Four of the five workers trapped in a Chilean copper mine that partially collapsed this week have been found dead, authorities said Sunday, as rescue workers continue their search for the remaining miner trapped in the debris.

Officials say that a worker was killed and five others remain trapped underground after a collapse at a copper mine in Chile.

A rescue operation in Chile at the world’s largest underground copper mine ended on Sunday with no survivors, as the body of a fifth missing miner was found days after a tunnel collapsed, officials said.