In Denmark we feel the US is trying to kick in an open door, the only thing I can think of RE mineral rights is that we probably have stricter environmental protection laws than the US.
But overall it's not economical to mine in Greenland, the Greenland government has been desperate for investments for decades and yet there are no major mining operations in place.
I think it's just because it would Look Cool to have a new territory added to the US.
That said, the Greenlanders should decide who to associate with. They might dislike Denmark - and for mostly good reasons - but I doubt they're gonna look at their kin in Alaska and think "they look like they're having a great time!".