A Nepalese Sherpa who climbed Mount Everest 19 times has gone missing on another Himalayan peak. Chhewang Nima was struck by an avalanche near the summit of Mount Baruntse, his climbing agency said.He was fixing ropes at an elevation of 7,045 metres while guiding a private expedition trying to reach the 7,129 metre peak. A helicopter will join the search for him today if high winds die down.The other climbers searched for Mr Nima after the accident on Saturday but were unable to find him. A helicopter has been sent to the team's base camp but was unable to take off yesterday because of strong winds.