"Chile's Codelco suspended copper production for an entire day at one of its four mining divisions on Tuesday and curbed operations at another plant following violent protests by striking workers.

The disturbances were the most serious yet in a two-week stand-off between Codelco, the world's biggest copper miner, and subcontracted workers who are demanding improved pay and conditions.

Codelco, which provides the world with more than 10 percent of its copper, stopped extracting minerals at its El Teniente division in central Chile after protesters wrecked trucks carrying copper from the mine and hurled stones at buses transporting workers to their shifts."

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