Nearly 1,000 South African gold miners rescued after a day underground

All 955 gold miners who were trapped underground for more than a day in South Africa following a power cut were brought back to the surface on Friday unharmed, the mine's owner Sibanye Gold said.

"Everybody's out," mine spokesman James Wellsted said, adding that there were "cases of dehydration and high blood pressure but nothing serious".

The miners were stuck in the Beatrix gold mine, in the small town of Theunissen near the city of Welkom, for around 30 hours after a massive power outage caused by a storm prevented lifts from bringing workers on the night shift to the surface.

After engineers restored power, the miners - who had been trapped since Wednesday evening - were brought up in batches within two hours.

"It was stressful, there was not enough ventilation," said mineworker Mike Khonto. "Thankfully our management managed to send us food and water."

Asked if there had been any casualties, Mr Wellsted said there was "no indication so far that anyone has been in distress" although it had been a "traumatic experience".

Several ambulances arrived at the site overnight.

At sunrise the workers left by bus after undergoing medical check-ups.

The miners' family members had earlier gathered along the road to the shaft, kept at a distance by security guards as they waited for news.

The accident at Beatrix mine in Free State province, 290 kilometres south-west of Johannesburg, has reignited safety concerns at South African mines.

The National Union of Mineworkers (NUM) has called on mineworkers to refuse to work in "dangerous conditions".

"Major multinational corporations like Sibanye-Stillwater which should be industry leaders in creating a safety culture are doing far too little to prevent accidents," the union said in a statement overnight.

A parliamentary committee on mining expressed outrage at the incident, calling for "drastic" action against the mining company.

It blasted as "utterly unacceptable" that the mine had no backup plan to bring the workers to the surface.

Last August five miners died after sections of a gold mine collapsed outside Johannesburg.

The country possesses rich mineral reserves and has some of the world's deepest gold mines.

Gold was for many decades the backbone of South Africa's economy, but production has declined sharply due to depletion of reserves.