Ann: RareX acquires district-scale niobium project - East Yilgarn, page-5

The guys who helped kick off WA1 first identified this, not a bad thing it would seem, .ie.

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The alkaline intrusive complex identified by REE is 20km in diameter.
Geophysics consultant Resource Potentials – who are credited with locating WA1 Resources’ (ASX:WA1) Luni geophysics that become a significant niobium discovery in the West Arunta region – identified possible ring dyke structures on the north-eastern edge of the complex and multiple circular bodies within the complex that may represent various fractionated melts.
Additionally, geochemistry provides conclusive evidence of the presence of the alkaline intrusion.
REE has already identified two obvious targets – Luchini and Niobe – for initial exploration."