The men were trapped on Thursday while working in a copper mine that had been shut down since the 1980s. It collapsed following a blast set by the miners themselves.
Several dozen rescue workers have been using pickaxes and shovels to try to remove the 26 feet of collapsed earth and rock blocking the mine's entrance.
Through a hose, rescuers have been able to communicate with the trapped miners and provide them with liquid sustenance.
The Associated Press contributed to this report.