Workers at Zaldivar are set to vote on a strike this week, while supervisors at Centinela mine have already decided it, but expect a government mediation mechanism to extend negotiations for at least five more days.
Dam restrictions in China following excessive rains are also reducing hydropower capacity there, including at the world's biggest power station, forcing utilities to ramp up output at coal-fired utilities.
The company also evacuated all of its employees at Namoya mine after trucks belonging to a contractor were caught in crossfire between soldiers and a local self-defence militia.