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In page Mining:

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During prehistoric times, early Americans mined large amounts of copper along Lake Superior's Keweenaw Peninsula and in nearby Isle Royale; metallic copper was still present near the surface in colonial times.[1][2][3] Indigenous peoples used Lake Superior copper from at least 5,000 years ago;[1] copper tools, arrowheads, and other artifacts that were part of an extensive native trade-network have been discovered. In addition, obsidian, flint, and other minerals were mined, worked, and traded.[2] Early French explorers who encountered the sites made no use of the metals due to the difficulties of transporting them,[2] but the copper was eventually traded throughout the continent along major river routes.[citation needed]