From the QB2 minority interest transaction.

Additional amounts may become payable to the extent that average copper prices exceed US$3.15 per pound in each of the first three years following the commencement of commercial production, up to a cumulative maximum of US$100 million if commencement of commercial production occurs prior to January 21, 2024, or up to a lesser maximum amount in certain circumstances thereafter. 

In summary, if the project is worth more at production, the minority interest will get their share of the upside.  Win-Win.

MoneyK