The federal environment minister has avoided giving a guarantee Adani's planned Queensland coal mine would not impact the Great Barrier Reef.
But Josh Frydenberg insists conditions associated with commonwealth environmental approvals for the massive project in the Galilee Basin are strict and should protect the reef.
Labor wants the approvals re-examined in light of recent allegations Adani altered a lab report relating to a coal-water spill at its Abbot Point shipping terminal, which is a separate issue to the mine.
Adani's Abbot Point terminal would be used to export coal from the planned Carmichael mine.
"Information about a company providing false information, if that's true, is huge because the entire environmental approval hinges on accurate information being forthcoming," opposition environment spokesman Tony Burke told reporters on Wednesday.
Mr Frydenberg accused Mr Burke of "seeking to muddy the waters", saying the Abbot Point issue was a state government matter.
But asked five times whether he could guarantee there would be no adverse impact on the reef if the mine went ahead, Mr Frydenberg dodged the question.
"What I can guarantee to you is that our environment department, our authorities have looked at this issue in detail and put in place really rigorous assessment processes," he told Sky News.
"We have been very conscious of any impact on the Barrier Reef."
He also noted Adani's approvals had been unsuccessfully challenged in court.
Labor is coming under increasing pressure to formally reverse support for the mine as it battles the Greens in the by-election for the inner-Melbourne seat of Batman.
But many believe the party is keeping an eye on the impact the decision would have on a potential second by-election in the Queensland seat of Longman.
Mr Shorten is increasingly sceptical of the economic case for the mine - which has been unable to find financing from Australian banks - and suggested Adani was leading on Queenslanders with promises of "fake jobs".
But Resources Minister Matt Canavan rejected that.
"These are real jobs now and the only thing coming out of the leader of the opposition's mouth is fake news because he's a fake leader who can't stand up to the Left faction of his party ... (and) is following the tune of the Greens down in Melbourne," he said.
Labor is reportedly considering a jobs plan for central and north Queensland to announce along with its opposition to the mine.
Queensland Premier Annastacia Palaszczuk said the Indian miner had failed to meet key finance and job creation milestones.
"Each company puts in place milestones and in this case some of those milestones appear not to have been met," Ms Palaszczuk told reporters in Brisbane.
"They were given the green light about eight months ago now ... and we have been very firm in that they need to get on with those jobs."
