A St John spokesperson said at least 15 other people had moderate injuries, including head injuries that had knocked them out, and were being treated at a triage centre set up in Ohakune.
The spokesperson said that number could change, as in the chaos of the accident it was hard to keep accurate numbers.
Three helicopters were flown to the crash site on Mt Ruapehu to help transport the wounded.
The last chairlift went at 4pm, and the crowd has been steadily growing since.
Many are having to sit on the floor as they wait and plenty are arriving at the cafe soaked from the wet conditions.
Visibility at the Turoa skifield has been limited today and skiers have been asked to ski to their ability and take caution. Visibility is currently between 25m and 50m, according to the Mt Ruapehu ski report.