Shimmer, made some enquiry, answer from a geo friend is as follows, looks like nobody will direct leach, regards to all, Pirra.
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I'm not aware of anyone doing ISL on rare earths. They're just not soluble enough. If they mean, dissolving without the acid bake, then the hydrochloric acid route wasn't very good at dissolving the rare earths, nitric might be OK at holding them into solution, but you have to get them in.
In short, no i don't think anyone is doing it.
Unquote
Time will tell. Always does
resistance, page-69
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