Unnamed (near Bull Head)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-1
Latitude 60.8598
Longitude -147.1617
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located is in the NW1/4 section 3, T. 12 S., R. 11 W., of the Copper River Meridian. The occurrence is in the shallow cove between Bull Head and Cave Point on the southern end of Glacier Island. This is location 193 of Cobb and Tysdal (1980) and location S-110 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The occurrence consists of pyrite- and chalcopyrite-bearing quartz veinlets as much as 4 inches wide in sheared, mafic sheeted dikes of the lower Tertiary Orca Group. Five grab samples from this occurrence contained from 10 ppm to 0.5 percent copper (Jansons and others, 1984).
Geologic map unit (-147.163742891531, 60.8592632559418)
Mineral deposit model Besshi massive sulfide (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b
Age of mineralization Tertiary or younger; the veins are in mafic sheeted dikes of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration The U.S. Bureau of Mines collected five grab samples that contained between 10 ppm and 0.05 percent copper (Jansons and others, 1984). No workings are known.
Indication of production None

References