Certainly, the decision to invest or not by investors and by mining companies is based on a whole host of factors, some of which are not connected to the tax system. I can only respond to this year's extension to it. You're quite right. It has been annually extended since, I believe, 2007.
With respect to the extension of this year, the overall sector has been fairly strong, but there have been recent drops in certain commodity prices with respect to base and precious metals that supported the continuation of this particular credit.