I don't see what you mean by future significant value and no additional cost.CUU has a 25% working interest, which means they would have to pay for 25 % of the mine and certainly own that much, with profits subject to the Royal Gold and Liard NPI's. Teck has agreed to loan the money if required, which is essential since CUU has no income and would struggle to borrow from a bank. CUU may also not get any further cash payments directly if Teck has significant pre-spend costs , which they have incurred on QB2. CUU has to decide if they will sell sooner(after a development plan is announced) or later( after the mine is built). There will be years of time between those stages. And yes it's possible Teck would prefer to buyout CUU but it will be at Teck's price unless CUU can generate some leverage, such as finding another buyer.