Mr HOCKEY (North Sydney) (14:44): My question is to the Treasurer. I refer the Treasurer to his statement on ABC Radio National this morning that the $60 billion difference between the original mining tax and the new mining tax is 'grossly inaccurate'. He added, 'We do not do those 10-year estimates.' How does the Treasurer reconcile that spin with this Treasury document which shows a 10-year estimate for the mining tax with a $60 billion hole?