The Adit Creek showing is located on Adit Creek, a tributary of Treat Creek on the southern slopes of Treasure Mountain. This is on the east side of Jervis Inlet, at Prince of Whales Reach.
The Copper Group of claims (092GNW017) were staked in the late 1890s. During the period of 1917 to 1922, a large amount of work was done to develop the showings. Three adits were driven into massive pyrrhotite-magnetite mineralization at 610 metres elevation. Several years later, numerous mineral showings were located between 152 and 762 metres elevation. During the early 1920s, an adit was driven at 305 metres elevation and three trenches excavated. The property then remained idle until 1966, when Gunnex Ltd. conducted mapping and sampling of all the old showings. Between 1971 and 1973, some surface mapping, soil geochemical and geophysical surveys, and diamond drilling was done by El Paso Mining. In 1987, Ashworth Explorations staked, mapped and sampled the adjacent Treat claims. In 1993, Arrowhead Exploration Services was requested by Anthian Resources Corp. to conduct a comprehensive property exploration program on the Treat claims.
Regionally, the Adit Creek showing is underlain by a series of northwest trending volcanic and sedimentary rocks which form a roof pendant of Lower Cretaceous Gambier Group rocks intruded by diorite and quartz diorite of the Jurassic to Cretaceous Coast Plutonic Complex.
At the Adit Creek showing, host strata are a series of fine grained andesitic volcanic tuffs and flows, and agglomerates with included layers of argillaceous siltstone, chert, limestone and basalt flows. The whole package has been extensively altered by a quartz diorite phase of the Coast Plutonic Complex. Andesitic tuffs and flows comprise about 80 volume per cent of all rock types in the area. The argillaceous siltstone occurs as a northwest trending, moderately to steeply dipping lens 5 to 100 metres wide. Bedding dips 40 to 70 degrees to the west or east.
The main structural features are north to northwest trending, moderate to steep dipping faults, shear zones and fractures. Alteration consists of either propylitic alteration composed of epidote and chlorite or silicification as replacement textures that occur in lenses 5 to 200 metres wide along the andesite-siltstone contact.
Mineralization and alteration at the Adit Creek showing are related to the contact between argillaceous siltstone and andesite tuffs and/or flows or shear zones. Two mineralization styles have been observed: 1) pyrrhotite-pyrite-magnetite-hematite-chalcopyrite and/or sphalerite and 2) pyrrhotite-pyrite-chalcopyrite and/or sphalerite. They occur as semimassive to massive sulphide lenses 0.1 to 14.0 centimetres wide in veins and fracture fillings. A 7-metre long adit was driven in 1917 on this mineralization.
In 1993, 10 rock chip samples were taken from the Adit Creek showing. Sample R9 yielded the highest silver and copper values of these samples, yielding 103.88 grams per tonne silver, 0.41 per cent copper, 0.02 gram per tonne gold, 0.04 per cent zinc and 0.01 per cent lead over 30 centimetres (Assessment Report 23238). The sample was taken at the contact between andesite tuff and siltstone containing 2 to 3 per cent massive pyrite and chalcopyrite. A grab sample from one these adits in 1917 was reported to have yielded 1.1 per cent copper, 41.14 grams per tonne silver and 0.68 gram per tonne gold. A 1.2-metre wide face sample from the adit was reported to have yielded 1.0 per cent copper and 27.43 grams per tonne silver.
