Unnamed (central Chenega Island)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Cr; Mn; Ni
Ore minerals pyrite
Gangue minerals epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-3
Latitude 60.3198
Longitude -148.0619
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located on the northeast side of Chenega Peak at an elevation of about 1,660 feet. It is in the SE1/4 section 28, T. 3 N., R. 8 E., of the Seward Meridian. This is location 221 of Tysdal (1978 [MF-880-A]) and location S-87 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The occurrence consists of greenstone with remnant pillow structures that is interbedded with shale. The greenstone contains quartz stringers, epidote blebs, and traces of pyrite. The bedrock strikes N 5 E and dips steeply to the west (Kurtak and Jeske, 1986). Bedrock in the area is Orca Group of early Tertiary age (Nelson and others, 1985). Two random chip samples of quartz-epodite-pyrite blebs contained as much as 2.3 ppm silver, 520 ppm chrome, 115 ppm nickel, and 1,350 ppm manganese (Kurtak and Jeske, 1986).
Geologic map unit (-148.063974790293, 60.3192253495134)
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.

Production and reserves

Workings or exploration Two random chip samples were collected from greenstone with quartz-epodite blebs and stringers and a trace of pyrite, and from iron-stained greenstone with epidote. They contained as much as 2.3 ppm silver, 520 ppm chrome, 115 ppm nickel, and 1,350 ppm manganese (Kurtak and Jeske, 1986). Not workings or improvements are present.
Indication of production None

References