The Sam occurrence is located in the northern head waters of Effingham River, east of 5040 Peak. The showings are reported to occur within an area of about 300 by 600 metres, over a vertical distance of about 150 metres.

The area is underlain by volcanic rocks of the Upper Triassic Vancouver Group, Karmutsen Formation, consisting mainly of basaltic pillow lavas, pillow-breccia and massive basaltic flows. These are overlain by massive beds of limestone of the Quatsino Formation, also of the Vancouver Group. These are in turn overlain by Lower Jurassic Bonanza Group intermediate to felsic volcanics. Rhyolite and amphibolite dikes are intrusive into andesite and rhyolite flows. Granitic rock of the Early to Middle Jurassic Island Intrusions disrupts the strata.

Disseminated pyrite is the most common sulphide, occurring in andesite, rhyolite and amphibolite dikes, but most commonly in the rhyolite. Massive pyrrhotite, pyrite, sphalerite and chalcopyrite outcrop in a stream bed and chalcopyrite and sphalerite are found in skarn zones, up to 60 centimetres in width, along the base of a limestone cliff. Chalcopyrite also occurs as disseminations in occasional amphibolite dikes and in shear zones in andesite, particularly to the west of the massive sulphide showing.

In 1971, Alberni Mines explored the property. In 1984, Proven Resources completed a program of prospecting and geochemical sampling on the area as the Dollar 3 claim.