I don't think 'starting from a lower % point may make it more expensive for us (KRC)'.
I wondered why TNG achieved a higher concentration grade than AVL, though the ore is lower grade.
I think the reason is that unexpensive methods mainly seperate Vanadium and Iron from the rest. Separating V from Fe is the expensive step. The important point then is the concentration of V RELATIVE to the concentration of Fe.
For example, a higher concentrate grade may be achieved with 0.5%V and 10% Fe than with 1% V and 50% Fe.
KRC - AVL Comparison, page-16
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