Unnamed (near Angiaak Pass)

The Unnamed (near Angiaak Pass) is a molybdenum, arsenic, and fluorine-fluorite 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 (near Angiaak Pass)

Commodity

Primary: Molybdenum
Primary: Arsenic
Primary: Fluorine-Fluorite
Secondary: Copper
Secondary: Silver
Secondary: Lead

Location

State: Alaska
District: Noatak

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: Porphyry Cu (North America)
Model Name: Climax Mo

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: White mica and pyrite-oxidation.

Rocks

Name: Gneiss
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Devonian

Name: Gneiss
Role: Associated
Age Type: Associated Rock
Age Young: Late Devonian

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Fluorite
Ore: Galena
Ore: Molybdenite

Comments

Comment (Geology): Age = Devonian, based on the age of the pluton (Nelson and Grybeck, 1980).

Comment (Reference): Primary Reference = Grybeck and Nelson, 1981

Comment (Geology): Geologic Description = Porphyritic, foliated granite of Devonian age is irregularly stained a gaudy orange-yellow over an area of about 9 square miles. The staining is related to alteration of the mafic minerals in the granite to coarse white mica and oxidization of pervasive disseminated pyrite. Grab samples rarely give anomalous metal values but extended search almost anywhere can usually locate a few grains of molybdenite, fluorite, or arsenopyrite along fractures in the altered granite. ? At one outcrop near the top of peak 6711 in the center of the area, a one-inch-thick quartz vein in a small roof pendant of calc-silicate rocks that overlie the granite contains visible galena and 7 ppm Ag. Area only brielfy examined at a few scattered places and it is likely that other such occurrences can be found in this roof pendant.

Comment (Deposit): Model Name = Porphyry Mo or porphyry Cu (Cox and Singer, 1986; models 16 or 17)

Comment (Deposit): Other Comments = Located within Gates of the Arctic National Park.

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Nelson, S.W., and Grybeck, D.J., 1980, Geologic map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-A, 2 sheets, scale 1:250,000.

Reference (Deposit): Grybeck, D.J., and Nelson, S.W., 1981, Mineral deposit map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-F, 1 sheet, scale 1:250,000.

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