The base case is 68% so it's a 14% gain to get to the 82% target. The NPV improvement would be more than 50%, however the Van Dyke project is on "care and maintenance" with no activity planned this year until a surface rights issue is resolved. The IRR slide 5 appears to show the incentive price required to add incremental production to fill the 4.6Mt supply gap forecast for 2027(left side figure in slide 5) with a target IRR of 15%. Teck used the left side figure in their latest presentation but not an incentive, or trigger, price. They use the C1 cash cost curve and supply/demand curves. In this slide a price of 340 cents/lb would be required to provide the required incentive. The only use I see from the slide is that it confirms the 15% IRR I use as a rule of thumb for good project economics. The desktop studies need to show an improvement over the FS IRR numbers of 10.1 % pre-tax and 8.3 % post tax. I don't know what Teck would consider good enough but they described the Zafranal 15.9 % post tax IRR as robust economics.