Plans to review Lonmin PLC's operating structure were being discussed with unions, the platinum mining company said on Thursday.
The company said in a statement the new structure, which would probably affect 150 management positions, was part of its renewal plan announced in October.
This was part of the company's strategy to achieve "a sustainable business in an environment characterised by weak global market conditions and high input costs".
The company was aware the process needed to be sensitively managed, and said all parties were aware of the need to preserve jobs wherever possible.
Lonmin was discussing the matter with trade unions and non-unionised employees, as was required by labour law, and was looking for ways to minimise redundancies resulting from the restructuring.
"The company also proposes to engage the services of experts in the relevant fields to assist affected employees by providing counselling, financial planning advice and access to employment advisers."