The Intersection Mountain showing is located approximately 180 kilometres east of the town of Prince George and approximately 58 kilometres north of the town of McBride. The showing is less than 2 kilometres west of the British Columbia–Alberta border, in the Cariboo Mining Division, and is 2 kilometres south of the Intersection Mountain Zinc showing (MINFILE 093H 135).

The region is underlain by an assemblage of sedimentary rocks that were deposited in a continental shelf environment along the western margin of Ancestral North America. This clastic and carbonate rock sequence ranges in age from Hadrynian to Upper Cretaceous and now lies within the Foreland tectonostratigraphic division of the Canadian Cordillera. Folds and southwest-dipping, northeast-directed thrust faults are the dominant structures of the region.

Phosphorite horizons are known from upper Paleozoic and lower Mesozoic strata in the region. In this area, phosphorite beds are present in the Whistler member of the Lower Triassic Sulphur Mountain Formation (Spray River Group).

At this location, near Intersection Mountain, a phosphorite horizon outcrops on a cliff face and is estimated at no more than 1 metre in thickness. Nodular phosphorites and fossiliferous phosphorites with fluorite-coated fracture surfaces were found in talus beneath the outcrops. Grab samples from this area contain between 18 and 20 per cent phosphorus pentoxide (Fieldwork 1991, page 79, sample 1251 A,B).