dasgrunt, personally, i'd think that would be a real long shot ... and i believe it is safe to say that very few, if any people, put any money on such a possibility.
however, i would not want to discourage you. if you are so inclined, i suggest you check with the USGS and/or DNR (wyoming), that is, Dept Natural Resources, or geologic survey (wyoming) to see what general maps and/or documents they might have published ... regarding rare earth possibilities.
i would think that one of these entities would have done some work along these lines of investigation ... at some point in time.
personally, i'd be surprised/shocked if they did show something of commercial interest in PBR region .... but, who knows?
happy hunting.
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