Historical Marker
Assumption Roman Catholic Church / Assumption Grotto Church Complex
Historical marker location:
13770 Gratiot Ave, Detroit, Michigan
( Marker is at the intersection of Gratiot Avenue and Mapleridge Street, on the right when traveling north on Gratiot Avenue.)
Marker installed: 1992
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.