Guest columnist: Technology finding lost cities, America’s hidden minerals

Once the world’s mining superpower, the United States is now dangerously reliant on Chinese mineral supply chains. Yet, as we race to reclaim our mineral security, we’re fighting blindfolded.Unlike our peer nations, the United States has only just begun to use modern tools to map our mineral resources. In other words, our understanding of our own resource potential is but a fraction of what it should be.Archaeology gives us an important clue as to what we might be missing. Over littl