The occurrence is on Walder Island between Cracroft and Harble- down Islands, on the boundary between the Insular Belt and the Coast Crystalline Belt.

Walder Island and the adjacent islands are underlain by andesites and related rocks of the Upper Triassic Vancouver Group, Karmutsen Formation. The andesites have undergone regional greenschist facies metamorphism.

The occurrence consists of disseminated chalcopyrite in altered andesite. Abundant carbonate veining is evident.

A single sample collected assayed 1.74 per cent copper and 13.72 grams per tonne silver (Assessment Report 14230, Figure 2A).