South Africa's Department of Mineral Resources warned that the Optimum coal mine will be suspended should its managers fail to comply with the site's social and labor plan, Bloomberg News reported Feb. 20, citing an emailed statement from the department.

The mine was given 60 days to achieve compliance or face suspension.

In 2015, Oakbay Investments Group's Tegeta Exploration & Resources Ltd. acquired the mine from Glencore Plc for 2.15 billion South African rand.