The Yak showing is located about 80 kilometres south of Whitehorse, west of Partridge Lake. There are several other similar veins in the area (104M 067 and 068).

The Yak area is underlain by rocks of the Bennett Lake Caldera Complex. The complex consists of two nested calderas, an eroded structural dome and a thick succession of pyroclastic and epiclastic rocks. The complex is surrounded by granitic rocks containing pendants. The caldera is located near the eastern contact of the Coast Plutonic Complex and the Whitehorse Trough.

Regional mapping shows the Yak showing as occurring in a Middle Eocene pluton consisting of granite and granodiorite. A small stock of the Paleocene to Eocene Sloko-Hyder Plutonic Suite, consisting of high-level quartz phyric, felsitic intrusive rock is mapped about 750 metres to the east of the Yak showing, intruding the Middle Eocene pluton.

Exploration began in the Partridge Lake area in 1979 when E & B Exploration Ltd. ran a regional exploration program for uranium. Doron Explorations Ltd. acquired the claims, now called the Golden Partridge property, and conducted a reconnaissance geological and geochemical program. A brief prospecting program was undertaken in 1987. Prospecting and sampling were conducted in 1988.

A 20- to 150-centimetre-wide quartz vein is mineralized with galena, pyrite, arsenopyrite, sphalerite and chalcopyrite. The vein is hosted in hornblende biotite quartz monzonite and seems to be associated with Eocene rhyolite dikes. A chip sample (63826) across 150 centimetres assayed 0.044 grams per tonne gold, 25.2 grams per tonne silver, 0.0051 per cent lead, 0.0044 per cent zinc and 0.0048 per cent copper (Assessment Report 18176).