Michael Gordon and I climbed the Moynier Couloir on good and solid alpine ice in October 2000. I found this gully to be as good (and steep) as the legendary Mendel Couloir Right with the short rock section harder than Mendel. We soloed the first 4-5 pitches and roped about a pitch or so before the rock pitch. The climb was much easier than the descent. The N Ridge of Thompson proved to be much more interesting proposition, if you go down this way, follow the ridge way out till you see easier ground. We didn't and found ourselves in tough ground. 3 hours up, 5 hours down. Great climbing, great gully, there must be a better way down.
With P. Doucette. Snow over night covered any ice lower in the couloir but made the rock pitches interesting.
Brad Mastros and I day climbed Thompson´s Moynier couloir out of South Lake in about 15 hrs car-to-car. Conditions were good for our June 28, 2008 climb.