Miners have had enough of federal parliament's obsession with taxing the industry, saying the objective now should be to make mining more internationally competitive.
The Australian Greens put forward a bill on Monday in an attempt to close a loophole in the controversial mining tax that would stop the commonwealth having to reimburse miners for any increases in state royalties.
But Minerals Council of Australia chief executive officer Mitch Hooke says fully crediting royalties was a key feature of the minerals resource rent tax's (MRRT) design, to avoid double taxation.
"Enough is enough," Mr Hooke said in a statement about what he called the continued obsession with increasing taxes on mining.
"We should be looking at how we can be internationally competitive for investment and jobs for the benefit of Australians today and future generations, rather than how we can keep carving up the pie."
But Greens deputy leader Adam Bandt said the government's admission on Friday that the MRRT raised just $126 million in its first six months, when it forecast $2 billion for the first year, showed the MRRT's design was a "dud".
"Labor's rhetoric about sharing the opportunity of the boom is an empty slogan," Mr Bandt said.
He introduced a private member's bill into parliament that would raise an additional $2.2 billion over the forward estimates and $3 billion by 2016-17.
The government came under fire during parliamentary question time over the MRRT, with Prime Minister Julia Gillard forced to back her treasurer Wayne Swan.
Opposition Leader Tony Abbott asked if she still had confidence in Mr Swan after his failures to deliver a budget surplus this financial year, to collect more than 10 per cent of forecast mining tax revenue and to deliver on the promise of 500,000 jobs in two years.
"Of course," Ms Gillard responded.
Asked whether there were plans to redesign the MRRT, Ms Gillard said the government was critical of the reckless approach of state governments increasing royalties.
"Interestingly enough, the opposition that has always criticised an efficient profits-based tax in minerals has gone tick, tick, tick to Liberal royalty increases around the country," she said.
She said the issue had been taken to the GST distribution review panel, which found the situation was unsustainable. It is now being discussed with state treasurers.
Mr Swan said the opposition's attitude was similar to that of their predecessors over the introduction of the petroleum resource rent tax that has since raised $28 billion.
He said people were entitled to some of the super profits that flowed from mining, but opposition frontbencher Tony Smith pointed out that this was only $5.50 per Australian so far.
The opposition has vowed to ditch the tax if elected to power in September.
Shadow assistant treasurer Mathias Cormann agrees that commodity price volatility and currency changes are factors that contribute to changes in revenue collections.
"It was always going to be a volatile revenue source," Senator Cormann told Sky News.
"That is why we have said all along that it was so irresponsible for the government to link ... a whole series of spending promises (to MRRT revenue)."