Police are searching for overdue tramper 36-year-old Timothy Clements of Rangiora.
Timothy began a walk on Te Aroha Track toward Lake Emily on 18 May, dropped off at the start of the track on Double Hill Run Road.
He was due to get picked up at Lake Emily on Monday morning, 20 May, but did not arrive.
Police were notified that Timothy was missing around 4:45pm on Monday.
Currently, 25 LandSAR volunteers are searching in the area, including two LandSAR dog handlers and a helicopter.
Police would like to hear from anyone who was on the track over the weekend or anyone who may have seen Timothy at all.
Anyone with information should call Police on 105, referencing 190522/8605.