Geologic descriptionThe occurrence is an iron-stained zone near the contact between sheared chloritic greenstone and diorite (Kurtak and Jeske, 1986). The diorite contains 1 to 2 percent disseminated chalcopyrite and pyrrhotite. One sulfide-rich zone averaged 9 inches thick and contained as much as 12 percent total sulfides (Kurtak and Jeske, 1986). Numerous shear zones as much as 18 feet thick cut the diorite and greenstone (Tysdal, 1978 [MF-880-A]). The zones trend northwest and dip nearly vertical (Kurtak and Jeske, 1986). Samples from the occurrence contained from 35 ppm to 0.45 percent copper and from 1.6 to 10 ppm silver (Kurtak and Jeske, 1986). |
Geologic map unit |
(-147.624351516331, 60.3639617108949) |
Mineral deposit model |
Cyprus massive sulfide (Cox and Singer, 1986; model 24a) |
Mineral deposit model number |
24a |
Age of mineralization |
Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age. |
Alteration of deposit |
Sheared greenstone is chloritized. |