I think it has been mentioned that the Magpie rock has aluminum in it, which (again, I think)is not in the Argex La Blache rock. This may cause difficulties with the separation of metals & minerals.
Whether Magpie will use the exact patented Argex technology or not is less important than the fact that a very similar deposit can be economically exploited, and so there is a high probability the Magpie rock is actually useful ore.
I am sure insiders are well ahead of us little guys in knowing some of the answers about the possibility of licensing the extraction process and so on.
I dont know how much TiO2 the market can absorb, so this must be a factor that RGX must consider. Their own deposit is large, the processing plant requires capital.
I believe iron will be in demand and prices will rise over the next 10 years. That is quite far enough into the future for purposes of evaluating the deposit, although a mine could operate for far longer than that.
Remember La Blache was originally a FNC/Sheridan property, which is why FNC has shares in it and in a numbered company involved in the transaction, as well as a NSR. I don't know if La Blache was sold because it was considered less valuable or because it was more easily exploitable, and so some quick cash/share equity could be got for it.
If a favourable report comes out, with an opinion that the Magpie rock is economically useful, we can expect some considerable interest from Chinese, Korean, Japanese, and US companies