Limestone of the Mississippian Rundle Group is exposed for 500 metres along a cliff adjacent to the Canadian Pacific Railway on the east side of the Kootenay River, 3.8 kilometres north of Wardner. The limestone strikes 040 degrees and dips 60 to 90 degrees northwest.

The limestone is brownish grey and fine grained. Chert is abundant near the south end of the exposure. A sample of the purer limestone taken along the face of a 60-metre-high hill near the railway contained 54.41 per cent CaO, 0.53 per cent MgO, 0.94 per cent SiO2, 0.23 per cent Al2O3, 0.33 per cent Fe2O3, and 0.02 per cent sulphur (CANMET Report 811, page 202, Sample 71).

At the Kootenay River (East Side) occurrence, limestone was quarried and burnt in two lime kilns near the south end of the exposure prior to 1944.

A mass of yellowish brown, sugary textured, magnesian limestone mixed with white calcite outcrops 800 metres north of the kilns. A sample contained 30.37 per cent CaO, 18.03 per cent MgO, 7.48 per cent SiO2, 0.55 per cent Al2O3, 0.55 per cent Fe2O3 and a trace of sulphur (Sample 72).

In 1987, drill hole P-6-87 was collared in limestone about 1200 metres east-northeast of the Kootenay River (East Side) limestone occurrence (Assessment Report 16329).

In 1989, drill hole A6-89 was collared in limestone about 1800 metres east of the Kootenay River (East Side) limestone occurrence (Assessment Report 19035).