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The 11-year-old was airlifted to hospital by the Canterbury West Coast Westpac rescue chopper, whose operators say it is the most serious ski accident they have attended this year, Stuff reports.
The rescue helicopter arrived at the skifield at about 12.30pm on Sunday to treat the girl, who had been skiing on the south side of Mt Hutt.
The girl received critical head injuries and a cut on the right side of her body after falling on to rocks.
The rescue helicopter also transported a 21-year-old man to Christchurch Hospital from Mt Dobson after he fell on snow and sustained serious head injuries. He had also been wearing a helmet.