Lundin Mining Corporation - Eagle Mine, USA - Tue Jun 19, 2018
The only active copper mine in upper Michigan. It was recently awarded (10/17/17) permits to go under the river to a much lager underground deposit.
To the best of my knowledge (casual mine interest) the other copper mines are essentially played out and not worth it to restart as the ore is gone. Unless there is a situation such as in Butte MT where the increasing price of copper basically allows them to profitably mine high grade dirt for the next 40 years, those mines are done producing.