There really aren't that many new sources of copper. The ones I have reported on all seem to have problems. Some have massive environmental impacts. Others, worldwide, have first nations objectors. There is a difference between a natural deposit in the ground, however massive, and a resource that can become an ore reserve. Trump seems to be finally overruling the objections to Resolution Copper in Arizona, but it will be the deepest large underground mine in the world and I expect there will be massive problems developing and operating it. It will be a Block Cave 2000 metres deep. Recent block caves by Rio Tinto have not gone well.