Unnamed (northwest of Otter Lake)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Zn
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-2
Latitude 60.4342
Longitude -147.6771
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the SW1/4 section 14, T. 4 N., R. 10 E., of the Seward Meridian. This is about 1.2 miles northwest of Otter Lake. A 5-foot adit was driven into a cliff face at 1,300 feet elevation. This is location 122 of MacKevett and Holloway (1977), location 200 of Cobb and Tysdal (1980), and location S-80 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The country rock in the area consists of greenstone and pillow basalt of the Orca Group of early Tertiary age (Cobb and Tysdal, 1980). The greenstone strikes N10-25W and dips nearly vertical. A 5-foot adit cuts an iron-stained zone that contains less than 1 percent pyrite (Kurtak and Jeske, 1986). A single random chip sample of the iron-stained zone contained 145 ppm copper and 65 ppm zinc (Kurtak and Jeske, 1986).
Geologic map unit (-147.67909730403, 60.4335958653545)
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 Workings consist of a single 5-foot adit driven into a cliff to investigate an iron-stained zone (Kurtak and Jeske, 1986). A single random chip sample of the iron-stained zone contained 145 ppm copper and 65 ppm zinc (Kurtak and Jeske, 1986).
Indication of production None

References

MRDS Number A010354

References

Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 12/15/2000