Unnamed (near Styx River)

The Unnamed (near Styx River) is a copper, silver, and tin mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Unnamed (near Styx River)

Commodity

Primary: Copper
Primary: Silver
Primary: Tin

Location

State: Alaska
District: McGrath

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Granodiorite in the shear zone is altered to quartz, sericite, albite, and iron oxide minerals.

Rocks

Name: Hornblendite
Role: Associated
Age Type: Host Rock
Age Young: Pliocene

Name: Hornblendite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pliocene

Name: Hornblendite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Analytical Data

Not available

Materials

Ore: Azurite
Ore: Bornite
Ore: Chalcopyrite
Ore: Malachite
Gangue: Albite
Gangue: Quartz
Gangue: Sericite
Gangue: Tourmaline

Comments

Comment (Workings): Workings / Exploration = Reconnaissance observation and sampling has been completed in this area (Reed and Elliott, 1970).

Comment (Reference): Primary Reference = Reed and Elliott, 1970

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

Comment (Geology): Geologic Description = Reed and Elliott (1970) reported that a northwest-trending shear zone in altered granodiorite contains as much as 10 percent pyrite and chalcopyrite. The shear zone is about 5 feet wide, exposed over a length of 30 feet, and locally stained with iron oxide, malachite, and azurite. Alteration minerals in the shear zone include quartz, sericite, albite, and iron oxides. Disseminated chalcopyrite is present in granodiorite within 10 feet of the shear zone. Float downslope of a nearby iron oxide-stained zone contains chalcopyrite, bornite, other sulfides, and tourmaline. In addition to anomalous copper values, rock samples contain as much as 700 ppm tin, and 15 ppm silver. Nearby float samples contain as much as 300 ppm silver and greater than 1,000 ppm tin. Quartz-feldspar porphyry dikes trend northwest parallel to the mineralized shear zone. The host intrusive rocks are Tertiary plutons of the Alaska-Aleutian Range batholith (Cobb and Reed, 1981).

Comment (Commodity): Gangue = iron oxide

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Tertiary. Shear zone and mineralization crosscuts Tertiary intrusive rocks.

References

Reference (Deposit): Reed, B.L., and Elliott, R.L., 1970, Reconnaissance geologic map, analyses of bedrock and stream sediment samples, and an aeromagnetic map of parts of the southern Alaska Range: U.S. Geological Survey Open-File Report 70-217, 145 p., 1 sheet, scale 1:250,000. (Also published as U.S. Geological Survey Open-File Report 413).

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Lime Hills quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-412, 1 sheet, scale 1:250,000.

Reference (Deposit): Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska; Supplement to Open-File Report 76-485; Part A, Summaries to January 1, 1981: U.S. Geological Survey Open-File Report 81-1343-A, 25 p.

Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-485, 101 p.

Reference (Deposit): Gamble, B.M., Bailey, E. A., and Reed, B. L., 1989, Gold occurrences near Snowcap Mountain, Lime Hills B-2 quadrangle, Alaska: U.S. Geological Survey Open-File Report 89-0646, 8 p.

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