Codelco says four of the five workers trapped at its El Teniente mine have been pronounced dead, as rescue efforts continue following a powerful tremor that caused the mine to collapse last week.

SANTIAGO (Reuters) -Chilean copper miner Codelco has discovered the remains of one of five trapped miners at its flagship El Teniente mine, it said on Saturday, bringing the death toll from a collapse caused by a strong tremor on Thursday to two people.

All five workers trapped in a collapse at Chile's El Teniente mine were found dead, raising the death toll to six. Codelco will investigate the cause, with questions about natural or mining-related triggers.