Old Three Rivers Public Library

Historical marker location:

107 N. Main St, Three Rivers, Michigan

( Marker is at the intersection of North Main Street (Business U.S. 131) and Moore Street, on the right when traveling north on North Main Street.)

Marker installed: 1984

The Upper Peninsula of Michigan was once a major center for copper mining. The Keweenaw Peninsula was home to the largest concentration of copper mines in the world in the mid-19th century, and copper was an important natural resource for the state's economy.