08/01/2026
Long before Europeans arrived, ancient people mined vast amounts of native copper around Lake Superior, especially on Isle Royale and Michigan's Keweenaw Peninsula.
Archaeologists have discovered thousands of prehistoric mining pits, stone tools, and evidence that these mines were worked for nearly 4,000 years.
Then, the large-scale mining ended.
The people didn't simply disappear, but archaeologists still debate why the intensive copper mining stopped and how these ancient trade networks changed over time.
The mystery remains one of the oldest and most fascinating stories in Great Lakes history.
👀 Why do you think one of North America's oldest mining industries came to an end?