Johannesburg, South Africa — 03 September 2013 – South Africa’s gold producers are ramping up security at their operations as the biggest union in the industry prepares to strike over wages.

Members of the National Union of Mineworkers (NUM), which represents 64% of employees, will stop working this evening, after the Chamber of Mines failed to meet demands for wage increases of as much as 60%, reports Bloomberg News. The chamber, which represents seven gold companies including AngloGold Ashanti Limited and Sibanye Gold Limited, has made a final offer to boost pay by 6 to 6.5% for about 142,000 workers.

The gold producers have been making security preparations for “some months” in anticipation of a possible strike, a chamber spokesperson said by phone from Johannesburg. “They had a massive increase in security and planning. There is also very strong coordination with the police at a local and national level.”

Deputy president Kgalema Motlanthe brokered a pact between unions and companies to negotiate peacefully on July 3, which the NUM signed. Strikes cut 0.5 of a percentage point off gross domestic product last year, when at least 44 people, including 34 killed by police in one day, died near the operations of Lonmin plc,  the third-largest platinum producer. Stoppages have already shaved 30 basis points, or 0.3 of a percentage point, off GDP this year, President Jacob Zuma said on June 13.

Members of the NUM won’t force other employees to go on strike, spokesman Lesiba Seshoka said by phone. “If you’re on strike, you’re on strike; if you’re not on strike, you’re not on strike,” Seshoka said.

It’s unclear whether mines where the Association of Mineworkers and Construction Union (AMCU) represents a majority of workers will also come to a standstill when the NUM’s strike begins, the chamber spokesperson said.

The AMCU is the biggest union at AngloGold Ashanti’s Mponeng, Sibanye Gold’s Driefontein and Harmony Gold Mining Co.’s Kusasalethu operations. All three mines are located close to Carletonville, about 80km west of Johannesburg.

The union was still in discussions with members over a possible strike, its president, Joseph Mathunjwa, said last week. Mathunjwa wasn’t available for comment when contacted by phone yesterday.

Trade union UASA, which represents 6.9% of the workers, has accepted the chamber’s offer, head of mining Franz Stehring said by phone.

Source: Bloomberg News. For more information, click here.