Millie Mine Bat Cave

Millie Mine Bat Cave

An abandoned vertical iron mine that is now home to one of the largest hibernating/breeding bat colonies (up to 1 million bats) in North America. Mine shaft entrance is covered with a special steel grate to prevent people from falling into the shaft; but allows bats to come and go as they please. There is a self-guided interpretive program at the site to inform visitors on the benefit of bats. Best times to view bats is right at dusk in Apr/May and Sept/Oct when bats leave or enter the mine to hibernate. It is designated as an official Michigan Wildlife Viewing Area.

Millie Mine Bat Viewing Site

Contact Information


Mine Shaft

Park Ave. off East A St

Iron Mountain, MI 49801

Driving Directions

Toll Free: (800) 236-2447


Location of Millie Mine Bat Cave

Map of Michigan