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Mount Weld Mine, Mount Weld Station, Laverton Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 28° 51' 36'' South , 122° 32' 52'' East
Latitude & Longitude (decimal): -28.86000,122.54778

Carbonatitic REE deposit with additional Nb, Ta, Zr, Ti contents ('Crown deposit' - apparently a separate part of the carbonatite).
Discovered in 1988; owned by Lynas Corp.

Located about 30 km south of Laverton and 120 km east of Leonora.

Rare earths are contained in secondary phosphates and aluminophosphates, presumably derived from weathering of the Proterozoic Mount Weld carbonatite, an intrusive pipe approximately three kilometers in diameter.

One of the references describes churchite as a fragile secondary mineral of microcrystalline acicular radiating crystals. It is found as void filling in crandallite group minerals, and as encrustations on limonite aggregates, weathered magnetite, on crandallite group grains, and sometimes as fine grained intergrowths with limonite

Mineral List

9 valid minerals. 1 erroneous literature entry.

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.

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0 - 2.588 Ma
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]

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

This page contains all mineral locality references listed on 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 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.


Lottermoser, B. G.; England, B. M. (1988): Compositional Variation in Pyrochlores from the Mt. Weld Carbonatite Laterite, Western Australia. Mineralogy and Petrology (1988): 38: 37-51. [Na-Ca-pyrochlore, strontian pyrochlore, strontiopyrochlore, ceriopyrochlore, cerian strontiopyrochlore, and strontian ceriopyrochlore]

Lottermoser, B. (1990): Rare-earth Element Mineralisation Within the Mt. Weld Carbonatite Laterite, Western Australia. Lithos (1990):24: 151–167.

Lottermoser, B.(1987):Churchite from the Mt Weld Carbonatite Laterite Western Australia, Mineralogical Magazine(1987):51: 468-469

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