Agree with you on averages. I prefer to just look at the individual payable REE's Nd Pr Dy and Tb (and to a lesser extent La/Ce). The other 9 REE are worthless, industry experts claim you don't even get payables on them in MREC currently. From Australian REE expert Gavin Beer, full presentation for anyone interested in REE clay processing:
ALTA-2023-UREE-PP-Met-Chem-Consulting (1).pdf
In any case, would you agree a oxide value weighted average is best practice? Recovery weighted for both oxide pricing and MRE grade to give an overall MREE number? The way MEI does their MREE extraction is heavily weighted to NdPr as the contribution of NdPr to the MREE grade is 5-10x DyTb.
Ann: Outstanding Ionic Clay Recoveries for Caldeira REE Project, page-40
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