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Cummins Range complex (Minneroo Pool), Mount Dockrell pegmatites (Mount Dockerell), Lamboo Station, Halls Creek Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 19° 17' 12'' South , 127° 9' 45'' East
Latitude & Longitude (decimal): -19.2866666667, 127.1625


Carbonatite complex, pegmatite-like.

Rare earth oxides are the subject of this exploration. Presently (2013), China holds 95% of world supply, which has led to a worldwide scramble to find alternative supplies in case China ever restricts export of the material.

Cummins Range is 130 kilometres south west of Halls Creek in the Kimberley, and on the northern edge of the Great Sandy Desert. It is very remote desert country, with no access roads or human habitation nearby. The geologists made a note they had to cope with a plague of camels.

The Cummins Range Complex is the name for a small, 1.5km by 1.2km, alkaline intrusive complex, described as a vertical pipe-like pegmatite body. It intrudes the Olympio Formation of sediments and granite, aged 1.8Ma.

The outer zone is unaltered pyroxenite with diopside, biotite, magnetite, apatite, and carbonate, with minor baddeleyite, sphene, ilmenite, monazite, zircon, zirconolite, pyrrhotite, pyrite, and chalcopyrite.

The next zone is mica rich pale green pyroxenite, with coarse biotite-phlogopite, magnetite, carbonate, and amphibole, with minor minerals as mentioned previously as accessory minerals for the outer zone, and in addition, pyrochlore, barite, bastnäsite, aeschynite, and thorianite.

The central core is a carbonatite zone 500m x 400m of dolomite, some calcite and magnesite, and minor amphibole, biotite, magnetite, chlorite, apatite, zircon, monazite, bastnasite, aeschynite, fluorite, pyrochlore, allanite, pyrite, and pyrrhotite.

Apatite occurs as grains less than 7mm and monazite less than 2mm. Oxidation, leaching and dissolution of the carbonates has resulted in the formation of these rare earth oxides, niobium and uranium minerals.

The site has a very interesting geology, and theoretically could produce just as interesting specimens. In reality, only drill holes have happened so far, is on an active lease, and regardless would require a major expedition to retrieve them into harsh desert country with no civilisation for hundreds of kilometres.


Mineral List


17 valid minerals.

Rock Types Recorded

Entries shown in red are rocks recorded for this region.

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!



The above list 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

Berger, V.I., Singer, D.A., and Orris, G.J. (2009): Carbonatites of the World. Explored Deposits of Nb and REE - Database and Grade and Tonnage Models. USGS Open-File Report (2009):09: 1139.


Jacobson, M., Calderwood, M., Grguric, B.(2007): Pegmatites of Western Australia (2007)

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