By Devon Maylie

JOHANNESBURG--Mining companies and living conditions of mine workers are to blame for the labor unrest spreading through the South African mining sector, threatening one of the country's key industries and harming its international reputation, the ruling African National Congress said Monday.

In a statement following a weekend meeting of party leaders, ANC secretary general Gwede Mantashe said companies have "paid lip service" to a mining charter that seeks to uplift workers and their communities and thus need to do more.

"The socio-economic conditions of the mine workers at Marikana and other areas are part of what led to the human tragedy that continues to haunt our nation," Mr Mantashe said.

The mine unrest started Aug. 10 when 3,000 rock drillers downed tools at Lonmin's Marikana mine. In the days that followed, clashes between employees left 10 dead. Tensions peaked Aug. 16 when police fired live ammunition into a crowd of protesters, killing 34 people. One more body was found last week at the mine.

Behind the strikes are demands for higher wages by workers frustrated at the slow pace of change since the end of apartheid 18 years ago. Workers have rejected the National Union of Mineworkers, the country's biggest union and an ally of the ANC, fueling the discord.

Mr Mantashe said that to return to stability and protect workers rights, the platinum industry should follow the gold and coal sectors and apply collective bargaining, whereby all platinum miners negotiate wages at the same time with the unions.

"As a liberation movement, we continue to support the principle of one industry one union, as this helps to unite workers in particular sectors," he said.

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

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