An easy way to appreciate its significance are these excerpts below from pages 10 and 13 of a Freeport presentation last November.
Morenci's production estimate for 2014 makes it the 4th biggest copper mine in the world, and largest in the U.S.
[Figures from Freeport McMoRan Copper & Gold]
Prorokia ?cingulata (Geinitz, 1873)
6 hours ago