Froneman, a seasoned dealmaker, said he had "moved on" from the idea he floated two years ago of merging Sibanye with South African peers Gold Fields and AngloGold Ashanti to create a South African gold mining "champion".
Speaking on the sidelines of the Investing in Africa Mining Indaba in Cape Town, Froneman said he was focused on building a "geographically diverse green metals company".
Newmont has offered to buy Australia's Newcrest in an all-share bid valuing it at $16.9 billion. (Reporting by Helen Reid; Editing by Kirsten Donovan)