While copper prices are about 14 percent higher than a year ago, volatility over the last few months will mean companies will tread with caution, according to Diego Hernandez, president of Chile’s mining association, Sonami. On the other side, unions might have learned a lesson from the Escondida strike, which ended with no agreement, no end-of-conflict bonus for workers and a salary freeze that will only end when the new contract is signed.

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