The C 16 area is characterized by scattered mineralization that occurs in Pennsylvanian tuffaceous andesitic rock of the Stikine Assemblage that have been intruded by granite or diorite possibly related to the Middle Jurassic Three Sisters Plutonic Suite or the Middle to Late Triassic Stikine Plutonic Suite (Map 17 (H-72-9), Assessment Report 3984B). Late Devonian granite of the Forrest Kerr Plutonic suite is mapped in this area as well.

At this occurrence, mineralization is hosted by both andesitic and dioritic rocks. Quartz and quartz-calcite veins are associated with dominant northeast shears. These are found to contain chalcopyrite, bornite, magnetite, hematite and pyrite. Epidote and chlorite are also associated with these shears.

Refer to IN 32 (104G 080) for details of exploration work completed on the In, Out and C claims by Hecla Operating Company, from 1971 to 1973 inclusive.