The exact location of the Silver King showing is not known. The Silver King claims are reported to be on the west side of American Creek, about 24 kilometres north of Stewart. The camp was apparently about 3.2 kilometres north of the Mountain Boy claim (Lot 445, 104A 011).

The area is underlain by north striking, west dipping Hazelton Group rocks of the Lower Jurassic Unuk River Formation and overlying Lower Jurassic Betty Creek Formation (Bulletin 58; 63).

Argillite, exposed on the valley floor, is overlain by a sequence of tuffs and breccias which is in turn overlain by andesite lava and superimposed breccias and tuffs (Minister of Mines Annual Report 1930, page 109).

Tuff beds are, in places (especially on the Silver King M, Silver King O, Silver King Q and Free Gold Fraction claims), extensively pyritized and variably silicified. A grab sample from a typical exposure assayed 0.69 gram per tonne gold and 12.7 grams per tonne silver (Minister of Mines Annual Report 1930, page 109).

A weak shear in andesite lava, on the Silver King Fraction, Silver King Q and Silver King M claims, locally contains chalcopyrite, pyrite and hematite in a quartzose gangue. A sample across 1.2 metres assayed 0.3 gram per tonne gold, 9.6 grams per tonne silver and trace copper (Minister of Mines Annual Report 1930, page 109).

In 1930, the American Creek Mining Co. prospected a group of claims on the west side of American Creek. Several showings were reported on the Silver King claims.