For over 6,000 years, Native peoples worked Lake Superior's incredible copper deposits. At up to 99.9% pure, it was among the purest on Earth — no smelting required. Native peoples made tools, fish hooks, needles, and beads. Mining concentrated on Isle Royale and the Keweenaw Peninsula in shallow pits.
Old Copper Culture: 9,500 Years of Native Copper Mining Near Lake Superior
Site mentioned
📍 Isle Royale
Key facts
- Native copper deposits around Lake Superior used from 9,500 to 3,000 years ago
- Copper was 99.9% pure, exceeding all other known deposits on the planet
- Native Americans didn't need to smelt the copper - skilled craftsman could heat and shape it
- Large copper chunks as big as a car were readily available
- In 1997, a 26-ton copper chunk was pulled from Lake Superior - the largest known nugget
- The easily obtained native copper deposits were eventually depleted
- Mining operations concentrated on Isle Royale with shallow pits no more than 30 feet deep
- Artifacts made included tools, fish hooks, needles, and beads
- By European contact, descendants were only using small copper items due to resource depletion
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