The Australian tourist rescued on Ben Lomond, near Queenstown, early this morning didn't think he was going to survive.
Police said a volunteer search and rescue team found 25-year-old Robert Galdamez wet and cold, just before 12.30am, near the summit of Ben Lomond.
He was taken to Lakes District Hospital with moderate hypothermia.
Doctors said he arrived hungry and hypothermic this morning- but is quickly recovering.
He is in a stable condition and will likely be discharged today.
He is yet to speak with police about his ordeal.
About 20 search and rescue staff, with dogs and a helicopter equipped with night vision, comb the mountain last night.
Galdamez had been missing for about 30 hours.
Earlier, his partner Tim Heritage said Galdamez was no stranger to tramping, but he was ''fearing the worst''.
Queenstown police launched a search and rescue operation on Tuesday night, after Galdamez failed to return from a day walk up Ben Lomond.
Senior Constable Terry Wood, of Queenstown, said Galdamez was last seen by his associate just after 3pm.
Galdamez and a friend had arrived in Queenstown on Monday and were scheduled to return to Australia on Saturday.
Heritage understood the pair had initially intended to walk Ben Lomond, above the Skyline complex.
''Apparently his friend only walked 30 minutes with him and didn't want to go any further, or couldn't or something, so she turned back and he went off.
''While he was walking up the mountain I was at work and I was kind of talking to him while working.''
Heritage said Galdamez had sent him some photos of ''up the top'' of Ben Lomond as well as videos of him walking up.
''It looked pretty windy,'' Heritage said.
''He did say he was getting scared and I kept asking him 'Are you all right?' and he didn't respond to my messages.''
After an hour without a response from Galdamez, Heritage contacted the tourist's friend, who said she had tried to video-chat with the missing man, but either something went wrong with the internet, or the battery on his iPad - from which he had been messaging - ran out.
Galdamez, who had been planning to trek to Everest Base Camp in December, had a history of epilepsy, Heritage said.
Galdamez was of El Salvadorean and Laotian descent, but born in Australia.
Wakatipu Tramping Club member Peter Dymock told the ODT it was ''hard to understand'' how anyone could wander off the Ben Lomond track.
The peak, almost 1750m above sea level, was a popular attraction for residents and tourists, accessible either via the One Mile Creek track, or from the top of the Skyline complex.
Dymock said the track from Skyline, where Galdamez had left, was well marked, had a good ground trail and was signposted.
Although it was ''quite steep in places'', he expected a person of average fitness would be able to complete the return trip to Skyline within four or five hours.
A side track led to Moke Lake and although it was ''not obvious'', it was signposted.
Wood said that Galdamez did not have food with him, had very little water and was wearing blue shoes, black sports leggings and a dark green puffer jacket.