By Alex MacDonald

LONDON--Anglo American Platinum Ltd. (AMS.JO) said Friday it will dismiss 12,000 workers at its Rustenburg mine as illegal strikes that have already cost the company 700 million rand ($82.6 million) in lost revenue spread to three more operations.

The world's largest platinum producer accounting for some 40% of the world's output now has six mines out of operation and a smelter offline after an insufficient number of workers failed to show up to work due to illegal strikes. The strikes, which began three weeks ago, have now cost the company about 39,000 ounces in lost platinum.

The illegal strikes began to flare in August when clashes between police and workers resulted in 46 deaths at platinum producer Lonmin PLC's (LMI.LN) largest mine. The strikes have since spread to the other mines in the gold, coal, and iron ore sectors as well as the transportation sector. Oil major Royal Dutch Shell PLC (RDSB) Friday declared a "force majeure" on some fuel deliveries in response to strikes by 20,000 truck drivers.

The strikes, which have been exacerbated by feuding between two mining unions, have centered on calls for higher wages and better living conditions.

Anglo Platinum, which is majority owned by Anglo American PLC (AAL.LN), said less than 20% of its employees in the Rustenburg region have shown up to work, rendering four mines inoperable.

The company held disciplinary hearings over the illegal strikes and decided to dismiss about 12,000 striking employees, about a fifth of Anglo Platinum's total workforce, after they failed to attend disciplinary hearings. The workers will have three working days to appeal the hearing.

The strike has also spread to the company's Union and Amandelbult mines where workers presented similar demands to those received in Rustenburg, the company said. The illegal strikes have led to the shut down of both those mines and the Mortimer smelter.

Chris Griffith, chief executive of Anglo Platinum said: "The company is committed to participating in the Platinum centralized engagement structures driven by the Chamber of Mines, as well as exploring the possibility of bringing forward wage negotiations within our current agreements."

Kumba Iron Ore Ltd. (KIO.JO), Anglo American's South African iron ore division, also had to suspend operations at its Sishen Mine, South Africa's largest iron ore mine, on Thursday after 300 non-unionized workers went on strike over wages.

Kumba said it won't engage the protesters in wage talks after having signed a two-year wage agreement two months ago.

South Africa's Labor Minister, Mildred Oliphant, said earlier Friday that she is particularly worried about the Kumba strike because the workers' demands don't make sense and are taking place outside union control.

Devon Maylie in Johannesburg contributed to this article

Write to Alex MacDonald at alex.macdonald@dowjones.com

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