AROUND 3,000 workers in a gold mine near Johannesburg, in South Africa are trapped after a water pipe burst and soil in an underground shaft collapsed today.

No one from the management of Harmony Golds Elandsrand Mine in Carletonville was available to comment.

The spokesman for the National Union of Mineworkers, Lesiba Seshoka, said the managers were meeting with union members.

Miners had gone down the shaft, then the water pipe burst, and they had not been heard from since about 10am, he said.

"It's a terrible situation," Seshoka said. "The only exit is blocked, probably by a fall of ground."

Gold mine shafts in South Africa are typically 3,000 meters below ground or more, he said.

The union feared the men could be trapped without oxygen because of collapsed ground, or impeded by rock falls and mud slides by the burst water pipe.