A multi-agency search is underway for a 57-year-old hiker feared missing in the Snowy Mountains after he failed to return from a planned nine-day skiing and hiking trek.

Cameron Little left Guthega Power Station in Snowy Mountains–Kosciuszko National Park on Sept. 4 and made contact with family and a friend on Sept. 6, police said. He was due back on Saturday, Sept. 13, but did not return, prompting a land and air search involving local police, PolAir, the Rural Fire Service, State Emergency Service and the National Parks and Wildlife Service.

Searchers located a blue Mitsubishi station wagon unattended at Guthega Power Station and said initial inquiries indicate Little may still be in the backcountry area in the vicinity of Mount Jagungal. Police described him as Caucasian, about 175 centimeters tall with a medium build, fair complexion, brown hair and an unshaven grey beard. He is believed to be carrying a backpack.

Police said there are "grave concerns" for Little's welfare given his failure to return is out of character for an experienced hiker and skier. The search was ongoing on Saturday evening and was planned to resume at first light on Sunday.

Queanbeyan Police urged anyone with information about Little's whereabouts to contact the station or Triple Zero. Authorities did not release further details about weather conditions or the exact search areas.

The Snowy Mountains are a popular alpine region frequented by walkers, skiers and backcountry travellers. Searches in high-country terrain typically involve coordination between local police and specialist rescue agencies because of steep, remote tracks and rapidly changing conditions. Emergency services have advised that members of the public should not attempt independent searches but instead report any sightings or relevant information to police.

Investigations were continuing as crews scoured accessible areas and coordinated aerial and ground resources. Police said updates would be provided as more information became available.