Ma

ID: 832849
Mount Roe Basalt

Age: Neoarchean (2500 - 2800 Ma)

Stratigraphic Name: Mount Roe Basalt

Description: Massive, porphyritic, vesicular, amygdaloidal and doleritic basalt; some high-Mg basalt, agglomerate, volcanic breccia, tuff, mafic wacke, shale, polymictic conglomerate and sandstone, siliceous limestone and dolomite.

Comments: igneous mafic volcanic; synthesis of multiple published descriptions

Lithology: Igneous mafic 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

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Fetherston, J.M., Stocklmayer, S., Stocklmayer, V.C.(2013): Gemstones of Western Australia -mineral resources bulletin 25, Geological Survey of Western Australia (2013): 192
Marshall, A.E. (2000), Low-Temperature Low-Pressure (Epithermal) Vein Deposits of the North Pilbara Granite Greenstone Terrane Western Australia, AGSO, Commonwealth of Australia, AGSO Record 2000/1, 2000

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