Upper peninsula copper

[Aolbrantz]

I found this near shoreline of Upper Michigan lake, near Wisconsin border. I screwed up and cleaned it a bit. There was a bit of what seemed to be a pine tar like substance on one side. I know it's copper, just can't tell if its worked/formed, or perhaps natural state left by the glaciers coming down from the Kewenaw Peninsula.

 

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[Aolbrantz]

 

[mick56]

Could be "Float Copper", pretty common around here. 1000's of years ago, the natives would pick the pieces of copper up and make tools and hunting points out of them.