Good evening everyone, back with some more from Richard Dewhurst's 'The Ancient Giants Who Ruled America'

..Located in Lake Superior off the northern tip of the Keweenaw Peninsula in northern Michigan, Isle Royale, also known as Royal Island, is one of the most interesting ancient sites in America. Not only is the island literally made out of the highest-grade copper in the entire world, but its name also suggests its royal status in the minds of the ancient giants of the North American copper kingdom. Significantly, a quick look at a modern map of the United States quite clearly shows that the northern border of America was drawn to include this island, showing, again quite clearly, that someone knew of the extreme importance of this innocuous little island.

Because of a freak volcanic event that twisted the copper-bearing bedrock above the water line, thus allowing all the sulfur impurities to burn away in the open air, the copper at Isle Royale is the purest found anywhere in the world. The entire region is scarred by ancient mine pits and trenches up to twenty feet deep. Carbon-dating testing of wood remains found in sockets of copper artifacts indicates that some are at least 5,700 years old, while other open digs around the area have been dated from eight to ten thousand years old.
https://exploringrealhistory.blogspot.com/2022/07/part-7-ancient-giants-who-ruled-america.html