A rock estimated to weigh between 40 and 60 tonnes has rolled about 150 metres down the side of Mount Wellington, leaving a trail of destruction.

Part of Mount Wellington's Pinnacle track will remain closed on Thursday as geologists survey the area and assess whether other large rocks higher up the mountain have been loosened.

Deputy Mayor Jeff Briscoe said it could take several days to survey the area.

"There needs to be further work up the mountain there to pinpoint exactly where the rock has come from," he said.

"It's quiet steep up there so we'll need some work over the next few days to determine where exactly it came from, but there could be other rocks in a very similar position."

The boulder left a trail of destruction when it rolled about 150 metres down the southern side of the Organ Pipes, and ended up lodged about 300 metres above the Pinnacle Road.

Part of the Pinnacle track remains closed.

Mr Briscoe said explosives may be required if the boulder is considered likely to move again.

"A rock that size would probably need to be blown up," he said.

"I can't imagine we could get a crane in here, so if it needs to be removed we would probably have to do something like that."