Camped at Grass Lake and got an early morning start. Threat of afternoon snow and lightning, but never produced while I was up there. I mis-identified Mt Irvine, but it was an easy traverse to the true summit. I was very confused by the traverse to Mallory and had to go back and forth to find the right way. I was following a trip report found on summitpost, but was having a hard go of it, then I realized that the poster did not start from Richins Pass, but from the chute I later descended to get back to the bowl. If you start from Richins Pass, there will be more class three that takes you on both sides of the ridge. Once I passed the chute that the posters ascended, then I stayed on the west side until I summited.