RE:MitsuiMitsui has 3 yrs from date of production to invest additional $50M for 10% equity interest. If they do not exerice that option, then TKO can buy back the Stream agreement (no terms specified), and the Offtake is reduced to 30%.
So the only obligation by TKO is for the first 3 years, then they have an option; although the terms of that option is not clearly stated.
A softer benefit from this arrangement is that TKO clean green copper will have a path to market that is established and helps their brand with recognition and desireability.