--Gold One says its security guards used rubber bullets to disperse illegal strike

--Police say four people hospitalized

--Strikes spreading across mining sector

(Adds details of new protest at Gold One, police and company comments.)

By Devon Maylie

JOHANNESBURG--Gold One International Ltd. (GDO.AU) said four protesters were treated at a hospital for injuries Monday after its security guards fired rubber bullets and police fired tear gas to disperse an angry crowd in an illegal strike at its mine in South Africa.

The latest labor clash left South African authorities once again scrambling to restore the peace, following a spate of illegal strikes that first affected platinum miners and now gold producers. The strikes have rippled through South Africa's mining sector since police shot into a crowd of protesters Aug. 16 at Lonmin PLC's (LMI.LN) Marikana mine, killing 34 people. The sometimes violent protests have disrupted mines' production, pitted unions against one another in a growing battle for membership, and rocked the nation's political establishment.

The strike at Gold One's Modder East mine began early Monday when protesters blocked the entrance. The protesters included about 60 former employees from the company and from a nearby mine, which President Jacob Zuma's nephew and former president Nelson Mandela's grandson used to run.

South Africa's second-largest gold producer, Gold Fields Ltd. (GFI), also said Monday that workers continued an illegal strike at its KDC Gold Mine, which had begun Wednesday evening.

Expelled African National Congress Youth League leader Julius Malema has inflamed the tensions by visiting mines to call on workers to strike for better conditions, including a visit last week to those around the Gold One mine.

Gold One said the striking workers Monday threw stones at vehicles entering and exiting the mine until tear gas and rubber bullets broke up the crowd.

Police spokeswoman Capt. Pinky Tsinyane said an investigation is under way after police arrested four people and another four were taken to the hospital for treatment. The striking miners, carrying traditional sticks and iron rods, had rushed toward the police, Ms. Tsinyane said.

In June, Gold One dismissed 1,035 workers who had joined an illegal strike. Some of those protesting outside the company's mine Monday had been fired in June.

Another group of workers joining the protest were from the gold mine previously operated by Aurora Empowerment Systems, a consortium run by Mr. Mandela's grandson Zondwa Mandela and Mr. Zuma's nephew Khulubuse Zuma.

Liquidators in 2009 awarded the East Rand property to be managed by Aurora Empowerment Systems. But the team stopped paying workers and didn't perform maintenance at the property. Liquidators finally kicked the company off the property this year. Gold One is in the process of purchasing the mine area.

The strikes come as the government tries to calm tensions in the mining sector, after state prosecutors charged 270 of the Lonmin protesters with murdering the 34 fellow protesters who were shot earlier this month. The state prosecutors backed down from the charges over the weekend in the face of political backlash.

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

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