A band of Permian limestone of the Devonian to Triassic Harper Ranch Group is exposed for 60 metres along a road cut and continues for 180 metres southwest up the south side of the Salmon River valley, 10 kilometres southwest of Falkland.

The limestone is faulted, folded and intruded by narrow sheared dikes. Bedding generally strikes 152 degrees and dips 55 degrees northeast.

The deposit is comprised of black, fine-grained, thinly-bedded, impure limestone that is cut by narrow, white calcite veinlets.

A 60 metre long sample of chips taken along the road cut contained 39.76 per cent CaO, 0.82 per cent MgO, 25.26 per cent insolubles, 1.26 per cent R203, 0.97 per cent Fe203, 0.04 per cent MnO, 0.03 per cent P2O5, 0.06 per cent sulphur, 32.61 per cent ignition loss (Minister of Mines Annual Report 1961, p. 148, Sample 2).