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Mine in the Great Lakes

Posted on behalf of <dre8@webtv.net>

I'm looking for information on a mine (closed now) that was located on a
shoal or reef in the Great Lakes. It was also the site of quite a few
shipwrecks before they discovered it was there. It was only about 1 to 2
feet below the water surface at high water. I guess they had to build a
type of dam around the shoal (island?) to sink the shaft. I believe they
mined it for copper. Any info is appreciated.