Unnamed (southwest of Hill 4410)

Site Name

Primary: Unnamed (southwest of Hill 4410)

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Commodity

Primary: Lead
Primary: Copper
Primary: Silver

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Location

State: Alaska
District: Chistochina

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

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Physiography

Not available

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Mineral Deposit Model

Model Name: Polymetallic veins

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Orebody

Not available

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Structure

Not available

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Alterations

Not available

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Rocks

Not available

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Analytical Data

Not available

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Materials

Ore: Chalcopyrite
Ore: Galena
Ore: Tetrahedrite
Gangue: Quartz

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Comments

Comment (Geology): Age = Emplaced subseqent to or is related to the border phase of the Pennsylvanian to Permian, Ahtell pluton.

Comment (Reference): Primary Reference = Richter, 1966

Comment (Deposit): Other Comments = Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / 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.

Comment (Geology): 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).

Comment (Deposit): Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c)

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References

Reference (Deposit): 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.

Reference (Deposit): 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.

Reference (Deposit): 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.

Reference (Deposit): WGM Inc., 1980, 1979 Summary report of gold potential, Slana District, Ahtna project: WGM Inc., 10 p., 1:63,360-scale map. (Report held by Ahtna Mineral Co., Anchorage, Alaska).

Reference (Deposit): Richter, D.H., Lanphere, M.A., and Matson, N. A., Jr., 1975, Granite plutonism and metamorphism, Eastern Alaska Range, Alaska: Geological Society of American Bulletin, v. 86, p. 819-820.

Reference (Deposit): Richter, D.H., 1966, Geology of the Slana district on south-central Alaska: Alaska Division of Geological and Geophysical Surveys Geological Report 2l, 36b p., 3 sheets, scale 1:63,360.

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