Adani's $21.7 billion Carmichael coal mine project has secured the final state and federal government approval for a railway line and construction worker's camp.

Queensland's Coordinator-General approved the project's application for a rail line into Abbot Point as well as the temporary construction of a worker's camp ahead of Adani Group chairman Gautam Adani's arrival into north Queensland on Tuesday.

The Carmichael Mine is Australia's largest mining project and proposes to ship enough coal through the Abbot Point Coal Terminal to India to generate electricity for 100 million people.

Prime Minister Malcolm Turnbull is expected to speak with Mr Adani on Monday amid mounting speculation the federal government will contribute $1 billion for the railway line.