Updated

Rescuers are working to reach at least 25 miners trapped in a gold mine landslide in northern Nicaragua.

Marta Lagos is an official of the ruling Sandinista Party and she says rescuers hear voices and presume that all those trapped are alive. Lagos told Channel 4 TV early Friday that they are working to establish contact through an old mine shaft and searching for old tunnels to reach the miners.

The slide occurred Thursday at the El Comal gold and silver mine in the town of Bonanza, about 260 miles (420 kilometers) northeast of Managua.

Authorities didn't receive word until late Thursday when the mine lost contact with the workers, who are believed to be about 50 feet deep.