The Atsutla Range occurrence is located on the Tanzilla Plateau about 4 kilometres northeast of the northern tip of Kedahda Lake, 128 kilometres north-northwest of the community of Dease Lake.

A steeply dipping Upper Mississippian to Permian serpentinite body (Cache Creek Complex), about 2 kilometres long and 90 metres wide, occurs conformably to the trend of a Mississippian to Triassic metasedimentary sequence of the Kedahda Formation (Cache Creek Complex). The northwestern part of the ultramafic body consists mainly of massive serpentine. The rock is generally light grey on a weathered surface and dark green to black on a fresh break. It contains a few large relic grains of partly serpentinized olivine occurring in a fine grained groundmass of serpentine and magnetite. Locally, where the serpentinite has been sheared, it is light green and waxy in appearance. In a few places the serpentinite is intersected by narrow veinlets of cross fibre chrysotile asbestos. The southeastern part of the body lies relatively close (450 metres west) to granite of the Late Cretaceous Glundebery batholith. The serpentine in this locality has been altered to a coarse-grained rock consisting essentially of reddish brown weathering talc and rusty weathering, buff coloured carbonate.