More than half of the debris from the 5500m3 slip on State Highway 2 at the Waioeka Gorge has now been cleared, but the site remains active and more work is needed to get the road open.
An estimated 3000m3 has been cleared from both sides of the slip which fell following heavy rain on Friday.
Once the debris is cleared abseilers will need to scale the cliff to check for any loose rock. The rock may also need to be blasted away.
When the rock removal is complete and the site has been checked by engineers the road is expected to open to one lane.
The NZ Transport Agency's regional director, Parekawhia McLean, said it may open by the end of the week but was a fluid situation.