In its statement, Palabora Copper said that "mine management, officials from the Department of Mineral Resources and organised labour are currently on the mine investigating the cause of the incident".
South Africa has been rocked by several fatal accidents at its economically vital mines since the beginning of the year.
Four miners were killed following an incident at a gold mine operated by Sibanye Stillwater last month.
Earlier this year, 955 workers at another Sibanye gold mine were trapped underground for more than a day after a power outage caused by the storm. They were rescued unharmed.
(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)