A Hato Hone St John spokesperson said the service was notified of the incident at 6.28pm.
“One helicopter responded and transported one patient in a moderate condition to Christchurch Hospital.”
The New Zealand Mountain Safety Council wants to remind people to familiarise themselves with safety measures while hiking.
Mt Somers’ Track is a remote two-day circuit around the mountain, linking the popular Pinnacles and Woolshed Creek huts.
The track in to Pinnacles hut, near where the child was located, is more physically demanding and requires tramping experience.
It is an area known for being more hazardous in winter and early spring, when it can get ice and snow.