The strike by thousands of South African platinum miners, which led to the police murder of 34 workers August 16 at Lonmin’s Marikana mine, is spreading to other companies in the industry.

Rock drill operators walked out at the nearby Royal Bafokeng platinum mine Tuesday night, shutting down production at the site that employs 7,000 workers. No one reported for work at either of the mine’s two shafts.

According to the National Union of Mineworkers (NUM), as reported in South Africa’s Business Day, “the company had managed to get one shaft working on Wednesday morning, but the second shaft remained closed.”