Very interesting indeed.
Here in Pennsylvania, tools were generally made out of stone, not copper.
However, in the Upper Peninsula of Michigan, the indians knew about the mass amount of copper in their area and used it in jewelry, ceremonial artifacts and tools. I have seen grinding tools, stripping tools, scraping tools and axe heads up there, but never in Pennsylvania. The indians realized quickly that it did not work well for an axe however, way too soft of a metal; so they continued to use rocks for their axe heads. I would be interested to know if any other type artifacts have been found here.
If this "does" prove to be indian, and it is indeed a hatchet head; you have a very rare artifact.
A lot of indian artifacts have been uncovered in the past two years in Pennsylvania due to the 2006 flooding. The banks of the creeks/rivers were inhabited by a lot of indians whose artifacts were buried, until the recent flooding dug it all up.
I have found a lot of stone artifacts, never copper or any other type of metal in Pennsylvania.
Can we have different angles of it?