At 8200' on Argonaut's S route you face the only challenge - getting onto the summit ridge. There are three gully's to choose. The leftmost (1) is easy to mid class 5. The middle (2) looks quite hard. The rightmost (3) is the obvious route - class three with one exposed class 4 move (*) from the gulley rightward to a small rib, when bypassing a chockstone.