The National Union of Mineworkers said in statement on Monday that it had won the case against the South African Federation of Civil Engineering Contractors (SAFCEC), which had last week asked the court to prevent the union from striking.
"Employers must expect no mercy from us, they must deliver 13 percent or we will strike until 2011," said Bhekani Ngcobo, the NUM's Negotiator at SAFCEC in a statement.
World Cup organisers said last week they would meet trade union officials to try to ensure a strike does not delay completion of stadiums beyond target but would not interfere in workers' democratic rights to strike.
"The interdict wasn't granted," said Joe Campanella, spokesman for SAFCEC, adding the unions and employers were in fresh talks to find a resolution but declined to say if the employer organisation would revise its offer.
Companies likely to be hit by the strike include Africa's top construction firm Murray & Roberts Holdings Ltd, WBHO and Group Five.
South Africa's state-owned utility Eskom's 4,800 megawatt Medupi power station could also be affected, slowing efforts to fill a chronic power shortage in the country.
