" In addition, the insoluble residue that resulted from this step was Nb2O5 rich (41% recovery)."
Do you have a reference or a link for your 58% recovery claim??
The Itafos PEA also quite clearly states that part of the resource is under a tailings dam wall.
Pg 25....
" However, of particular note is that the current measured and indicated mineral resource is located at the base of a tailings dam wall."
In the PEA there are also a whole lot of cross sections of the planned mining from pg 59-61, showing in 3d for those who know how to read this information, exactly where all the mineralisation is. There is not going to be any massive increase in size.
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