At the Kootenay River (West Side) occurrence, a ridge of coarse-grained, light grey limestone of the Mississippian Rundle Group lies along the southwest side of the Kootenay River, 3 to 7.5 kilometres northwest of Wardner. The limestone is folded about a northeast plunging syncline. A grab sample of the limestone contained 52.46 per cent CaO, 2.77 per cent MgO, 0.14 per cent SiO2, 0.09 per cent Al2O3, 0.07 per cent Fe2O3 and a trace of sulphur (CANMET Report 811, page 202, Sample 69).