The new agreement replaces a previous three-year contract that would have seen Nautilus supplying 1.1 million tonnes of unrefined copper ore to Tongling Nonferrous Metals Group.
Rival gangs are preying on a small community at Goldcorp's Los Filos gold mine in Mexico's Guerrero state leaving at least 26 people dead since mid-2014.
Rob McEwen, explains why he still thinks that this is a possibility in the next four years and how companies can take advantage of technology to ensure that a price rise goes to the bottom line—and ultimately shareholders.