• Underground Tamarack Trammer Car


    National Historical Park Michigan

Calumet Visitor Center Project - Union Building Background Information

Historic Use of the Interior Space of the Union Building, Special Report prepared by Stephanie K. Atwood. (Adobe pdf - 1.26 MB)

Did You Know?

Photo: Float copper on exhibit in Calumet

During the ice ages, glaciers ripped chunks of copper away from exposed rock outcrops and then carried the copper sometimes long distances before depositing them. These loose pieces are referred to as float copper.