Geologic descriptionThe deposit at this prospect consists of chalcocite with minor native copper, cuprite, malachite, and azurite that occur in veins, amygdule fillings, and replacements of Triassic Nikolai Greenstone (Moffit and Mertie, 1923, p. 112-113; MacKevett, 1976). Calcite and quartz commonly accompany the copper mineralization. Strong fracturing and faulting of the Nikolai Greenstone localized some veins. The deposits were explored with two short adits. Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997). |
Geologic map unit |
(-143.941297465028, 61.7713403175545) |
Mineral deposit model |
Basaltic Cu (Cox and Singer, 1986; model 23) |
Mineral deposit model number |
23 |
Age of mineralization |
Cretaceous? Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997). |
Alteration of deposit |
Low-grade calcite, quartz, and epidote(?) veining and replacement of greenstone. Oxidation. |