Unnamed (north of Rua Bay)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Ore minerals chalcopyrite; pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-2
Latitude 60.3646
Longitude -147.6224
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located at tidewater 1.3 miles northeast of Rua Cove. It is in the SE1/4 section 12, T. 3 N., R. 10 E., of the Seward Meridian. This is location 212 Tysdal (1978 [MF-880-A]) and location S-68 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The 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.

Production and reserves

Workings or exploration 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).
Indication of production None

References