Environmental News

How important is a Twin Metals mine to supply critical minerals?

A core sample drilled from underground rock near Ely, Minn.
A core sample drilled from underground rock near Ely, Minn., shows a band of shiny minerals containing copper, nickel and precious metals, center, that Twin Metals Minnesota LLC, hopes to mine near the Boundary Waters Canoe Area Wilderness in northeastern Minnesota.
Steve Karnowski | AP 2011