The occurrences are located southwest of Seshal Creek, at an elevation of approximately 255 metres and at tide water, on the western shore of Princess Royal Reach of Jervis Inlet.

In this area, a small roof pendant of Lower Cretaceous Gambier Group metavolcanic rocks is bounded to the west by foliated granodiorite and to the east by massive biotite granodiorite of the Jurassic to Mesozoic Coast Plutonic Complex. Gambier Group rocks of the roof pendant have been metamorphosed to greenschist facies with biotite-rich schists the dominant rock type.

Locally, two zones of mineralization have been located. A lower zone, located at tidewater on the west side of Mendella Bay, is characterized by wispy bands and disseminations of pyrite and pyrrhotite with minor sphalerite, galena and malachite within quartz-sericite altered schist. The upper zone, located at 255 metres elevation on the steep western slope behind Mendella Bay, consists of pyrite, pyrrhotite, sphalerite, galena and chalcopyrite in bands and quartz veins.

In 1984, a sample of quartz-pyrite–altered schist assayed 5.8 grams per tonne silver, 0.04 per cent copper, 0.09 per cent lead and 0.25 per cent zinc (Assessment Report 13626).

The occurrence was originally discovered in the early 1900’s by Thomas Lillie of Pender Harbour. Work at this time consisted of prospecting and some open cuts. In 1984, Newmont Exploration of Canada completed a program of rock, silt and soil sampling, geological mapping and prospecting on the area as the Mandella 1-3 claims.