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 North Star pendent is located just south of the Little Chief mine, and is located within the Lewes River limestone formation. It is located within a pendent which is contained on three sides by the diorite of the Whitehorse batholith. The mineralization at the pendent is erratic which is partly controlled by the proximity to the irregular and variably gradational intrusive contact. The copper minerals occur as grains, blebs, pods, and stringers that seem to postdate skarn minerals, and silver concentration is proportional to copper grade while gold is more erratic. These copper minerals include bornite, chalcopyrite, and minor magnetite and the calc-silicate minerals include serpentine, phologopite, red garnet and tremolite.  

In estimates from 2010, the North Star Foot Wall Zone contains 750 000 tons grading 1.5% copper. This deposit is open in all directions and total tonnage is unavailable.