Indian opposition MPs have raised concerns about using state funds to bankroll the Adani Group's Carmichael mine project in western Queensland, which they say is not viable.
During Indian prime minister Narendra Modi's maiden visit to Australia last month, Adani signed a MOU with the State Bank of India (SBI) for a $1 billion loan to fund the project in Queensland's Galilee Basin.
The Adani Group's Carmichael mine, rail and port project is worth about $16 billion and promises to create tens of thousands of jobs in Queensland's west.
But economic analysts said the project would only be viable if coal was at $100 a tonne - currently it is worth about $70 and showing no sign of rising.
Indian opposition MP Derek O'Brien raised the issue in the upper house of India's parliament last week, saying at least five international banks had refused to fund the project.
"Our understanding is these banks refused the loan, so our serious concern is why a $1 billion loan was given by SBI, knowing full well that these five banks have refused," he said.
The Adani Group believes the project is viable and wants it up and running by 2017, but India's coal minister said last month he hoped to stop imports of thermal coal within three years as domestic production stepped up.
"Two thirds of the produce of Carmichael will be imported back into India, so one of them is not talking the truth, speaking the truth. Because if India wants to reduce imports and two thirds of the capacity from the Australian mine is going to be imported back into India, it just doesn't add up," Mr O'Brien said.
And:
It was the Newman government's great hope for Queensland's economy: a proposal for Australia's biggest coal development, unprecedented in scale.