The Sin 9 occurrence is located near the tidewater on the east side of Ouokinish Inlet, near Omar Creek.

The area is underlain by block- faulted rocks of the Upper Triassic to Lower Jurassic Vancouver Group. The sequence consists of Karmutsen Formation (tholeiitic basalt) at the base, overlain by Quatsino Formation (limestone), grading into Parson Bay Formation (black calcareous siltstone and argillite), succeeded by mafic to felsic Bonanza volcanics. A quartz-feldspar porphyritic granodiorite pluton occurs to the north.

Locally, an 800 metre long zone of faulted, skarned and silicified Upper Triassic siltstone and Lower Jurassic volcanic rocks are exposed on former logging road-cuts. The skarn siltstone is cut by numerous quartz veinlets, up to 10 centimetres in width and hosts minor disseminated sphalerite. Traces of chalcopyrite occur in pods of massive fine-grained quartz-epidote.

In 1983, BP Minerals completed a program of prospecting, geological mapping and geochemical sampling on the Sin 9 claim. Chip samples had assay values up to 2028 parts per million copper (Sample 780075; Assessment Report 12745).