The Urn 4 showing is hosted by a pink coloured, very fine grained siliceous volcanic rock of the Lower Jurassic Telkwa Formation (Hazelton Group). Fracture surfaces contain malachite and azurite with occasional chalcopyrite and pyrite. A weighted average of 10 samples collected from a semi-continuous outcrop approximately 32 metres long was 0.35 per cent copper and 26.7 grams per tonne silver (Assessment Report 19487, page 4).