Unnamed

The Unnamed is a lead and zinc 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

Commodity

Primary: Lead
Primary: Zinc

Location

State: Alaska
District: Bering Sea

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: The volcanic rocks here are altered but the nature of the alteration, except for the presence of quartz veins, is not described.

Rocks

Name: Andesite
Role: Host
Age Type: Host Rock
Age Young: Late Cretaceous

Analytical Data

Not available

Materials

Ore: Galena
Ore: Sphalerite
Gangue: Quartz

Comments

Comment (Geology): Age = The andesitic volcanic rocks are mapped as part of a mid-Cretaceous assemblage of diverse lithologies and compositions, but the mineralization here could be Cretaceous or Tertiary, the age of volcanic and related hypabyssal intrusive rocks on western St. Lawrence Island (Patton and Csejtey, 1980).

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Patton and Csejtey, 1971 (PP 684-C)

Comment (Workings): Workings / Exploration = One grab sample contained 150 ppm copper, 2,000 ppm lead, 3,000 ppm zinc, and 10 ppm silver (Patton and Csejtey, 1971, p. C8). Some of the nine stream sediment samples from this drainage contain anomalous metal concentrations, 2 samples have 100 and 200 ppm lead, one has 0.5 ppm silver, one has 15 ppm molybdenum, and nine contain 700 to 1,500 ppm barium (Patton and Csejtey, 1972).

Comment (Deposit): Model Name = Polymetallic sulfide mineralization in altered volcanic rocks. Deposit model 22c (?); polymetallic veins

Comment (Geology): Geologic Description = Galena and sphalerite are present in quartz veins cutting altered andesitic volcanic rocks (Patton and Csejtey, 1971, p. C15). One grab sample contained 150 ppm copper, 2,000 ppm lead, 3,000 ppm zinc, and 10 ppm silver (Patton and Csejtey, 1971, p. C8). Some of the nine stream sediment samples from this drainage contain anomalous metal concentrations, 2 samples have 100 and 200 ppm lead, one has 0.5 ppm silver, one has 15 ppm molybdenum, and nine contain 700 to 1,500 ppm barium (Patton and Csejtey, 1972).

References

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Saint Lawrence quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-465, 1 sheet, scale 1:250,000.

Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1980, Geologic map of St. Lawrence Island, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1203, scale 1:250,000.

Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1972, Analyses of stream sediment and rock samples from St. Lawrence Island, Alaska, 1966-1971: U.S. Geological Survey Open-File Report 72-293, 78 p.

Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1971, Preliminary geologic investigations of western St. Lawrence Island, Alaska: U.S. Geological Survey Professional Paper 684-C, p. C1-C15.

Reference (Deposit): Cobb, E.H., 1980, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in fifteen quadrangles in southwestern and west-central Alaska: U.S. Geological Survey Open-File Report 80-909, 103 p.

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