The aborigines alleged that Adani was misleading the public.
An Adani spokesperson said that it was yet another attempt by activists to delay the project.
Australia's federal and Queensland governments are eager to see the mine built following the loss of more than 4,000 coal jobs over the past two years, but analysts and project finance experts believe Adani may have underestimated the challenge of raising funds for the project.
Adani has blamed opposition to its mine for delays in moving the $7 billion project to the construction phase
Was Adani able to clinch this loan merely as a result of his proximity to Prime Minister Narendra Modi?
The Adani group had applied for the Northern Australia Infrastructure Facility loan for building the 388-km rail line to connect the Carmichael coal mine to the sea port.
The $16.5 billion Carmichael coal mine project when completed would be one of the world's largest.
However, Adani Australia has clarified on its Facebook page on Monday that in terms of quality of the coal it is almost 50 per cent better than that used domestically.
The stock jumped 12.9 per cent to Rs 95.80 at Bombay Stock Exchange.
The final and last approval for the Adani group's long-delayed billion dollar mega coal mine project came weeks after a surprise election win of Australia's pro-coal ruling coalition led by Prime Minister Scott Morrison.
Adani, which already has mining and environmental licences from the state government, requires the state approvals on management plans on the endangered finch bird and groundwater in order to commence the mine construction.
The Queensland Government has declared the rail corridor as a Strategic Development Area, the statement said.
Raising the issue during Zero Hour, he said SBI has signed an MoU pledging one of the single largest loans to a corporate house despite five international banks refusing to lend to the Adani project.
Adani described the meeting as warm and productive.
The federal court in August had revoked the original approval.
The key hurdle Adani needs to clear to secure loans for the Carmichael mine, rail and port project is dredging approval to expand its Abbot Point port.
"I am proud to announce the project has Final Investment Decision (FID) approval which marks the official start of one of the largest single Infrastructure -- and job creating -- developments in Australia's recent history," Gautam Adani said.
Adani, GVK win Australian state backing to expand coal port.
Adani's plan to build one of the world's biggest coal mines has been hampered time and again.
Adani has argued that the Carmichael mine, together with its other projects in Queensland.