The Federal Government has secured the support of key independents Tony Windsor, Rob Oakeshott and Andrew Wilkie for its mining tax.
The independents have secured a $200 million program to examine environmental concerns over coal seam gas mining and an increase in the tax threshold from $50 million to $75 million for small companies.
But the passage of the bill is by no means assured.
The Greens, who have threatened to block the legislation if the tax threshold is increased, are insisting the foregone revenue of $20 million a year be made up by other means.
However the support of the independents is a big boost to Julia Gillard's Government, which is trying to get the tax through the Lower House before Parliament rises for the year on Thursday.
It has been buoyed by Labor Party-commissioned research showing 56 per cent of people do not think average Australians are benefiting from the resources boom.
The Government has agreed to a demand by Mr Wilkie to lift the tax threshold at which the tax will apply to $75 million from $50 million and phase in another increase to $125 million.
Mr Wilkie had expressed concerns about how the tax will affect small miners, a concern shared by Western Australian independent Tony Crook.
The Tasmanian MP says 20 to 30 companies will pay the tax when it reaches the $125 million threshold.
"That will go some way to making for a fairer tax for the small mining companies," he said.
"At the end of the day they are the companies that are going to become the big companies."
Mr Wilkie said he was unable to negotiate any change to the depreciation provisions, but accepted the Government had negotiated in good faith.
But Mr Crook says he will not be supporting the tax and argues the Government should consider amendments to protect small miners.
"Some companies may choose to put their projects on the backburner or not proceed at all," he said.
"This will have a massive detrimental affect. There should be every inducement to keep these mining companies going and keeping people employed."
Sticking points
One of Mr Windsor's key sticking points was a commitment that any decisions about coal seam gas projects are based on rigorous scientific evidence.