The Yak South showing is located about 80 kilometres south of Whitehorse, west of Partridge Lake. There are several other similar veins in the area (104M 066 and 067).

The 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 area of the Yak South showing to be located within a Late Cretaceous pluton near its eastern contact with 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 500 metres to the northeast of Yak South 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 2-metre-wide quartz vein is mineralized with galena, arsenopyrite and sphalerite. The vein is hosted in hornblende biotite quartz monzonite and seems to be associated with Eocene rhyolite dikes. The highest-grade sample (63815) assayed 0.012 gram per tonne gold, 20.2 grams per tonne silver, 0.1839 per cent lead, 0.2760 per cent zinc and 0.0210 per cent copper (Assessment Report 18176).