A  magnitude-5.3 earthquake shook buildings in Johannesburg and surrounding areas in South Africa’s most populous province on Tuesday, killing one person and injuring at least 17 at mining operations near the epicenter in Orkney, 170 kilometers (105 miles) southwest of Johannesburg.

AP quoted Werner Vermaak, a spokesman for emergency responders working in the Orkney area, saying that a man died when a wall of a disused mining building fell on him. Mine managers ordered the evacuation of workers from shafts, Vermaak added.

Mining company AngloGold Ashanti said 17 employees at two of its mines in the Orkney region sustained minor injuries, while power supply was temporary cut there. Quakes are a concern to mining companies that operate around Johannesburg, the biggest city in Gauteng province.