Wakatipu rural fire officer Jamie Cowan said the Department of Conservation (Doc) would submit an investigation report and claim for costs to the association in the next "nine or 10 days".
"We sent the report because we deal with fires like this infrequently, and the NRFA deal with these fires daily," he said.
Based in Doc's Wakatipu area office, Mr Cowan was alerted to the vegetation fire which was reported on October 20 at 6.02am.
The fire was considered "under control" by 1pm, when helicopters left the scene.
Mr Cowan said two separate fires started when a tree fell on to powerlines because of "natural causes" and fuses sparked on the ground.
"We don't really know why the tree fell, but there was no foul play involved - it is quite a rocky area with shallow rooting."
High winds a few days before the fire were considered as part of the investigation but wind was not confirmed as the cause.
Mr Cowan said he could not discuss the location of the fallen tree or which properties were involved.
"It just isn't really fitting as part of the ongoing investigation. To cast speculation on the owner of the property or the people involved would be unfair," he said.
Doc reports are submitted to the NRFA when claims are considered complicated or have the potential for large claim amounts.
"There is no real time-span for these sort of things ... it is up to them how they decide to deal with it.
The party may be considered responsible and they may litigate it,"Doc rural firefighters, Queenstown firefighters, Queenstown police and staff from the Queenstown Lakes District Council, using up to seven helicopters with monsoon buckets, worked to control the slow-burning vegetation fire.
Mr Cowan said fighting the fires was expected to cost between $40,000 to $50,000.
"We have all the bills in front of us but we are still adding everything up to work out an exact total," he said.
Mr Cowan said Doc had 30 days from the day of the fire to submit a claim to the NRFA.
