The area is mainly underlain by andesitic and basaltic flows, tuffs and breccias of the Jurassic Hazelton Group. The principal mineralization on the Golden Eagle property is associated with two more or less parallel shear zones approximately 21 metres apart. The zones are 0.6 to 1.5 metres wide, strike northwest and dip northeast at 30 to 75 degrees. Lenticular quartz-carbonate veins up to about 46 centimetres wide occur on the footwall side of the shear zones. Minor rhodochrosite is reported to occur in these veins. At some points the quartz is heavily mineralized with sphalerite, galena, chalcopyrite, tetrahedrite, freibergite and pyrite. High silver values are common as well as significant gold values. Minor amounts of sulphides including tetrahedrite occur as disseminations and along fractures in the altered, "bleached" volcanics. In 1986, 11.0 grams per tonne silver occurred over 0.3 metres in the altered volcanics (Assessment Report 15063).