The Surprise Mountain area is underlain by rhythmically layered amygdaloidal, feldspar porphyritic and spherulitic basalt flows of the Upper Triassic Karmutsen Formation (Vancouver Group). Mineral- ized quartz and quartz-carbonate veins with variable sulphide content are associated with narrow, steeply dipping shear zones.

The Tip Top occurrence is underlain by amygdaloidal basalt of the Karmutsen Formation containing a lens of limestone. A grab sample from a pit in the basalt near the limestone lens assayed 1.4 per cent copper and 19.9 grams per tonne silver (Assessment Report 18672). The showing is inferred to be pyritic quartz veins mineralized with chalcopyrite, hosted in a shear structure similar to numerous occurrences nearby in the same geologic setting (Ram - 092F 530, Silver King - 092F 529).