By Devon Maylie

JOHANNESBURG--Glencore Xstrata PLC (GLNCY) said Thursday that 1,500 workers embarked on a wildcat strike this week at three of its South African chrome mines.

The company said the industrial action started Tuesday at its Helena mine, east of Johannesburg, when 200 workers went on strike to protest what they said was abuse by a manager against one of the employees. The workers then mobilized and the strike spread to the company's Magareng and Thorncliffe mines. The company said it is investigating the employee claim.

"Production has been negatively affected," a spokesman for the company said, declining to give a figure for the exact loss.

The company said the 200 workers that started the strike have been dismissed and have until Saturday to appeal.

The Glencore Xstrata strike comes amid a renewed wave of labor disruptions that started earlier this month when workers shut down Lonmin Plc over a union dispute.

Gold and coal producers are preparing to negotiate with unions over a new two-year wage agreement next month. The talks are normally accompanied by strikes.

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

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