Unnamed (south of Arrigetch Creek)

The Unnamed (south of Arrigetch Creek) is a lead, tin, copper, silver, 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

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 (south of Arrigetch Creek)

Commodity

Primary: Lead
Primary: Tin
Primary: Copper
Primary: Silver
Primary: Zinc
Secondary: Tungsten
Secondary: Fluorine-Fluorite
Secondary: Bismuth
Secondary: Arsenic

Location

State: Alaska
District: Koyukuk

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: Sn skarn

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Calc-silicate minerals.

Rocks

Name: Marble
Role: Host
Age Type: Host Rock Unit
Age Young: Late Devonian

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Sphalerite
Gangue: Magnetite

Comments

Comment (Commodity): Gangue = Calc-silicate minerals

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

Comment (Deposit): Model Name = Skarn (Cox and Singer, 1986; model 14b)

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

Comment (Workings): Workings / Exploration = Sites briefly visited during regional geologic mapping by the USGS in the late 1970s.

Comment (Geology): Age = Devonian; related to the intrusion of Devonian pluton.

Comment (Exploration): Status = Inactive

Comment (Geology): Geologic Description = This site consists of three contact-metamorphic (skarn) deposits adjacent to Devonian granite (Grybeck and Nelson, 1981). At one locality several tactite bodies up to 700 m long by 70 m thick at a granite-carbonate contact contain lenses and pods of magnetite, and minor disseminated chalcopyrite, sphalerite and unspecified tungsten minerals. At another locality, heterogeneous contact-metamorphic rocks include fluorite-magnetite rock, quartz-epidote skarn, epidote-garnet skarn and sphalerite-epidote skarn. Selected samples contain up to 150 ppm Ag, 1000 pm Bi, and more than 1 percent each of Sn, Pb, and Zn. A brief reconnaissance of a granite-phyllite contact revealed several tactite pods less than 5 m wide. The most prominent consists of magnetite with copper staining. Grab samples contain up to 1000 ppm each of As, Cu, Sn, and Zn. These occurrences probably are similar in origin to other Devonian contact-metamorphic deposits in nearby areas of the Brooks Range (Newberry and others, 1986).

References

Reference (Deposit): Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752

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.

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.