Was metal detecting with the daughter a few weeks ago next to some old train track and an old train bridge, and found this. I live in Upper Michigan, just North of here is considered "Copper Country" and I was wondering if this was some type copper ore, possibly iron and copper I cant tell. It does have a green tint to it and on the bottom where it was exposed to the dirt was red and green.

Sorry for the quick pick. I will get more later. Its over a foot wide and a good 6 inches tall. My guess its probably close to 40-45 pounds.