FILE PHOTO: Used copper wires are seen in a recycling

Miners seek partners for copper assets as M&A heats up

FILE PHOTO: Used copper wires are seen in a recycling company in Thoerishaus near Bern

FILE PHOTO: Used copper wires are seen in a recycling company in Thoerishaus near Bern July 3, 2011. REUTERS/Ruben Sprich/File Photo