Currently moving drills in N.Ontario with B2. It is at the moment -36C with wind chill of -47C Brrrrrrrrrrrrrr!!.
I never leave camp for shift changes, drill moves, without full survival gear on aircraft. This includes standard 6 man, 5 day survival kit with all usual goodies, plus snowshoes, axe, saw etra food, ie granola bars and stuff that wont freeze and most importantlly far as i;m concerned, sleeping bags. and a couple of good quality lighters I also carry my Snowgoose winter coat (although too bulky to fly in) a good pair of gloves and personal pack with a change of clothes and small luxeries, ie spare couple packs of smokes. Even if shift change is only a 10 minute flight I carry everything. Once spent 6 hours on the ice with a broken machine in the Artic at -50, no fun but survival kit made it bearable and was a real moral booster (even the chicken noodle soup was starting to look good)