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Unnamed (southwest of Hill 4410)

Prospect, Inactive

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Commodities and mineralogy

Main commodities Ag; Cu; Pb
Ore minerals chalcopyrite; galena; tetrahedrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale GU
Quadrangle map, 1:63,360-scale D-1
Latitude 62.76
Longitude -144.04
Nearby scientific data Find additional scientific data near this location
Location and accuracy A swarm of veins occurs about 1/4 mile southwest of hill 4410, between 3,500 to 4,200 feet in elevation. They are in the center of the E1/2, section 2, T. 12 N., R. 7 E., Copper River Meridian. The location of the individual veins is shown by Richter (1966, fig. 5, location 6). The locality was listed as an unnamed prospect by Cobb (1979 [OF 79-1247 p.31]. It is also number 15 of Richter and Matson (1972), and number 14 of MacKevett and Holloway (1977).

Geologic setting

Geologic description

The prospect consists of a swarm of veins mostly in the contact or border phase of the Pennsylvanian to Permian, Ahtell pluton (Richter, Lanphere and Matson , 1975) near its intrusive contact with the Pennsylvanian to Permian, Tetelna Formation (fig. 2, Richter, 1966). The contact northeast of Ahtell Creek is steep. It strikes east-northeast for about one mile, and is marked by a diabase dike. The contact then turns northerly and flattens abruptly, forming a low-angle contact that places Tetelna Formation rocks above the pluton. The veins strike N20E to N80E; they are discontinuous with irregular dip. The veins are mostly quartz although locally about 50 percent of the veins are galena. Small amounts of chalcopyrite are present and tetrahedrite is found in float fragments of the veins (Richter, 1966, p. 32).
Geologic map unit (-144.042187528872, 62.7596093125141)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Age of mineralization Emplaced subseqent to or is related to the border phase of the Pennsylvanian to Permian, Ahtell pluton.

Production and reserves

Workings or exploration The veins were first discovered during geologic mapping by the Alaska Division of Mines and Minerals from 1963 through 1965. The vein swarm was then largely covered by claims after the 1964 announcement of the discovery of the Silver Shield prospect (GU014) nearby.
Indication of production None

Additional comments

Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.

References

MRDS Number A011845

References

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.
Richter, D.H., 1966, Geology of the Slana district, southcentral Alaska: Alaska Division of Geological and Geophysical Surveys Geological Report 2l, 54 p., 3 sheets, scale 1:63,360.
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.
Richter, D.H., Lanphere, M.A., and Matson, N.A., Jr., 1975, Granite plutonism and metamorphism, eeastern Alaska Range, Alaska: Geological Society of American Bulletin, v. 86, p. 819-820.
WGM Inc., 1980, 1979 Summary report of gold potential, Slana District, Ahtna project: WGM Inc., 10 p., map, scale 1:63,360. (Report held by Ahtna Mineral Co., Anchorage, Alaska).
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