By Devon Maylie

JOHANNESBURG--Gold Fields Ltd. (GFI) Monday said the illegal strike at its KDC gold mine has spread to the west section, halting production and signaling further contagion of the sometimes violent unrest hitting South Africa's mining sector.

About 15,000 workers staged an illegal strike Monday at the west section of the mine, located in the West Rand area in the northeast of the country, following similar action at the east side last week, the company said. Last week's strike had been prompted by an internal union dispute, but that was resolved for those workers and production was resumed on Thursday. The company said the west-section workers could be striking for similar reasons, and will meet with striking worker representatives later on Monday. The KDC west section produces about 1,440 troy ounces of gold a day.

South Africa's mining sector is reeling from a series of strikes over the past month that have resulted in 44 deaths and hit production of metals such as gold and platinum. The unrest has also exposed deep rifts in the country's labor movement, threatening to bring about a spread of work stoppages and output disruptions as new unions recruit for members and worker frustrations are fanned by different political groups.

The strikes started on Aug. 10, when 3,000 rock drillers downed tools at Lonmin PLC's (LMI.LN) Marikana mine. Workers clashed in the following days, resulting in 10 deaths, before police fired live ammunition into a crowd of the protesters on Aug. 16, killing another 34 people. Further strikes have also been held at Anglo American Platinum Ltd.'s (AMS.JO) Thembelani mine, when several hundred workers refused to go underground in mid-August, while operations at a Royal Bafokeng Platinum Ltd. mine were halted briefly at the same time. Impala Platinum Holdings Ltd. said it too has received a renewed wage demand from its workers last week following a similar strike that shut its largest mine for six weeks in February.

The Lonmin strike has cost the company about 50,000 ounces of platinum output, and despite efforts backed by the government to broker an end to the illegal action, many workers remain away. Lonmin and some of the unions signed a deal to end the violence and have workers return by Monday, but the company said only about 6.3% of employees showed up at the mine. Lonmin said Monday it will also begin discussions over the workers' wage demands.

At the heart of many of the strikes are worker grievances around pay and the slow pace of change at the mines since the end of apartheid. Taking advantage of those sentiments, an emerging union called the Association of Mineworkers and Construction Union has been actively recruiting at the mines with promises to get workers higher pay. That has sparked clashes and internal disputes at the country's largest mine union, the National Union of Mineworkers, an ally of the country's ruling African National Congress.

Gold Fields said during the strike at the east section of KDC last week that workers told mine management they wanted new NUM leaders.

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

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