The Copper Starr occurrence is located 2 kilometres southeast of the junction of Denys Creek and the Thautil River, approximately 42 kilometres west-southwest of the community of Houston.

The area is underlain by a Jurassic dioritic intrusive rock that has intruded the lower sequence of the Jurassic Telkwa Formation (Hazelton Group), primarily andesitic tuff-breccias.

Locally, copper mineralization occurs in centimetre wide massive nodules of pyrite with chalcopyrite in a sheared, ankerite altered granodiorite and as dusty, disseminated chalcopyrite enveloping siderite veins.

In 2007, Rimfire Minerals completed a program of reconnaissance mapping, prospecting and geochemical sampling. Sampling returned up to 0.20 gram per tonne gold, 20.8 grams per tonne silver and 0.41 per cent copper over 2 metres (G001533; Assessment Report 29625).