Unnamed (north end of Blue Fiord)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals arsenopyrite; gold; pyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-4
Latitude 60.496
Longitude -148.2422
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the W1/2 section 28, T. 5 N., R. 7 E., of the Seward Meridian. The prospect is on tidewater at the head of a small cove on the east shore of Blue Fiord northeast of Division Point. This is location 173 of Tysdal (1978 [MF-880-A]) and location S-95 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The prospect consists of two quartz veins; one is exposed in the adit, and one is exposed 6 feet east of the adit. A 15-foot adit was driven on a fault that terminates a 4-inch wide, vuggy quartz vein in the adit. In addition to the that vein, there are discontinuous, one-quarter-inch wide, barren quartz stringers. The fault dips 64NW and has a 5-inch-wide gouge zone (Kurtak and Jeske, 1986). The quartz vein exposed 6 feet to the east averages 1 foot wide and contains as much as 1 percent arsenopyrite, pyrite, and pyrrhotite along with shale partings. The host rock is slate of the Orca Group of early Tertiary age; the slate strikes N 30 W and dips 75-80 NE (Kurtak and Jeske, 1986; Nelson and others, 1985). Chip samples from the two veins contained as much as 0.03 ppm gold per ton and 1.7 ppm silver (Kurtak and Jeske, 1986).
Geologic map unit (-148.244242587921, 60.4953653570817)
Mineral deposit model Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
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 15-foot-long, northeast trending adit that has a flooded winze (Kurtak and Jeske, 1986). No improvements are reported in the literature. Chip samples from the two veins contained as much as 0.03 ppm gold per ton and 1.7 ppm silver (Kurtak and Jeske, 1986).
Indication of production None

References