Robert Albert Steane
Analyst
That's a good question, Ralph, and I'm not sure I could, off the top of my head, give you an answer. It -- overall, it's -- let's say, at McArthur River, it takes -- it's a different ground. It freezes easily, a bit more readily. It's about 6 months to establish a freeze wall. At Cigar Lake, we're seeing -- to establish a block of frozen ground in the 2 to 3 years. What we're seeing at Cigar Lake is much more complicated geologically than McArthur River, especially with respect to freezing, and it's to do with the amount of clay alteration. And we're seeing -- and from all our surface holes, we've got a lot of 5-meter spacing, a lot of detailed geological information. And the more clay alteration we see, clay alteration, it means more moisture. And more moisture, it means longer time. So we see for a large block, which was a block freezing at Cigar, it's typically -- we establish a big block area, and then it takes us a couple of years. So we need to be a couple of years ahead of our mining to get that, to be there, to be ready for our mining. In the short term, like those diagrams that I looked at and the peninsula area that I've outlined, that's a matter of months to close that, and then it opens up a mining area.
Ralph M. Profiti - Crédit Suisse AG, Research Division: I see. Okay. That's helpful. And maybe one for Tim or Ken, and this is in reference to the language in your MD&A about meeting delivery needs with some inventory draw and some market purchases. My question is, what are your inventory levels now? I recall a figure of sort of 6 months of sales as Cameco's strategy. Has that target changed? And is there a critical level where you would not want your own inventories to fall below?