The Focus Mountain occurrence is located on Focus Mountain approximately 66 kilometres south-southeast of the community of Atlin.

The area is underlain primarily by cherts and argillites of the Mississippian to Triassic Kedahda Formation and altered green basalts of the upper Mississippian to Permian Nakina Formation, both of the Cache Creek Complex. Small bodies of upper Mississippian to Permian ultramafic rocks are emplaced within the Cache Creek Complex rocks. These ultramafics may be genetically related to Nakina Formation mafic volcanics (Monger, Geological Survey of Canada Paper 74-47).

Asbestos fibre (chrysotile?) occurs in serpentinite on Focus Mountain within the halos of "dynamothermal metamorphism" surrounding Tertiary granitic intrusions (Geological Survey of Canada Memoir 307). The maximum fibre length is described as nearly 1.0 centimetre, and a fair proportion of the veins carry 0.5 to 0.6 centimetre fibre. An estimate of the asbestos content, across 120 metres of exposed slope, ranged from 5 to 10 per cent (Property File Rimfire - Riordon, P.H. (1956-09-07): Report - Taku Asbestos Prospect).

In 1955 and 1956, Asbestos Corp. Ltd. completed a program of surface exploration.