Cross-fibre veins of chrysotile asbestos occur in a body of serpentinized peridotite located between Tachilta Lakes and the Tuya River.

The upper Mississippian-Permian ultramafic body is part of the Cache Creek Complex and is about 4.8 kilometres long and 0.8 kilometre wide. Chrysotile veins wider than 3 millimetres appear to be spaced at least one to every 0.8 square metre and in numerous places are found several per 0.09 square metre; the veins cover a 182 to 274 metre area. Many of the veins have a central parting, but clean 1.2 centimetre fibre is abundant. The largest fibre noted was about 3.1 centimetres in length.

In 1959, the four claim Tuya group was staked by E. Ostensoe and M. Ostensoe and optioned by Prospectors Airways Company Limited; a geological survey was then conducted.