The Frontier showing occurs 1 kilometre west of the Lillooet River and 7 kilometres west-northwest of the north end of Harrison Lake.

The showing is hosted in a sequence of feldspar crystal tuff (greenstone) and sericite schist of the Lower Cretaceous Brokenback Hill Formation, Fire Lake Group. The unit is intruded by a Late Cretaceous granodiorite stock, to the west and south.

A west-northwest striking zone of silicified sericite schist is lightly mineralized with pyrite and pyrrhotite and, to a lesser extent, with galena and sphalerite. A grab sample, containing pyrite and galena rich veinlets up to 1 centimetre in diameter, assayed 13.5 grams per tonne silver, 0.86 per cent zinc and 1.05 per cent lead (Assessment Report 14845, p. 2-3, Sample CR-027).