The property is underlain by Tertiary Masset Formation rocks consisting of dacite flows and tuffs, andesites, rhyolites, and feldspar porphyries. The volcanic units generally dip to the west and are unconformably underlain by sandstones and shales, probably of the Lower Cretaceous (Albian age), Queen Charlotte Group, Haida Formation.
A major northeast trending fault (Sams fault) and related shears cut the rocks. The shear zones offset the stratified rocks and control mineralization. Associated with the shear zones are strong argillic alteration, kaolinitic clay development, minor silicification, and varying propylitic alteration.
Several fault controlled mineralized zones, up to 6 metres wide, occur in hornblende needle andesites. The andesites are clay altered, locally silicified, and contain disseminated and fracture filled pyrite and arsenopyrite. A 5 metre wide fault zone assayed 0.74 grams per tonne gold, and a 0.5 metre zone assayed 4.46 grams per tonne gold. A clay altered wallrock sample assayed 1.57 grams per tonne gold (Assessment Report 9028).
A drill hole, 700 metres to the south west, intersected gold mineralization associated with a fault zone containing pyrite, stibnite, pyrrhotite and arsenopyrite in strong clay-altered and brecciated dacite/latite porphyry. A 3.98 metre fault zone assayed 4.85 grams per tonne gold (Assessment Report 12208).
Drilling over a 900 metre by 300 metre area between 1983 and 1988 encountered a high-level fine-grained feldspar porphyritic diorite/granodiorite. This intrusive is weakly to moderately clay carbonate altered and, locally, weakly silicified. The body contains disseminated, fracture and fault gouge controlled pyrite, arsenopyrite and possibly stibnite. Higher gold values occur in or near fault zones where sulphide content increases. One of six drill holes returned a weighted average of 1.44 grams per tonne gold over 4.09 metres (Assessment Report 17585).
City Resources Canada Ltd. drilled six diamond drill holes totaling 439.7 metres in 1988.