Treasury figures show the originally proposed tax would have raised A$99 billion between 2012/13 and 2020/21 but the revised tax will earn A$38.5 billion during the period, the paper quoted documents obtained from the government.
Former Prime Minister Kevin Rudd proposed the tax last year but the government watered down the tax after Julia Gillard took over from Rudd and agreed on a complex deal with mining firms.
A spokesman for Treasurer Wayne Swan told the paper the government had always been upfront that the redesigned tax would generate significantly less revenue.
The original tax was heavily opposed by mining giants such as BHP Billiton and Rio Tinto , and the mining industry spent millions of dollars on a public relations campaign which in part led to Rudd's fall.
Australia plans to return its budget to surplus in 2012/13 and Swan has repeatedly said that a shortfall in the mining tax revenue would not threaten the budget targets as spending would be cut in line with the revenue loss.















































