A number of marginal electorates in Queensland's coal country, including three Labor seats, would suffer if the proposed Adani coal mine is given the go-ahead, a study has found.
The report by The Australia Institute says the Adani mega-mine will have a negative impact on coal mines in the Bowen and Surat Basins.
"Seats with something to lose from Adani development include Whitsunday, Burdekin, Mirani and Keppel - all marginal seats," The Australia Institute's Ben Oquist said.
The study comes less than two weeks from the November 25 Queensland election, with the Adani mine emerging as a key issue.
Labor holds Burdekin by a slim 1.4 per cent, and Keppel and Mirani by 4.1 per cent and 3.8 per cent respectively.
Whitsunday is held by the LNP by less than one per cent.
Modelling by coal industry experts shows a limited export market means the Adani mine could cannibalise surrounding mines.
Regional hubs that host substantial fly-in fly-out (FIFO) workforces, such as Mackay and Gladstone are also at risk after Adani announced they would use Townsville and Rockhampton as its FIFO bases.
The election campaign has seen continued protests against the mine.
On Wednesday, 20 people blocked access to the railway construction site at Belyando, including three people who locked themselves to the access gates.
On Tuesday afternoon, four people were arrested at Adani's headquarters in Townsville.