The Sarah occurrence is located on the west side of a small ridge, approximately 6 kilometres south of the Tchaikazan River and west of middle Taseko Lake.
The area is underlain by volcanic tuffs and argillaceous sediments of the Lower Cretaceous Taylor Creek Group. To the south east these have been intruded by Late Cretaceous to Paleogene feldspar porphyritic intrusive rocks.
Locally, gossanous zones in a greywacke host malachite and chalcopyrite with epidote and quartz-carbonate veins. In 1980, a sample (No.1) of malachite assayed 12.6 grams per tonne silver and 1.52 per cent copper, while a sample of sandstone assayed 1.2 grams per tonne gold (Assessment Report 9561). In 1982, samples yielded up to 0.81 per cent copper, 0.16 per cent lead, 0.13 per cent zinc and 4.8 grams per tonne silver (Assessment Report 10774).
In 1983, a chip sample from an exposure near Mark Creek, approximately 1.5 kilometres to the north, assayed 0.24 per cent copper and 3.4 grams per tonne silver (Assessment Report 12105).
In 1980, the area was prospected as the Sarah claim. During 1981 through 1983, Suncor Resources completed programs of rock, silt and soil sampling, geological mapping and ground geophysical surveys on the area as the Cougar claims. In 1998, Pellaire Gold Mines completed a program of rock, silt and soil sampling on the area. In 2008, Valor Resources completed a program of geochemical sampling and geological mapping on the area.