The Sweetwater copper showing is located approximately 87 kilometres east of the town of Prince George on the north side of the Fraser River, near the hamlet of Longworth and within the Cariboo Mining Division.

The region is characterized by lower Paleozoic rocks that have been complexly folded and thrust faulted, and then in turn overprinted by later normal faulting. The Nonda formation, which consists of various calcareous sedimentary rocks with folded and faulted lenses of greenstone and greenschist, is in fault contact with the McNaughton Formation (Gog Group), a package of Lower Cambrian quartzites and quartz arenites.

The Sweetwater showing occurs at the normal fault contact between the two. Mineralization consists of minor amounts of chalcopyrite in amygdaloidal greenstones.