We are grateful to our colleagues and the scores of volunteer members of Mine Rescue Services from across South Africa for their unwavering commitment to the rescue operation," Harmony chief executive Peter Steenkamp said. "These rescue teams have demonstrated the utmost professionalism and courage under exceptionally challenging circumstances. We thank the Department of Mineral Resources (DMR), the Association of Mineworkers and Construction Union (Amcu) and the National Union of Mineworkers (NUM) for their collaboration that has made this possible." Steenkamp said investigations into the incident, involving representatives of Harmony Gold, organised labour and the health and safety directorate of the DMR will take place. Harmony Gold said it was planning a memorial service for Monday.