Two employees at South Africa’s largest gold producer, Harmony Gold, have died at the Kusasalethu mine near Carletonville in Gauteng.

In a statement, Harmony Gold says two people were fatally injured in the early hours of Thursday morning, following a seismic event resulting in a fall of ground.

The firm says while mining activity in the affected area has been stopped, safety shifts have also been enforced across the mine, pending a formal investigation.