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About 950 workers remain trapped in a gold mine in South Africa after a storm caused a power cut, preventing them from getting out,

Without electricity, lifts could not bring the night shift workers to the surface, but they "appear to be fine", a spokesman for their employer said.

He said about 65 miners have so far been rescued and all are accounted for.

Trade union officials said they feared that the lives of the miners, trapped since Wednesday night, were at risk.

South Africa is a leading gold producer, but the industry has often been accused of a poor safety record.

The Beatrix mine is in Welkom town, about 290km (180 miles) south-west of Johannesburg. It is owned by Sibanye-Stillwater mining firm.

It has 23 levels, going down to 1,000 metres (3,280 ft) below ground.

"All employees appear to be fine. We are supplying food and water," company spokesman James Wellsted was quoted as saying by the AFP news agency.

Engineers were struggling to get emergency generators to operate and to get the lifts working again, he added.

"We are busy working on that issue at the moment," Mr Wellsted said.

The National Union of Mineworkers (Num) said the rescue process was "very slow".

"The problem is they are rescuing one mineworker at a time. It is worrying," Num spokesman Livhuwani Mammburu said.

The Association of Mineworkers and Construction Union (Amcu) said its concerns about dehydration and a lack of food had been heightened by "the sheer number of workers" trapped.

"Mining is very unsafe, and mineworkers risk life and limb daily to put bread on the table for their families," Amcu leader Joseph Mathunjwa said in a statement.

South Africa has some of the world's deepest and most dangerous mines.

More than 80 fatalities were recorded in the country's mines in 2017.