It seems to me that some sort of isotope analysis ought to put the question to bed pronto.
If there was a conclusive comparison, you and I would know about it.
So, I have to assume that it does not compare.
I don't trust this Graham Hancock stuff:
Michigan Copper in the Mediterranean
"Recent scientific literature has come to the conclusion that the major source of the copper that swept through the European Bronze Age after 2500 BC is unknown. However, these studies claim that the 10 tons of copper oxhide ingots recovered from the late Bronze Age (1300 BC) Uluburun shipwreck off the coast of Turkey was “extraordinarily pure” (more than 99.5% pure), and that it was not the product of smelting from ore. The oxhides are all brittle “blister copper”, with voids, slag bits, and oxides, created when the oxhides were made in multiple pourings outdoors over wood fires. Only Michigan Copper is of this purity, and it is known to have been mined in enormous quantities during the Bronze Age. "
I think we have a winner, that looks to be the information I was referring to, please keep in mind that they have found stone ruins that are over 30,000 years old in various parts of the world.