U.S. mines are literally throwing away critical minerals
Grist reports: The United States is home to dozens of active mines. Some extract copper, while others dig for iron. Whatever the resource, however, it usually makes up a small fraction of the rock pulled from the ground. The rest is typically ignored. Wasted. “We’re only producing a few commodities,” said Elizabeth Holley, a professor of mining engineering at the Colorado School of Mines. “The question is: What else is in those rocks?” The answer: a lot. In a study…