This particular JV, under clause 15.1, replaces the current agreement and is essentially an opportunity to change any details if they both agree. It would be the agreement that carries them through the earn-back period. They don't need to worry about the earn-back percentage because once Teck earns back their declared amount they will need an entirely new JV anyway. This JV covers the interim period between the feasibility delivery and the completion of earn-back.
Even though it is meant to be very similar to the one currently written it would still take some time to write up and have various legal people review. Teck is obliged to produce it within 60 days even if they don't have to agree within that time period. I hardly think Teck will spend time working on this when they could simply buy us out and rip the whole thing up.