Unnamed (northeast of Hogan Hill)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale GU
Quadrangle map, 1:63,360-scale C-3
Latitude 62.68
Longitude -145.45
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence (Cobb, 1979 [OF 79-1247]) is east of the Richardson Highway on the upper reaches of Haggard Creek, about 2.0 miles north-northeast of Hogan Hill (GU008). It is the same locality reported as number 2 by Rose and Sanders (1965, p.14), Mulligan (1974), Richter and Matson (1972), and MacKevett and Holloway (1977). The occurrence is in the SW1/4SE1/4, section 32, T. 11 N., R. 1 W., Copper River Meridian.

Geologic setting

Geologic description

Pyrite and traces of chalcopyrite occur on fracture surfaces in a late Jurassic(?) granodiorite pluton which is part of the Gulkana River metamorphic complex (Rose and Saunders, 1965; Berg and Cobb, 1967; and Nokleberg and others, 1994).
Geologic map unit (-145.452189895769, 62.6795666601201)
Mineral deposit model Porphyry Cu? (Cox and Singer, 1986; model 17?).
Mineral deposit model number 17?
Age of mineralization Mineralization is related to granodiorite which is probably Late Jurassic.
Alteration of deposit K-feldspar and propylitic (chlorite) alteration of granodiorite adjacent to mineralized fractures (Rose and Saunders, 1965).

Production and reserves

Workings or exploration There are old gold prospect pits in the general area but no data on the actual presence of gold (Mulligan, 1974).
Indication of production None

Additional comments

See also Hogan Hill (GU008).

References

MRDS Number A011835

References

Reporters W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (U.S. Geological Survey)
Last report date 12/20/2000