Unnamed (north of Cape Darby)

The Unnamed (north of Cape Darby) is a silver, tin, 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

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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 (north of Cape Darby)

Commodity

Primary: Silver
Primary: Tin
Primary: Lead

Location

State: Alaska
District: Council

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 nature of the alteration in the 5-foot-wide fault zone here is not described.

Rocks

Role: Associated
Age Type: Associated Rock
Age in Years: 92.800000+-2.600000
Dating Method: K-Ar
Age Young: Early Cretaceous

Role: Associated
Age Type: Associated Rock
Age in Years: 88.300000+-1.500000
Dating Method: K-Ar
Age Young: Early Cretaceous

Analytical Data

Not available

Materials

Not available

Comments

Comment (Reference): Primary Reference = Miller and Grybeck, 1973

Comment (Geology): Age = Not known. K/Ar ages for the Darby pluton are 88.3 +/- 1.5 and 92.8 +/- 2.6 Ma (Berry and others, 1976); this occurrence is younger.

Comment (Geology): Geologic Description = A highly altered, 5-foot-wide fault zone cuts intrusive rocks of the Darby pluton at this location. A grab sample from the altered fault zone contained 50 ppm Ag, 30,000 ppm As, 300 ppm Pb, and 500 ppm Zn (Miller and Grybeck, 1973). The gold concentration was not determined in this sample. The Darby pluton is a composite mid-Cretaceous granodiorite and granite (Miller and others, 1972; Till and others, 1986); K/Ar ages for the Darby pluton are 88.3 +/- 1.5 and 92.8 +/- 2.6 Ma (Berry and others, 1976).

Comment (Deposit): Model Name = Altered fault zone in granitic rocks with Ag, As, Pb, and Zn values.

Comment (Workings): Workings / Exploration = There are no known workings; exploration in the region may have included reconnaissance stream sediment geochemical and radiometric surveys.

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Chronological age is for the Darby pluton. This occurrence is younger.

References

Reference (Deposit): Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000.

Reference (Deposit): Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.

Reference (Deposit): Miller, T.P., and Grybeck, D.J., 1973, Geochemical survey of the eastern Solomon and southeastern Bendeleben quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 553, 115 p.

Reference (Deposit): Berry, A.L., Dalrymple, G.B., Lamphere, M.A., and Von Essen, J.C., 1976, Summary of miscellaneous potassium-argon age determinations, U. S. Geological Survey, Menlo Park, California, for the years 1972-1974: U.S. Geological Survey Circular 727, 13 p.

Reference (Deposit): Miller, T.P., Grybeck, D.J., Elliott, R.L., and Hudson, T.L., 1972, Preliminary geologic map of the eastern Solomon and southeastern Bendeleben quadrangles, eastern Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 72-256, 11 p.

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