The Patricia occurrence is located just north of the Marmot River, 6.5 kilometres east of the Portland Canal and 9.5 kilometres southeast of Stewart. The occurrence consists of several showings developed in granodiorite of the Eocene Hyder pluton (Coast Plutonic Complex) and argillite and tuff of the Middle-Upper Jurassic Salmon River and Lower Jurassic Unuk River formations (Hazelton Group).

A quartz vein, up to 0.3 metre wide in the granodiorite, has been followed by a tunnel for 34 metres. The vein, which pinches out 23 metres from the portal, strikes 013 degrees and dips vertically. It is mineralized with sphalerite, galena and pyrite for up to 9.0 metres from the portal. Samples of quartz containing galena and pyrite assayed up to 133 grams per tonne gold (Minister of Mines Annual Report 1921, page 61).

A 9.0 metre wide granodiorite dike intrudes argillite of the Salmon River Formation and andesitic tuff (greenstone) of the Unuk River Formation to the north. The dike, locally parallel to the main granodiorite contact, strikes 093 degrees and dips 61 degrees north. Quartz veinlets containing pyrite with minor chalcopyrite and galena are developed in the argillite and tuff along the flanks of the dike. Samples from these veinlets have assayed up to 6.63 grams per tonne gold equivalent (Minister of Mines Annual Report 1922, page 67).

In 1921-22, at an elevation of 487 metres or about 152 metres above the camp, a tunnel has been driven 24 metres following a small quartz vein in granodiorite. The vein has been exposed on the surface in the bluffs above the tunnel about 6 metres beyond the portal of the tunnel.

Granby Gold Inc.'s Marmot property, containing the Patricia showing, had its geology refined in 2017 by interpretation with regional airborne geophysics and again in 2018 with airborne geophysical survey data.