It's a bit difficult to talk about the government's motivation over time to make the credit temporary. The mineral exploration tax credit was first introduced in 2000, and was extended by governments since then on a temporary basis. The use of a temporary measure allows for an ongoing review of the economic conditions that this sector is facing. In particular, the mining sector is very cyclical in nature. I can only presume this factors into the decision to make this temporary, so it allows us to review on an ongoing basis whether the credit is still needed.
You were raising the issue of certainty for the industry. One thing I would note is that under the credit—and that's also under the flow-through shares system—the money that has been raised in the first three months of a year can be spent up until the end of the following calendar year. So it does provide a two-year window for corporations to spend on their exploration activity.