Several bodies of magnesite or carbonatized serpentine are reported on claims staked by a Mr. J.J. Devitt on Mission Mountain about 1940. They are supposedly within a three kilometre radius of Shalalth, British Columbia. The serpentinite is probably related to the Permian and older Shulaps Ultramafic Complex.

The largest body is in the order of 244 by 61 metres and is oxidized to a maximum depth of 1 to 3 centimetres. Samples assay about 3 per cent lime, 0.13 per cent iron and 40 per cent magnesite (Open File 1987-13). The magnesite carries unaltered chromite as grains or small accumulations.