Ah, the Grenville. We had a 4th yr Uni field course there and I haven't been back since, at least to look at rocks. I recall a lot of beers consumed, a pickled egg eating contest, and a hellacious bus ride to Sudbury. I don't think I've ever seen xenotime. Haven't done much REE work though. Dateline are already using a cut-off of 0.25. Maybe if they lower it to zero they'll get a billion ounces? Nah, probably not...
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