TAMARACK, Minn. — In this isolated town of about 100 people, dozens of employees are at work for Talon Metals, drawing long cylinders of rock from deep in the earth and analyzing their contents. They liken their work to a game of Battleship — each hole drilled allows them to better map out where a massive and long-hidden mineral deposit is lurking below.

This Remote Mine Could Foretell the Future of America’s Electric Car Industry