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In Monday’s violence at Gold One International, miners dismissed after a wildcat strike in June joined miners who lost their jobs two years ago to try to stop other workers and managers from reaching the mine.

Mr. Froneman said the protesting miners stoned a vehicle carrying people to work.

“Our security had to intervene. They used rubber bullets, and police used rubber bullets and tear gas,” he said. “Four people were slightly wounded, and all have been released from the hospital.”

Police spokeswoman Pinky Tsinyane said one of those wounded was in critical condition. The different versions could not immediately be reconciled. Ms. Tsinyane also said four people were arrested for public violence.

Politically connected

The Gold One International mine was bought two years ago by a group including Mr. Zuma’s nephew and a grandson of anti-apartheid icon Mr. Mandela. The two allegedly never paid for the mine but stripped it of most assets. They are now are sued by liquidators. They have also failed to honor court orders to pay tens of thousands of dollars to the miners who were thrown out of work.

Cabinet ministers, meanwhile, sought to reassure investors Monday even as news of the latest clash emerged.

“The tragic incident at Marikana is not a reflection of the business environment in South Africa,” Collins Chabane, the minister of state in the presidency, told foreign reporters.

“The government remains in control of the situation, and law and order continue to prevail. The country continues to fully support direct investment and appropriate incentives, and the legislative framework is in place to give confidence and predictability to investment decisions.”

Legislator James Lorimer of the opposition Democratic Alliance blamed the latest violence on Mr. Malema, an expelled youth leader of the ruling African National Congress who has been using the unrest to try to oust Mr. Zuma from power.

Mr. Malema, who has called for the nationalization of South Africa’s mines and for Mr. Zuma to resign over the police killings, went to the gold mine last week and told miners they must fight for their economic freedom.

He sent a message on Twitter on Monday, saying he was addressing strikers at the Gold Fields mine.

“[The] Mining Revolution goes on and on and on,” he wrote.

Union rivalry

The violence that led to the police shootings at London-registered Lonmin PLC mine at Marikana and the Gold One International gold mine was at least partially rooted in union rivalry. Upstart unions have stolen thousands of members away from the dominant National Union of Mineworkers.

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