The Meosin Mountain South showing is located approximately 165 kilometres east-northeast of Prince George. The showing is 21 kilometres west of the British Columbia–Alberta border, in the Liard Mining Division.

The region is underlain by an assemblage of sedimentary rocks consisting mainly of continental margin and shelf facies rocks. This assemblage was deposited on and to the west of the Ancestral North American craton. These sedimentary rocks, for the most part typical continental shelf slope and basin facies, range in age from Hadrynian to Upper Cretaceous. Structurally these rocks are part of the Foreland thrust and fold belt of the North American Cordillera.

In this region phosphatic beds are commonly found in upper Paleozoic to lower Mesozoic rocks. These are exposed to the west of a major thrust fault that has thrust these rocks over younger, mainly Cretaceous, strata. The Cretaceous strata are exposed to the east.

Several very thin phosphatic siltstone or calcareous siltstone and arenaceous limestone occur throughout the Whistler member of the Sulphur Mountain Formation (Spray River Group). Phosphatic intervals are 0.5 to 1.0 metres thick. Phosphate is present as fluorapatite in pellets or, rarely, in nodules. Phosphate values of 6.86 and 4.35 per cent phosphorus pentoxide were obtained across widths of 50 centimetres. Sample SB 87-6 yielded phosphate values of up to 23.64 per cent phosphorus pentoxide (Fieldwork 1987; Assessment Report 30718).

Also, at the top of the Permian Mowitch Formation is a siltstone bed, 1 metre or less thick, that contains 35 to 50 per cent phosphate nodules. A sample from this bed contained 18.96 per cent phosphorus pentoxide (Personal Communication, S. Butrenchuk, 1988).

In 2013, an airphoto interpretation study was undertaken to delineate bedding trends of favourable phosphorite horizons. The area investigated extends approximately 127 kilometres from Meosin Mountain in the southwest, to Mount Pallson in the northwest.