It's a sliding scale. I don't have the exact numbers with me, but it's approximately 5% tax. That's a mining tax in addition to the profits tax, of course, that will be paid on normal corporate profits. There's also a mining tax that's payable directly on the mining revenue.
Evidence of meeting #14 for Natural Resources in the 41st Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was project.
A recording is available from Parliament.