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.

Quartz diorite of the Cretaceous to Tertiary Coast Plutonic Complex intrudes volcanic rocks of the Lower Jurassic Hazelton Group. The quartz diorite is cut by northeast trending feldspar porphyry dykes which range from 3 to 5 metres in width.

Two separate, parallel quartz veins approximately 100 metres apart, cut the quartz diorite and host irregular streaks and patches of pyrite, chalcopyrite, sphalerite, galena and magnetite. The lower vein consists of two easterly converging, 5 to 75 centimetre wide veins that trend 280 degrees and dip 75 degrees north. Both veins are well mineralized with sphalerite, pyrite and minor galena. A channel sample taken across 1.0 metre, assayed 1.71 grams per tonne gold and 4.8 grams per tonne silver (Assessment Report 12072). A 70 centimetre channel sample, taken from a crosscut adit which intersected a 30 to 75 centimetre wide quartz vein which may represent the down dip extension of these veins, assayed 2.7 grams per tonne gold, 5.1 grams per tonne silver and 0.32 per cent zinc (Geological Survey of Canada Memoir 205).

Seventy-five metres west of these veins, an open cut exposed a 35 centimetre wide quartz vein which strikes 280 degrees and dips 65 degrees north. A chip sample, taken across 35 centimetres, averaged 15.1 grams per tonne gold and 13.7 grams per tonne silver (Geological Survey of Canada Memoir 205).

The upper, or main vein, consists of a single 10 to 100 centimetre wide quartz vein which strikes 283 degrees and dips between 25 and 48 degrees north. The vein is traceable for 21 metres in outcrop and has been explored by a 14.5 metre long adit. The vein consists of massive to sheared quartz variably mineralized with sphalerite, pyrite, galena and magnetite. Two channel samples taken across the vein assayed 8.9 grams per tonne gold and 0.1 grams per tonne gold across 75 centimetres and 30 centimetres, respectively (McClintock, 1987, Figure 6). In 1938, a sample of selected mineralization over a 50 centimetre width and 8 metre length assayed 24 grams per tonne gold, 34.3 grams per tonne silver and 9.4 per cent zinc (Geological Survey of Canada Memoir 205).

The Minister of Mines Annual Report for 1938, reports the following bulk shipments to the sampling plant at Prince Rupert:

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             Gold      Silver     Copper     Lead     Zinc
Weight     g/tonne    g/tonne       %         %        %
24.5 kg     11.66      58.28        tr       3.7      21.2
0.64 t      44.23      53.48        tr       nil       7.8
0.07 t      13.37      44.57       nil       2.0      16.0
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Decade Resources Ltd. re-sampled the Zymoetz (Croesus) prospect as part of their Terrace Gold property exploration program in 2019. Vein and shear zones systems at this showing are characterized by high concentrations of variable and erratic gold, silver and base metals. The strike extents of both Zymoetz (Croesus) veins are unknown and more exploration work would be required to delineate their limits. Evidence of pinching out of the Upper Vein over a distance of only about 20 metres in the underground tunnel does not exclude its further continuation in the form of other lensoidal bodies. Some evidence from the other rock samples gathered in the area indicates a potential for other mineralized veins in the surrounding region (Assessment Report 38909).