Ann: Multiple, Large Scale REE-Nb-Ti-P Carbonatites, page-39

Hi @Cpago55 yep that's right, I read it the same...it absolutely still needs the assays for grade determination.
The pXRF sample results have not been disclosed, its only being used in the sense of saying these intervals meet a certain threshold defined by the pXRF.

"Mineralised intervals as confirmed by an infield preliminary pXRF analysis (correlation with laboratory assays currently unknown and should be treated with caution) at least 5m of >0.2% TREO, >0.1% Nb2O5, >4% TiO2, >3% P2O5."

So its being used in the sense of saying these zones are mineralised, but to what extent...wait and see. Clearly they will have a much better indication based on the actual pXRF numbers, but i respect the decision to keep a lid on things and wait for verified lab results.

Re the confidence and correlation of pXRF for individual elements, that's a topic that is not easily covered in a quick post...it depends on many factors, element weight, grainsize, homogenization, excitation source, detector type, read time, interfering elements etc
But I would say previous use of the pXRF (when they did release the results) correlated well with the assay values from lab, but given they are not providing numbers here - there isn't much point guessing. They are using a Olympus Vanta M Series - one of the best available, Nb detection limit down to about 5ppm, and Ti down around 25ppm. So detection limits on the pXRF are not an issue for the thresholds that they described....imo