|Quadrangle map, 1:250,000-scale||GU|
|Quadrangle map, 1:63,360-scale||C-3|
|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 descriptionThe 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.|
|Workings or exploration||Many small prospect pits (Rose and Saunders, 1965; Mulligan, 1974).|
|Indication of production||None|
Additional commentsSee also GU006 and GU007.
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Gulkana quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1247, 36 p.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Mulligan, J.J., 1974, Mineral resources of the Trans-Alaska Pipeline corridor: U.S. Bureau of Mines Information Circular 8626, 24 p., 9 sheets, scale 1:250,000.
Richter, D.H., and Matson, N.A., Jr., 1972, Metallic mineral resources map of the Gulkana quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-419, 1 sheet, scale 1:250,000.
|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|