Chile's Codelco said on Monday that its Chuquicamata copper mine, one of the world´s largest, had maintained output at 50% of capacity as it faced its fourth full day of a union strike. More than 3,000 unionized workers at the world's top copper producer's sprawling Chuquicamata copper mine walked off the job last week after failing to reach a labor deal earlier this week with Codelco. Chile's state-run miner said it has scrambled to put to work some 1,400 miners, most of whom pertain to unions which earlier struck contract deals with the company and had opted not joined the strike. "For now we are maintaining ... (full story)