RE:NSRI doubt there's any way Dino would give up TUO's royalty on TC, and there is no buy-back provision so he can never be forced to do so. AMK sold a portion on their NSR on TC to some anonymous investors so I would suspect it's their share of the NSR or what was left of AMK's share that TUD purchased. Not sure, just my speculation. There's a statement about AMK's dealings with the anonymous investors in their last MD&A that investors might find worthwhile reviewing.
.................. BB