The Vulcan occurrence is located south west of the Nimpkish River, approximately 3 kilometres north- north west of Tsiko Lake. The occurrence lies 2.5 kilometres north west along strike of the Iron Crown mine (MINFILE 092L 034).

The area is underlain by north striking carbonates and calcareous sediments of the Quatsino and Parson Bay Formations overlying Karmutsen Formation tholeiitic basalts, all of the Upper Triassic Vancouver Group. Lower Jurassic Bonanza Group andesitic to rhyodacitic lava, tuff, breccia and minor sediments are coeval with, or genetically related to, granodiorite of the Nimpkish batholith of the Island Intrusions. Strong regional north to northwest trending faults, often defining intrusive and lithological contacts, traverse the area.

The occurrence is described as "a small outcrop of quartz and pyrite, 1.2 to 1.5 metres wide containing a little chalcopyrite and magnetite" hosted at the contact between recrystallized Quatsino Formation limestone and amygdaloidal Karmutsen andesite. In 1952, a sample of the richer pyrite material assayed 0.45 per cent copper and trace silver and gold (Geological Survey of Canada Memoir 272, page 76).

Magnetite was discovered in the area in 1897. During 1954 through 1963, Vulcan (Lot 132) crown-granted mineral claim was optioned by Nimpkish Iron Mines and explored in conjunction with the Iron Crown (MINFILE 092L 034) occurrence. During 2010 through 2012, Homegold Resources prospected and sampled the area as the Nimp, Klac and Klack claims