A fire at a coalmine in Victoria has finally been extinguished, 45 days after a bushfire ignited coal inside the mine. However, while the fire itself is out, firefighters will keep a watch on hot spots, the Victorian Fire Services commissioner, Craig Lapsley, said.

The fire had been raging since February 9, when a bushfire that began in nearby farming country spread to the open-cut mine, which provides brown coal to Hazelwood power station.

The nearby town of Morwell was choked with acrid smoke for weeks, giving rise to concerns about human health, and forcing some residents to leave.

Mr Lapsley said there was no danger the fire would spread further, or would cause more problems in Morwell.

"It's been a huge event," he said on Tuesday. “The biggest concern was the impact on the Morwell community, but we certainly had some issues with the complexity about how we have had to manage firefighters and the mine's people over that period.

"It has been a very complex fire; something the world has watched and something that has challenged us, but we have come through. We said that we would put out this fire and we have been successful in achieving that," he said.

"There will be continued works with CFA [the Country Fire Authority] and the mine to make sure that there are no other hot spots that might occur over the next period," Mr Lapsley said.

At the height of the blaze, 65 fire trucks from five states and territories were deployed to fight the blaze near Morwell, 140 kilometres south-east of Melbourne. All interstate crews have since returned to their bases.

The fire authority would now focus on having a state government-appointed board of inquiry into the response to the mine fire, including the firefighting systems maintained by the mine's owner, GDF Suez, Mr Lapsley said.