A miner works at copper ore at Polkowice-Sieroszowice mine, part of KGHM, in southern-western Poland

A miner works at copper ore at Polkowice-Sieroszowice mine, part of KGHM, in Polkowice near Lubin, southern-western Poland in this July 29, 2011 file photo. KGHM’s C$3 billion ($2.96 billion) bid for Quadra FNX is widely being viewed as a low-ball offer, and its proposal may well result in a full-blown bidding war for the Canadian miner, which controls one of the world’s largest undeveloped copper projects. Picture taken July 29, 2011. REUTERS/Kacper Pempel (POLAND – Tags: BUSINESS ENERGY INDUSTRIAL) – RTR2V0EU