Oz, need to do more research.
Note the tantalite-columbite % in concentrate from most likely a cubic meter of rock, especially from the state of Paraiba.
Between 67% - 32% Tantalum oxide and 32.9% - 15.8% Niobium oxide in concentrate!! This is high grade, and its from crude artisanal mining.
Of course I'm not implying this is what SUM will achieve from its project, but it certainly indicates huge potential.
https://pubs.usgs.gov/of/1975/0029/report.pdf
Ann: Trading Halt, page-134
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