Unnamed

The Unnamed is a zinc and lead 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

Commodity

Primary: Zinc
Primary: Lead

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

Model Name: Skarn Zn-Pb

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Thermal metamorphism of Mississippian limestone has commonly developed coarse marble on St. Lawrence Island (Patton and Csejtey, 1980) but calc-silicate minerals or tactite have not been described.

Rocks

Name: Marble
Role: Host
Age Type: Host Rock
Age Young: Mississippian

Analytical Data

Not available

Materials

Ore: Galena
Ore: Sphalerite
Gangue: Pyrite

Comments

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Mid-Cretaceous; the marble is in the contact zone of the Taphook pluton with Mississippian limestone (Patton and Csejtey, 1980). This pluton has not been dated but it is similar to the Sevuokuk pluton on the west coast of St. Lawrence Island that has a K/Ar age of 108 +/- 3.2 Ma (Patton and Csejtey, 1980).

Comment (Deposit): Model Name = Galena- and sphalerite-bearing veins in marble. Deposit model 18c (?); Zn-Pb skarn deposits

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

Comment (Workings): Workings / Exploration = Two samples of sulfide-bearing marble contained (1) 15 ppm silver, 15 ppm copper, greater than 2 % lead, and 200 ppm zinc, and (2) 70 ppm silver, 700 ppm copper, greater than 2 % lead, and greater than 1 % zinc (Patton and Csejtey, 1971, p. C8).

Comment (Geology): Geologic Description = Thermally metamorphosed marble, cut by sulfide stringers containing galena, sphalerite, and pyrite, is exposed in the streambed (Patton and Csejtey, 1971, p. 15). Two samples of sulfide-bearing marble contained (1) 15 ppm silver, 15 ppm copper, greater than 2 % lead, and 200 ppm zinc, and (2) 70 ppm silver, 700 ppm copper, greater than 2 % lead, and greater than 1 % zinc (Patton and Csejtey, 1971, p. C8). The marble is in the contact zone of the Taphook pluton with Mississippian limestone (Patton and Csejtey, 1980). The Taphook pluton is a composite intrusion that in this area is hornblende quartz monzonite. This pluton has not been dated but it is similar to the Sevuokuk pluton on the west coast of St. Lawrence Island that has a K/Ar age of 108 +/- 3.2 Ma (Patton and Csejtey, 1980).

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): 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.

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): 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.

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