The Ridge occurrence lies within complexly folded Upper Triassic Vancouver Group, Quatsino Formation limestone near its contact with Lower Jurassic Bonanza Group tuffs. These rocks are intruded by diorite of the Early to Middle Jurassic Island Intrusions.

Magnetite mineralization occupies the south flank of an anticlinal structure. The magnetite is crystalline to massive and free of visible sulphide or skarn minerals. A few limestone inclusions and two 1.2 metre wide feldspar porphyry dykes are present. Nearby tuffs are pyroxene altered.

The magnetite body measures 91 by 15 metres. Drilling has indicated limited depth extension. Minister of Mines Annual Report 1962, page 103, estimates 45,359 tonnes are present.

Assays of 4 samples of magnetite gave 67.72 to 68.84 per cent iron, 0.002 to 0.004 per cent titanium oxide, 0.003 to 0.02 per cent sulphur, 0.006 to 0.014 per cent phosphorus, 2.12 to 3.08 per cent silica and 0.039 to 0.052 per cent manganese (Bulletin 27, page 128).

Bedding around the occurrence is obscure, but the limestone appears to dip 50 degrees south beneath the tuffs.