South African iron ore producer Kumba expects daily losses of about 120,000t in export sales by its business following the declaration of force majeure by freight operator Transnet.
The notice dated Oct 7 relates to the disruption of rail and port services due to union strike action.
The Anglo American subsidiary predicts impact on production of 50,000tpd for the first seven days and about 90,000tpd thereafter.
It says contingency plans have been implemented to safeguard its assets and minimise the impact on operations.