The area is underlain by the Lower to Middle Jurassic Laberge Group sedimentary rocks of the Takwahoni Formation are unconformably overlain by Early Eocene Sloko Group rocks comprised of light-coloured rhyolite, dacite, trachytic flows, and pyroclastics.

The Zohini zone is underlain by flat lying, felsic to intermediate volcanics and volcaniclastics and has been traced over a strike length of 360 metres, varying in thickness from less than one metre to almost 15 metres. The zone contains variable amounts of pyrite, galena, sphalerite, tetrahedrite, stibnite and arsenopyrite and is associated with limonite, narrow calcite veinlets, lenses of siderite and quartz veins.

Specifically, rock types include grey-green to greyish rhyolite and tuffaceous volcanics which have undergone silicification and hydrothermal alteration. Northeast trending dolerite dykes have been mapped crosscutting the rhyolites. Mineralization occurs in shears or fracture zones in the rhyolite, and is defined by bright orange weathering gossanous zones.

Detailed mapping of the gossanous zones in 1981 indicated three distinct types: 1) A reddish rusty gossan, caused by oxidation of disseminated pyrite and pyrrhotite, or veinlets within the rhyolite, 2) A reddish to yellow gossan, caused by the oxidation of disseminated pyrite, pyrrhotite, and arsenopyrite, with or without hairline veinlets and, 3) An orange to yellow gossan, due to sulphide veins along shears hosting galena, sphalerite, arsenopyrite, pyrite, and possibly stibnite.

In 1964, the showings were staked as the Zohini 1-60 claims for New Taku Mines Limited and 11 open cuts were made across the shear zone. Zohini Mines Limited was incorporated in 1965. F'urther trenching was done in 1965 under a joint agreement with Mineral Develpments Limited, a wholly owned subsidiary of Homestake Mining Company. The weighted average of channel sampling over a 3.9 metre footwall section gave 1.7 grams per tonne gold, 617.1 grams per tonne silver, 2.1 per cent lead, 6.3 per cent zinc, and 1.5 per cent antimony. On the hangingwall section, a 1.8 metre section averaged 3.4 grams per tonne gold, 188.56 grams per tonne silver, 2.7 per cent lead, 3.3 per cent zinc, and 4.2 per cent antimony (New Taku Mines Ltd.).

The Zohini 1-14 claims were restaked for New Taku Mines Limited in 1971 as the JH 1-16 claims.

In 1981, chip samples from trenches in the Main Zohini vein contained several good assays. A 1.8 metre chip sample assayed 10.6 grams per tonne gold, 1664 grams per tonne silver, 5.12 per cent lead, 0.16 per cent zinc, and 1.89 per cent arsenic. Another 2.0 metre chip sample contained 1.37 grams per tonne gold, 256.4 grams per tonne silver, 6.1 per cent lead, 5.31 per cent zinc, and 2.43 per cent arsenic. (Assessment Report 9592)

In 1990 Ltd. Stow Resources Ltd. carried out a program of geological mapping and sampling to investigate the mineralized shear zone (Assessment Report 21121).

In 1994 Firesteel Resources Inc completed a 14-hole diamond drilling program totaling 1312.72 metres. Several holes were drilled from each of three sites positioned south of the mineralized shear zones. All of the drillholes encountered the shear zone and the best intersection was 2.4 metres of 4.73 grams per tonne gold, 600.69 grams per tonne silver, 6.54 per cent lead, 0.66 per cent zinc and 4.55 per cent antimony (Assessment Report 23858).