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According to the link posted below, Early Minnesota History, these type of copper tools were used from 1000 to 600 BC. After which time, copper tools became scarce (possibly due to a limited supply of readily found surface copper?)
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Just out of interest, 600 BC. Also marks the end of what is called the Nordic Bronze Age ( http://en.wikipedia.org/wiki/Nordic_Bronze_Age )
That's kind of interesting, as it has been speculated by some that the Norse Vikings were involved with trade more extensively and much farther inland than previously believed. It has been suggested that the Vikings had regular trade routes with the Indians in that area by way of the Great Lakes, and that copper was one of the main commodities traded for use in smelting bronze. It's kinda interesting that 600 BC marks both the end of the use of copper by the indians and the end of the Viking's Bronze Age.
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Awesome finds Alfano, hope this helps point you in the right direction!