SANTIAGO, Aug 3 (Reuters) - All five workers at Chile's El Teniente copper mine who were trapped in a collapse last week have been found dead, miner Codelco said on Sunday, as it vowed to investigate the cause and improve safety measures.

Chilean authorities confirmed the recovery of the body of the last missing miner following Thursday's collapse at the El Teniente mine.

The bodies of all five miners trapped in a collapsed shaft in the world's biggest underground copper mine for three days have been found and identified, an official said Sunday. Aquiles Cubillos, the lead prosecutor in Chile's O'Higgins region,