There's a sensitivity graph for the NPV and IRR in the FS. The exchange rate alone can add up to 5% more IRR depending on what rate you select. Copper prices are now almost back to the base price of $3.25. Then it's CAPEX and OPEX which have the most impact on IRR. It appears Teck is looking at a smaller scale project size targeting the Liard zone. Capital costs will certainly be lower and the strip ratio will be much better since you don't have to remove the side/top of Mount LaCasse. There will be a penalty on the fixed costs like roads, power etc. which must be amortized on a smaller project. There's a possibility they could add 5 - 10 % IRR. Teck will use conservative numbers for exchange rate and copper prices so we'll see how it works out. We didn't get any numbers from the remodel so I doubt we'll get any numbers from the desktop studies. They will likely move on with a technical report if they like the numbers.