Unnamed (north shore of Bay of Isles, Knight Island)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite; pyrrhotite
Gangue minerals epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-2
Latitude 60.4148
Longitude -147.6519
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located near tidewater near an unnamed creek that drains Otter lake. It is in the NE1/4 section 26 , T. 4 N., R. 10 E., of the Seward Meridian. This is location 95 of Cobb and Richter (1972), location 125 of MacKevett and Holloway (1977), location 205 of Tysdal (1978 [MF-880-A]), and location S-75 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 is composed of mafic rock that varies in composition and texture from fine-grained greenstone to diabase or gabbro. Some of the gabbro contains pyrrhotite, and a massive pyrite pod was found in a diabase dike. The pyrite pod is 0.2 by 2 feet in size. In another area gabbro enclosed a quartz pod about 10 feet in diameter that contains pyrrhotite and epidote stringers. Nelson and others (1985) mapped the bedrock as Orca Group of early Tertiary age.
Workings on the prospect consist of a 30-foot-long adit that trends N 20 W and is a few feet above sea level (Richter, 1965). The U.S. Bureau of Mines did not locate the reported adit, so they collected samples from the rock in the area. One sample was collected from gabbro and one from greenstone containing pyrrhotite blebs and quartz and epidote veinlets. Each contained less than 100 ppm base metals (Kurtak and Jeske, 1986).
Geologic map unit (-147.653878021409, 60.4141804044692)
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 on the prospect consist of a 30-foot-long adit a few feet above sea level that trends N 20 W (Richter, 1965). The U.S. Bureau of Mines did not locate the reported adit, so they collected samples from the rock in the area (Kurtak and Jeske, 1986). One sample was collected from gabbro and one from greenstone containing pyrrhotite blebs and quartz and epidote veinlets. Each sample contained less than 100 ppm base metals (Kurtak and Jeske, 1986).
Indication of production None

References