https://www.sciencedirect.com/science/article/abs/pii/S0304386X20308689
"Pyrochlore and columbite are known as the major mineral sources for Nb. Pyrochlore contains exclusively Nb, while columbite bearing ores contain also significant amount of Ta which can be economically converted to pure metal."
Pyrochlore is a carbonatite Nb ore the same as Araxa, Columbite Nb ores are found in pegmatites and contain high Nb and lower Ta with other minerals.
Wa1 is carbontite based therefore a pyrochlore source.
Ann: West Arunta Project - Exceptional Luni Assay Results, page-245
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