I'll ask Alistair to give you the specifics, but what I can say is that in terms of our economic analysis or feasibility study on closed containment, we found the two big costs that really make it quite different. One was that the original capital cost was enormous for the closed containment, and the other is that you have to be close to a power grid to keep the water temperature at a certain level for these gigantic tanks—and this takes an enormous amount of power.
I'll ask Alistair, who is currently leafing through the study to find the answer to the question--