The Red Mountain showing is situated 1.2 kilometres northwest of Nickel Plate Mountain, about 3 kilometres northeast of Hedley.
This area on the south flank of Aberdeen Ridge is underlain by siltstone and limestone of the Upper Triassic Hedley Formation (Nicola Group). These sediments are intruded by dykes and sills of diorite and gabbro of the Early Jurassic Hedley Intrusions.
A fine-grained igneous rock (andesite/diorite dyke or sill?) of undefined width is mineralized with arsenopyrite and pyrite. Samples are reported to average 8.2 grams per tonne gold (Minister of Mines Annual Report 1901, page 1163).