Taconite is all that remains, since the still more lucrative hematite ran out in the 1950s.  
Although some locals deny that they are really mountains, they reach as high as 2,000 ft. and they were named from an Ojibwa word meaning "giants."  Geologically similar to the nearby Vermillion and Cuyuna ranges, they are essentially unremarkable, except for their economic value, which is mainly due to high-grade deposits of taconite.  Taconite is all that remains, since the still more lucrative hematite ran out in the 1950s.  FTP, identify this Minnesota range, famous for its vast deposits of iron ore.
Although some locals deny that they are really mountains, they reach as high as 2,000 ft.
Mesabi Range