Geologic descriptionThe rocks in the vicinity of this occurrence consist of metabasalts of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991); earlier the rocks were mapped as Mankomen Formation (Rose, 1967). A pyritic unit of the Nikolai Greenstone extends for more than a mile along strike; it is cut by intermediate and mafic dike rocks. The pyritized rock possibly contains a trace of chalcopyrite. Grab sample 6E534 contained 0.02 ounce of gold per ton, 0.18 ounce of silver per ton, and a trace of copper (Rose, 1967, table 5). |
Geologic map unit |
(-144.894029861057, 63.2153045198726) |
Mineral deposit model |
Basaltic Cu (Cox and Singer, 1986; model 23). |
Mineral deposit model number |
23 |
Age of mineralization |
Post-Late Triassic, on the basis of the age of host rocks. |
Alteration of deposit |
Sulfidization of metabasalt. |