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OxQQme

(2,550 posts)
3. COPPER MINES IN ANCIENT NORTH AMERICA
Mon Sep 30, 2019, 11:55 PM
Sep 2019

Copper needed to make bronze with that tin came from around the world, allowing a second bronze age.

>"Evidence shows that someone was mining copper in northern Michigan starting around 5,300 BC. It continued until 1,200 BC. Around 1,000 AD mining was restarted and lasted until 1,320 AD. The largest mine discovered was located on Isle Royale, an island in Lake Superior near the Canadian border. They worked the rock by using fire and cold water to break the copper ore into smaller pieces. Then they could transport it to other locations. One of the mines discovered was three quarters of a mile long, four hundred feet wide and ten to thirty feet deep with connecting tunnels. Scientist and engineers estimate that it would take ten thousand men one thousand years to develop the extensive operations carried on through the region. It is estimated that a total of 1.5 billion pounds of copper were mined by these unknown people. Despite its large size, no evidence of any of the workers was found, only their tools. Octave DuTemple one of the first Archaeologist to investigate the site said the miners left their tools behind as if they would work the following morning, only never to return."<

https://www.expandedperspectives.com/copper-mines-in-ancient-north-america/

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