The Upper Peninsula of Michigan had abundant native copper deposits. Ancient mining in the region dates back at least 7,000 years, with evidence of cold-hammered copper tools, knives, and ornaments from the Old Copper Culture (circa 4,000 BC onward). While tonnage estimates for North American artifacts and Old World extraction vary in archaeological literature, specific percentage claims about missing or preserved copper in the archaeological record remain contested and difficult to verify.
North America had copper surplus opposite to Old World shortage
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Key facts
- North America (Upper Peninsula Michigan) had native copper deposits
- North American copper artifacts: minimum 1,000 tons to maximum 5,000 tons
- Old World copper extraction: 100,000-500,000 tons (some say 680,000 tons) 4000-1000 BC
- 99% of copper from Old World is missing in archaeological record
- 1.7% of North American copper appears in archaeological record
- Pure copper was extracted relatively easily through cold hammering
- No smelting signs found at large North American extraction points
Sources
independent.academia.edu
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