Representatives of the Queenstown Lakes District Council and the Otago Regional Council and geologists will inspect the site by helicopter today, after receiving calls from members of the public concerned about movement in the rock face.
The track was off limits to the public yesterday, after geologists expressed concern about the stability of land next to the Shotover River.
The Moonlight Track is believed to be a mixture of private and Department of Conservation land.
A nearby landowner witnessed the slip on Monday.
The slip is located 2km upstream from the Edith Cavell bridge on the Queenstown side of the Shotover River, near Arthur's Point.
"It is not unusual for the area but it has undergone impressive movement," regional council environment engineering and natural hazards director Dr Gavin Palmer said.
The rock moved 200mm vertically and horizontally during a two-hour period yesterday, with small amounts of debris falling 200m into the Shotover River.
"It has the potential to cause blockage of the Shotover," he said.
Dr Palmer said the large slip was not unusual for the area, and might have been caused by heavy frosts.
Surveyors were monitoring the movement, and more measurements would be made today, "providing it is still there", he said.
"Otherwise, we will be measuring the hole."
Queenstown Lakes District Council emergency management officer Brenden Winder said he measured the hole in the rock face as being 1.8m in February.
"It is now larger than my 6m tape measure, so there has been a lot of movement."
The area was popular for adventure tourism, and two white-water rafting operators had temporarily suspended operations there, he said.
