The Whitehorse Copper Belt is located west of Whitehorse and contains 30+ mines, deposits and showings. Many of the occurrences in the Copper Belt are skarns. The skarns form on or near the contact between the Whitehorse batholith and the Lewes River group. The Whitehorse batholith is commonly a grey coarse-grained hornblende granite and ranges from quartz monzonite to granodiorite to diorite. The Lewes River group contains numerous different rock types, most importantly of which is the limestone group, which is essential in the formation of skarns in the area. A small number of occurrences within the Copper Belt are vein and/or replacement and occur within the Whitehorse batholith granite.

The Little Chief deposit is within the Hancock member of the Aksala formation in the Lewes River Group. The skarn occurs along the northwest trending contact between the granodiorite and the limestone and the ore is about 600 ft. (182.88 m) along strike and an average of 80 ft. (24.384 m) in width.

The Little Chief mine display features of both endoskarns and exoskarns however, the endoskarn is subordinate to the exoskarn. The skarns of the contact zone developed in three stages: the pyroxene stage; the magnetite-andradite stage; and the serpentine-chlorite-epidote stage. The skarn is believed to have formed between 525-300°C with early contact metamorphic minerals forming in a high CO₂ environment and skarn minerals forming in a low CO₂ environment. The deposit shows characteristics of both infiltrational and diffusional metasomatic features. The deposit has been described as a bimetasomatic skarn in calcareous rocks onto which an infiltrational skarn has been imposed.

Ore minerals present within the deposit include bornite, chalcopyrite, valeriite and magnetite. Copper mineralization has been intersected at depth to 1430 ft (435.9 m). The Little Chief mine operated between 1967-1982. Total reported production, including ore from the Middle Chief deposit, was 8,536,400 tonnes. The reported grade between 1972-1982 was 1.53 Cu%, 0.75 g/t Au and 9.16 g/t Ag. There are no reported grades for the period from 1967-1971.