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
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.
Unnamed (north of Cape Darby) MRDS details
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.
The Top Ten Gold Producing States
These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.
