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In WI they would build fires around the rocks that held copper .Then when it got very hot they would pour water on the rocks to crack them. After that they would pound on the rocks with rock hammers and get the raw copper out of them.My family owns land on an old copper mine. I've been told that the natives founded copper by using white flint with green copper tarnish to build camp fire rings. The heat, I suppose would extract the metal from the quartz, and they would find this hard material on their next trip to that area. ( nomadic natives) several have been found on our farm, but I have never found one. I don't know just how true this is, it sounds good, but if a camp fire would burn hot enough to extract copper from quartz, I'd be a millionaire!