Unnamed (on Hogan Hill)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Pb; Zn
Ore minerals chalcopyrite; galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale GU
Quadrangle map, 1:63,360-scale C-3
Latitude 62.662
Longitude -145.479
Nearby scientific data Find additional scientific data near this location
Location and accuracy An unnamed prospect (one of the Hogan Hill prospects of Cobb, 1979 [OF 79-1247, p. 14]) is on the north end of Hogan Hill about 0.1 mile east of the Richardson Highway. The prospect is about 0.1 to 0.2 miles east of the center of section 7, T. 10 N., R. 1 W., Copper River Meridian. This prospect is locality 3 of Rose and Saunders (1965), and Richter and Matson (1972). The location is probably accurate within 0.1 mile.

Geologic setting

Geologic description

The prospect is in amphibolite on the south flank of a granodiorite intrusion that crops out northeast of Hogan Hill. The foliation in the amphibolite strikes north to north-northwest and dips steeply to the east. Small quartz veins strike east-northeast and dip 75 degrees southeast. The strike of the amphibolite is sub-parallel to the contact between the granodiorite and amphibolite (Rose and Saunders, 1965, figs 1 and 2). The amphibolite and granodiorite both form part of the Gulkana River metamorphic complex. Veinlets of quartz that contain pyrite and chalcopyrite with subordinate galena and sphalerite are sub-parallel to the foliation of the amphibolite (Rose and Saunders, 1965; Mulligan, 1974).
Geologic map unit (-145.481189427578, 62.6615653318228)
Mineral deposit model Polymetallic vein or low-grade porphyry copper? (Cox and Singer, 1986; model 22c or 18a?).
Mineral deposit model number 22c or 18a?
Age of mineralization Mineralization is probably related to a Late Jurassic granodiorite.

Production and reserves

Workings or exploration Many small prospect pits (Rose and Saunders, 1965; Mulligan, 1974).
Indication of production None

Additional comments

See also GU006 and GU007.