The Edye Pass mine is located in the Refuge Bay area on North Porcher Island about 36 kilometres south-southwest (208°) of Prince Rupert. The Porcher Island mine (103J 017) is 500 metres south of Edye Pass.

A quartz diorite stock of the Tertiary-Jurassic Coast Plutonic Complex intrudes chlorite schist and metasediments of probable Paleozoic-Mesozoic age. The stock is about 2.8 kilometres in diameter, with a 300-metre wide outer hornblende quartz diorite phase and a quartz diorite core. All rocks are intruded by mafic dikes.

Several east trending, steeply north dipping quartz veins, containing auriferous pyrite lenses, occur in the hornblende quartz diorite. The veins seldom exceed 120 metres in length and 1 metre widths. The veins occur in fractures and northeast shear zones related to flow lines within the northern part of an arch of flow layers having a 020 degree striking, 85 degree southeast dipping axial plane.

Small amounts of sericite, ankerite, calcite, chlorite and chalcopyrite occur in the veins. Under the microscope, tetradymite can be seen accompanied by free gold. Assays of a 1-metre wide vein yielded 29 grams per tonne gold and 10 grams per tonne silver (Minister of Mines Annual Report 1935).

The Edye Pass mine operated from 1919 to 1939. See also Porcher Island (103J 017).

Early exploration of Porcher Island began in 1916. Records show that mining from 1919 to 1939 resulted in 61,567 tonnes of ore yielding 639,914 grams of gold, 225,994 tonnes of silver and 4161 kilograms of copper from the Surf Point and the Edye Pass mines (103J 015). The mines produced ore from near-surface workings between 1919 and 1939, when Reward Mining Company built a 50 ton-per-day mill to replace a smaller structure that burnt down the previous year. The operation probably closed as a result of staff shortages induced by the war. The Surf Point mine operated between 1934 and 1937 (inclusive) and the Edye Pass mine operated from 1919 to 1939.

Between 1975 and 1994 several mining companies, including Tombil Mines, Banwan Gold Mines and Cathedral Gold Corporation conducted exploration and developmental work on the Porcher Island gold mine property. From 1975 to 1988, extensive exploration by E & B Explorations Inc. and Cathedral Gold Corporation resulted in a drill outlined mining resource at Porcher Island (103J 017). A deep drilling program indicated the potential for additional tonnages to a depth of 305 metres below surface in the AT zone.

The past-producing Surf Point/Edye Pass mines on Porcher Island is presently (August 2000) owned by Cathedral Gold Corp. and was, until recently, under option to Tetra Metals Ltd., who were unable to attract the financing.

In 2005, Cross Lake Minerals Ltd. entered into an option agreement to earn a 65 per cent working interest in the Porcher Island gold property from Imperial Metals Corporation. Cross Lake commenced a surface diamond drilling program to extend the area of known mineralization at the northern end of the AT zone (103J 017). Drilling in December 2005 totalled 571.9 metres of NQ2 core size in three holes to verify gold mineralization identified by previous operators on the eastern side of the AT zone.

In 2015, Imperial Metals Corp. conducted an exploration program to locate old showings on their Porcher Island property. The program included 9 rock samples from showings, 32 soil samples and 12 stream sediment samples. The highest rock sample sample #780401 with 45g/t Au gold over a 45 centimetre width was located 60 m west of the drill pad where earlier exploration was conducted on the Cedar Vein system 200 m east of the historic Dawson workings in the area of the lineament of the Edye Shear zone. This location is approximately 400 metres southwest of the Edye Pass Mine. The stream sediment sampling proved successful in delineating the Edye Shear, a known gold bearing area, as a gold target (Assessment Report 35801).