Highly doubtful. Michigan instead of Minnesota? They must have invented gps's that long ago. Now the boat if it is real is another story.
The GH author I believe claims actual copper artifacts other than this one. If they exist and they have the Michigan purity then we might have a ball game. otherwise the author is blowing smoke.
The boat again is another thing altogether. The pictures obviously show a boat. it seems similar to ancient med or viking. Certainly not local indian. It has to be in the location specified. Then patina experts can determine if it is ancient or post columbus. if pre columbus it does NOT matter about the copper. The boat itself would be a big story.
