More than 400 South African gold miners who remained underground for four days amid tensions between unions and the mine owners returned to the surface on Monday, with some telling AFP that workers had collapsed due to lack of food. The miners failed to emerge at the end of their Thursday night shift at Springs, east of Johannesburg, in a near repeat of a three-day protest in October, the Gold One company said. The miners all came out on Monday. Twelve were injured and were taken to hospital with injuries including fractures and cuts, said Ziyaad Hassam, head of legal affairs at the Gold One mine in Gauteng province.