London-listed Africa-focused Petra Diamonds announced on Monday that the historic Koffiefontein diamond mine would be placed on care-and-maintenance. As reported by Mining Weekly in May last year, Petra was exploring a responsible exit from its investment in the Koffiefontein diamond mining operations, together with black economic empowerment partners Kago Diamonds and the Itumelang employee trust. Petra Diamonds owns 74% of the asset, Kago 14% Itumeleng 12%.