The top mining port in Chile, Antofagasta, has workers striking for a second day in a row.  Demands for higher pay and better working conditions are the reasons behind the strike.

Workers started their strike at Antofagasta, which serves Chile’s northern mining region, just before midnight on Tuesday, leaving at least one copper shipment delayed for global miner Xstrata Copper.

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Mines producing about a third of the world’s copper utilize the port for shipment.  

Antofagasta is the primary point of exit for copper in cathode from Escondida, the world’s largest copper mine and owned by global diversified miner BHP Billiton.

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Canadian Barrick Gold Corp‘s Zaldivar and Freeport-McMoRan Copper & Gold Inc’s El Abra mine also use Antofagasta for shipping copper.