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 Valerie deposit occurs at the contact between the Whitehorse batholith granite and Lewes River limestone. The deposit contains minerals such as pyrite, pyrrhotite, chalcopyrite, magnetite, augite, garnet and calcite. The deposit is outlined by a geophysical anomaly that is 450ft (137 m) long. In the immediate vicinity to the north, geophysical work has identified 4 more anomalies totalling 1200ft (366 m) in 2800ft (853 m). Drilling in 1963-64 encountered copper magnetite mineralization.

Production between 1899 and 1907 totalled 127 tonnes at 1.65% Cu and 0.68 g/t Au. Elements such as cobalt, nickel, palladium and platinum were detectable during assay.