We really don't invest in mines unless we know that we have a mine with a long life and a low cost—and that position in the first quartile of the cost curve. That is absolutely key. We won't invest if we don't have that assurance, because we know that fundamentally it wouldn't survive during any trough in commodity prices. That's one of the key things that we always need to do.
If we work that way, we can plan a lot better for the full life cycle of the mine, from creation to closure. As a mining company, we always try to work that way.