Deputy mayor Kelvin Clout said that staff would hold further discussions with contractors to see if some of the cost issues could be resolved. In either case, alternatives might have to be considered.
"Mauao is a precious taonga," he said. "The slip occurred in difficult terrain in a culturally and historically significant area, and it's important that we ensure the right outcome for the Base Track."
The 14m-wide slip buried the section of track after ex-Cyclone Debbie hit in April 2017.
Box steps were built up and around the slip to allow walkers and runners to complete a circuit, but these steps are not wheelchair or pram accessible and present a challenge to less-able people.
Under the current plans and timeframe, the repairs would begin later this year, with the new section of track to open sometime next year. This timeframe would be firmed up once the consent and funding process is completed.
As part of the consent process, Council has been working with Heritage New Zealand on a plan to make public the results of any archaeological discoveries at the slip site.
Heritage New Zealand senior archaeologist Rachel Darmody said, "This is an important place archaeologically and it is really good that a careful process is being followed to ensure disturbance is being kept to a minimum".
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