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.

Andesites of the Lower Jurassic Hazelton Group are intruded by granodiorites and related feldspar porphyry dykes of the Cretaceous to Tertiary Coast Plutonic Complex. North striking, east dipping quartz veins occur over a 250 metre length adjacent to feldspar por- phyry dykes within the andesites. The veins are up to 1 metre wide and contain galena, sphalerite, pyrite, tetrahedrite and chalco- pyrite. A 25 centimetre sample of the Silver Bow showing assayed 6.9 grams per tonne gold, 2880 grams per tonne silver, 50 per cent lead and 24 per cent zinc (Geological Survey of Canada Memoir 205).

The Silver Cliff showing, which is 150 metres to the northwest, is a 15 metre wide, 20 metre long quartz vein, striking 160 degrees and dipping 65 degrees east. A sample assayed 3.4 grams per tonne gold, 720 grams per tonne silver, 26 per cent lead and 8 per cent zinc (Minister of Mines Annual Report 1925).

Production from the Silver Bow claim includes 6.7 tonnes which averaged 5.9 grams per tonne gold, 1426.6 grams per tonne silver, 1.1 per cent copper, 11.2 per cent lead and 13.0 per cent zinc (Minister of Mines Annual Report 1937, page C13).