The unrealised jewel in the Lonmin crown, the partially developed K4 mine, is back on the table as the new owner and world’s largest source of platinum group metals (PGM) considers spending R3.9bn to finish it.

To give a sense of how important K4 is for Sibanye-Stillwater, the company’s latest reserves and resources update for its PGM and gold assets shows its promise...

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