On valuing the 51 percent stake her government agreed to buy, she said the starting point was fair: "I really believe that both parties have a strong intention and willingness to come up with a good agreement which is benefiting Indonesians and Freeport."

As part of the deal, Freeport-McMoRan will also build a second smelter in Indonesia and plans to invest between $17 billion and $20 billion in Grasberg between now and 2031.

Speaking on whether the country would now consider rejoining the group, Mulyani said there were no current discussions.

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