The Kleanza copper prospect (Croesus claims 1-130) covers Kleanza Mountain, about 12 kilometers north east of Terrace. Kleanza Mines Limited staked the initial Croesus group in 1965-66. During 1967-68, exploration work continued on the Croesus, Excelsior (130I 081), Gem (103I 136) and other properties.
Granodiorite of the Cretaceous to Tertiary Coast Plutonic Complex cuts volcanic rock of the Jurassic Hazelton Group. A flat- lying quartz vein, 46 centimetres wide, lies along the contact between the intrusive and volcanic rocks. The vein trends southeast and is cut by a 3.6 metre wide diorite porphyry dyke. Mineralization consists of minor sphalerite, galena and pyrite. A grab sample assayed 16.8 grams per tonne gold, 82.3 grams per tonne silver and 0.10 per cent zinc (Geological Survey of Canada Memoir 205).
of Canada Memoir 205).