Cheers Naydoe. Thorium (and uranium) content certainly seems to be a consideration, but do you have a source for it? The Mt Weld paper I linked detailing the flaws in the mineralogy doesn't seem to make any mention of it, and for some crude estimates, this Lynas release quotes .05% thorium, at least for the rare earth ores, and this old Araxa paper quotes 2-3% thorium (!) in the niobium ore, all the way through to the leached concentrate, and then seemingly removed as slag, along with the uranium, in the final ferroniobium synthesis..
Cheers Naydoe. Thorium (and uranium) content certainly seems to...
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