Well, that again is a very site-specific question. It depends on the hydrography of the site and how the site was used—whether it was a large site or a small site. It could be a couple of months; it could be many months. What is done in B.C. is that if they fallow a site they have to make sure they meet environmental standards for various measures they make of the sediments.
I can't give you a specific number, but it's one of those things where you can develop some proxy measures and basically ensure you're not exceeding certain thresholds. That's the way we deal with it in B.C. We try not to say that a site has to be fallowed for a certain period of time; we look at a performance-based metric.