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.
A team of MIT researchers in the United States has shown that they can separate pure copper and other trace elements from sulphur-based minerals using molten electrolysis.
The Tanzanian government submitted three bills to parliament on Thursday that would allow it to force mining and energy companies to renegotiate their contracts.
