Reach the Good Luck Creek basin, and Lake Anna, by ascending the scree slide upstream of Upper Deception Hut to the scrub line and then sidling at the 1400–1500m contour into the head of the creek. Above Lake Anna, gain the col at 1890m and traverse slabby rock and shattered pinnacles. If good snow ramps exist this section can be bypassed by climbing a snow lead and short couloir further left under the South Ridge. The South Ridge rises steeply to merge with the West Ridge. An excellent route. The upper ridge can be dangerously corniced under winter conditions, making it extremely hard to negotiate.
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Updated with info from https://www.arthurspass.com/index.php?page=59
A C Snowden, A S Ahnfeldt, November 1930