The search is resuming on Monday morning for a man who has been missing for three nights in freezing conditions and rugged terrain in Victoria's Alpine National Park.

Jeremy Boyden had travelled to the Dargo area with his father on Friday for some bushwalking and gold prospecting, but the pair became separated around lunchtime.

Jeremy Boyden. Credit:Victoria Police

Sergeant Anthony Dessent from Maffra police said on Sunday a massive search party has been looking for the 24-year-old, missing in the Wongungarra area with his white and brown Jack Russell named Rocky.

“It’s not hard to get separated and lost very quickly in this bush, it’s very thick, it’s very steep,” he said.