I'd agree with the idea that a buyout doesn't haven't to be an all-cash deal. Warrants and options aside, for a resource of this magnitude, net smelter royalties are a way to keep investors in the game. NSR is also a bit of insurance against a situation like Aurelian investors saw (I don't know the whole story there, just what's been circulating post-Kinross http://www.mineweb.com/mineweb/view/mineweb/en/page34?oid=61653&sn=Detail) - where the initial resource estimates - as good as they were - may have actually been low.
Like others have said before - it's certainly a nice problem to have.