The Sydney 5 occurrence is located west of Sydney Inlet, approximately 6.5 kilometres north of Sharp Point.

The area is underlain by Pennsylvanian to Permian Sicker Group volcanics which have been intruded by a 2.0 by 17.0 kilometre body of diorite which strikes northwest. The intrusive is part of the Eocene Catface Intrusions (Geological Survey of Canada Map 1537A).

Locally, a mineralized shear zone, averaging 1.2 metres in width, trends east-west and lies about 400 metres east of a diorite intrusion. The shear zone occurs in dark green to grey, aphanitic to fine-grained andesite of the Sicker Group and is exposed for about 12 metres. It contains magnetite with minor quartz-veining, some disseminated pyrite and minor chalcopyrite. In 1968, a channel sample over 1.2 metres returned 0.52 per cent copper, trace gold, 0.6 grams per tonne silver, 0.01 per cent molybdenite (Assessment Report 1529).

In 1968, Cominco Limited completed a program of geological mapping and rock and soil sampling on the area as the Sydney claims. In 1970, Cerro Mining Co. of Canada Ltd. completed a program of soil and silt sampling.