I smashed a few ribs in a few years back after losing control and skiing into a tree and had to be snowmobiled back to the Chalet (after a good ~45 minutes of laying in the snow, mind you). My core temp dropped quite a bit but I never lost consciousness or any extremities, which I suppose is a good thing.

Good luck running in the Dam to Dam! I'll be there as well, it should be a great time!