JOHANNESBURG--The strike at Gold Fields Ltd. (GFI) KDC mine spread to a second operation, the company said Tuesday, as miners at other major gold and platinum mines in the country continue their industrial action for higher wages.

Gold Fields, South Africa's second-largest gold producer, said that the strike at the west section of its KDC Gold Mine on the West Rand continues and that workers from its Beatrix Mine in the Free State also went on strike Sept. 21.

A spate of strikes have swept through the country's mining sector since 3,000 rock drillers at platinum producer Lonmin PLC (LMI.LN) stopped work at the mine Aug. 10 to demand higher wages. The strike, which left 46 people dead in clashes between employees and police, has since spread to other major gold and platinum mines.

Lonmin settled its strike with an 11% to 22% pay rise but miners at four of Anglo American Platinum Ltd. (AMS.JO) platinum works continue to strike for higher wages, and 5,000 workers downed tools at AngloGold Ashanti Ltd.'s (ANG.JO) Kopanang mine last week.

The strikes are destabilizing the sector, which employs some 300,000 people, and putting pressure on companies that say they are already struggling with rising inflation for both labor and energy costs. Miners aren't the lowest paid in the country but entry level wages average between 5,000 rand a month and 6,000 rand a month, according to the country's union federation Cosatu.

Lonmin lost more than 60,000 troy ounces of platinum output due to its strike and Gold Fields said by the close of today it will have lost about 20,000 ounces of gold production.

At the heart of the strikes is worker dissatisfaction with the pace of change since the end of apartheid and frustration with union leadership, particularly within the National Union of Mineworkers. At Gold Fields' KDC mine, workers are demanding leadership changes within the NUM. So far, the NUM hasn't been able to broker a deal to end the strike.

Gold Fields and Anglo Platinum have the right to dismiss workers because the strike wasn't sanctioned within the country's labor laws. Anglo Platinum started meetings with workers Tuesday using the state labor mediator while Gold Fields says it continues "explore all options."

Write to Devon Maylie at devon.maylie@dowjones.com

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