Up in Ontario, Ca. there is a 150 mile diameter meteor impact crater. The embedded fragments of that meteor in the surrounding geology are the basis for the Sudbury Basin mines for copper, nickel, platinum group metals in general. Extraction operations have been ongoing for the last 100 years.
A similar occurrence (Hiawatha) has been discovered buried underneath a half mile thick ice sheet in NW Iceland, about 150 miles from the Thule AFB. Assay work upon associated meteor fragments supports a similar rich find, with the addition of a frosting of gold. Subsequent NASA research suggests another such large crater lies 114 miles from the Hiawatha crater location.
Correction: a crater 150 km or 90 miles!
Greenland sounds like a good investment. All that aside, fresh water is still a great commodity. More wars have been fought over water than anything else in history. Gold, rare metals etc are nice too heh.