Cliff Mine (Keweenaw County, Michigan)

The Cliff mine was the first successful copper mine in the Copper Country of the state of Michigan in the United States. Located at the now-abandoned town of Clifton in Keweenaw County, mining began in 1845, and the Cliff was the most productive copper mine in the United States from 1845 through 1854. Large-scale mining stopped in 1878.