Indian mining giant Adani has scaled back its plans for a massive coal mine in Queensland as it tries to stitch up funding for the project.

The original $16.5 billion Carmichael coal mine in the Galilee Basin would have seen an output of 60 million tonnes of thermal coal per year at its peak.

Adani's proposed Carmichael coal mine. Credit:Tony Moore

That's now been scaled back to an initial outlay of less than $2 billion for the first stage of the project.

Initial output will sit at around 15 million tonnes a year, with capacity to ramp that up to 27 million tonnes.