The Spider occurrence is located near Moriarty Point, on the southern shore of Elk Bay.

The occurrence is described as quartz-feldspar stringers in a shear zone in a greenstone formation which contacts granodiorite. The greenstone most likely represents part of the Upper Triassic Karmutsen Formation and the granodiorite most likely represents part of the Jurassic to Cretaceous Coast Plutonic Complex.

Mineralization occurs as chalcopyrite, pyrite, magnetite and pyrrhotite within stringers and small veinlets.

The only recorded assay for the showing was taken from the footwall of the vein across 30 centimetres. It assayed 14.5 per cent copper, 68.56 grams per tonne silver and 2.0568 grams per tonne gold (Minister of Mines Annual Report 1925, page 282).