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Climb a narrow couloir north of Tom Thumb Col. The couloir merges with steep, loose rock and narrow gullies but joins the South Ridge near the summit, avoiding deep chasms and steep walls at the south end of the ridge. Climb the steepening ridge, taking occasional detours to the west side of the arête and negotiating a short step just before the summit. Alternatively, the South Ridge is readily reached via scree from the western side of the col north of Pt 2315 metres.
High Thumb, South Ridge
Harold (Ned) Porter, Clive Barker, Hugh Chambers, February 1922