Johannesburg - One of the five miners trapped in the Kusasalethu mine near Carletonville has died, Harmony Gold said on Saturday."We are deeply saddened by this tragic incident," said Peter Steenkamp, chief executive officer after the miner was brought to the surface, but declared dead. "Every effort was and continues to be made to get to all of our colleagues as quickly and as safely as possible. Our sincere condolences go to the family and friends of the deceased," said Steenkamp. The search will continue for four employees still trapped 3.1km below the surface. They are surviving on compressed air that is being pumped into the shaft they are thought to be trapped in. A tremor measuring 1.2 on the Richter scale caused sections of the gold mine to collapse at around 10:30 on Friday. There were about 3 000 miners working at the time of the tremor but all apart from the five were safe. The Association of Mineworkers and Construction Union (AMCU) has blamed the company for alleged below standard working conditions. AMCU's Gauteng West health and safety chairperson Nathi Mathunjwa alleged that temperatures underground were higher than the permitted 31 degrees, at 32.5 degrees.Operations at the mine have been suspended for the rescue.