I collect this in 1968 while mapping underground at the Caribou mine. In specific, there was a location in the mine where the massive sulfide layers were cut and displaced by a fault zone, creating an offset of more than 30 m. The stiff sulfide layers were fractured and broken, and locally polished and slickenlined. I like the fact that this is naturally polished metal.
Age & Formation
Tetagouche Group of Ordovician age, ~420 Ma.