The Alpen occurrence is located in the south eastern head waters of “A” Creek, a tributary of Raffuse Creek, at an elevation of approximately 1400 metres.

The area is underlain by a roof pendant of rhyolitic and andesitic tuff and agglomerate of the Lower Cretaceous Gambier Group. The volcanic rocks overlie Late Jurassic leucocratic granodiorite of the Jurassic to Tertiary Coast Plutonic Complex. The elongate, keel- shaped, roof pendant trends west-northwest for 2 kilometres and is up to 1 kilometre wide.

Mineralization consists of pyrite and locally associated sphalerite, chalcopyrite and galena. The sulphides occur as scattered disseminations and blebs and as narrow fracture and shear fillings with quartz in the volcanics and, to a lesser extent, in the granodiorite.

In 1982, a sample (C22B) containing thin quartz veinlets with specks of galena, pyrite and minor sphalerite, assayed 0.49 per cent zinc, 1.06 per cent lead, 2.0 grams per tonne silver and 0.18 gram per tonne gold (Assessment Report 11052).

In 1984, a rock sample (150176) assayed 0.209 per cent copper, 0.930 per cent lead and 11.2 grams per tonne silver (Assessment Report 13028).

In 2006, a sample (No.10) assayed 0.49 per cent zinc and 1.06 per cent lead (Assessment Report 29120). The following year, a rock sample (M93) from a quartz-sulphide vein assayed 0.21 gram per tonne gold, 12.3 grams per tonne silver, 0.212 per cent copper and 0.472 per cent zinc (Assessment Report 29949).

In 2013, a sample (M277) of an andesite hosting quartz veins with pyrite assayed 0.21 gram per tonne gold, 9.8 grams per tonne silver and 0.578 per cent lead (Assessment Report 34029).

Another area of mineralization, located near the saddle of a ridge approximately 600 metres to the north, consists of a granodiorite with disseminated and wispy pyrite and possible minor chalcopyrite. In 1982, a rock sample (E111) assayed 0.22 per cent zinc, 0.44 per cent lead and 4.0 grams per tonne silver (Assessment Report 11052).

During 1980 through 1982, Alpen Exploration completed programs of rock, soil and silt sampling, prospecting and a ground magnetometer survey on the area as the Ursula and Sarah claims. In 1982 and 1983, Stackpool Minerals completed programs of geological mapping, rock, silt and soil sampling and an airborne geophysical survey on the area. During 2005 through 2015, the area was prospected and sampled as the Mamquam 1-5 claims.