I'll turn it over to my colleague, Bruce Sloan.
Very briefly, there are two main tax expenditures. One of them is for accelerated capital depreciation for the oil sands area. That's about $1.5 billion over five years, over $300 million per year. That's due to be sunset by around 2014-15. Again, that's significant progress in terms of eliminating a tax measure that contributed indirectly to greenhouse gas emissions.
There is a second one for flowthrough shares for the mining sector. I'll ask my colleague, Mr. Sloan, to respond.