Unnamed (on southeast coast of Nagai Island)

The Unnamed (on southeast coast of Nagai Island) is a gold 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

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Site Name

Primary: Unnamed (on southeast coast of Nagai Island)

Commodity

Primary: Gold
Secondary: Arsenic

Location

State: Alaska
District: Aleutian Islands

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

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Sedimentary country rocks are silicified and pyritic adjacent to the sills. Hydrothermal breccia zone in sills. Color anomaly about 3 miles north of site.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Gold
Ore: Arsenopyrite
Gangue: Quartz

Comments

Comment (Deposit): Other Comments = This site is located on land selected by the Aleut Native Corporation.

Comment (Geology): Geologic Description = At this mineral occurrence two Tertiary quartz diorite sills intrude siltstone and sandstone of the Cretaceous Shumagin Formation (Ellis and Apel, 1989). The strata strike northwest and dip 20-50 degrees to the southwest. They are silicified and pyritic adjacent to the contact. The sills crop out along the sea cliffs and beach for approximately 1600 feet. Gold is present in the sills in quartz-arsenopyrite veins and stockworks thought to be associated with northwest-trending faults and shear zones. Gold also occurs in the altered rocks adjacent to the sills and in a 100-foot wide hydrothermal breccia zone. . In 1989 Battle Mountain Exploration Company collected 61 rock-chip samples, 22 of which contained >100 ppb gold (Ellis and Apel, 1989). Fifteen samples contained 100 to 499 ppb gold, 5 contained 500 to 999 ppb gold, and 2 had >1ppm ppm gold (up to 6.55 ppm). Elsewhere on the island they also obtained scattered pan concentrate and rock samples anomalous in arsenic, gold, and mercury. Free gold was also noted on the beach at Saddlers Mistake and in several streams draining the area. Anomalous gold was also found over a 1/2 mile area associated with a color anomaly located in steep cliffs approximately 3 miles north of this site. Numerous gold anomalies were detected on the north part of the island by the U.S. Geological Survey (Frisken and Kelly, 1992).

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Ellis and Apel, 1989

Comment (Workings): Workings / Exploration = In 1989 Battle Mountain Exploration mapped and sampled this mineral occurrence. Of 61 rock-chip samples collected 22 contained >100 ppb gold. The highest value obtained was 6.55 ppm gold (Ellis and Apel, 1989). The U.S. Geological Survey mapped and geochemically sampled in the Simeonof Island quadrangle in the late 1980's (Wilson and others, 1991; Frisken, 1992).

Comment (Geology): Age = Tertiary.

References

Reference (Deposit): Wilson, F.H., Detterman, R.L., and Harris, E.E., 1991, Generalized geologic map of Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2155-A, 1 sheet, scale 1:250,000.

Reference (Deposit): Frisken, J.G., 1992, Interpretation of reconnaissance geochemical data from the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska Peninsula, Alaska: U.S. Geological Survey Bulletin 1968, 47 p., 3 map sheets, scale 1:250,000.

Reference (Deposit): Ellis, W.T., and Apel, R.A., 1989, Unga/Alaska Peninsula 1989 final report: Battle Mountain Exploration Company report, 41 p., 28 map sheets at various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

Reference (Deposit): Frisken, J.G., and Kelly, D.L., 1992, Maps showing the distribution of gold determined in various sample media collected from Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska Peninsula, Alaska: U.S. Geological Survey Map MF-2155-D, 2 map sheets, scale 1:250,000.

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