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  3. Mineral Resource Data System (MRDS)

Unnamed (south of Arrigetch Creek)

Occurrence in Alaska, United States with commodities Silver, Copper, Lead, Tin, Zinc, Arsenic, Bismuth, Fluorine-Fluorite, Tungsten
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10001209
MRDS ID A011922
Record type Site
Current site name Unnamed (south of Arrigetch Creek)

Geographic coordinates

Geographic coordinates: -154.02344, 67.42961 (WGS84)
Relative position This site represents several occurrences that cover an area of 4 square miles south of Arrigetch Creek. The coordinates are for the approximate center of the area of occurrences, in sec. 5, T. 23 N., R. 22 E., of the Kateel River Meridian. The location is accurate to within one mile. The site corresponds to localities 33 through 35 of Grybeck and Nelson (1981).

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Survey Pass B-3(quadrangle 1:63,360 scale)

Survey Pass S(quadrangle 1:100,000 scale)

Survey Pass C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

Gates of the Arctic National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Lead Primary
Tin Critical Primary
Zinc Critical Primary
Arsenic Critical Secondary
Bismuth Critical Secondary
Fluorine-Fluorite Critical Secondary
Tungsten Critical Secondary

Comments on the commodity information

  • Gangue = Calc-silicate minerals

Materials information

Materials Type of material
Chalcopyrite Ore
Sphalerite Ore
Magnetite Gangue

Alteration

  • (Local) Calc-silicate minerals.

Mineral occurrence model information

Model code 43
USGS model code 14b
Deposit model name Sn skarn

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Marble
    Rock unit name Skajit Limestone; Dominantly Marble, Some Interlayered Schist
    Rock description Skajit Limestone; Dominantly Marble, Some Interlayered Schist
    Stratigraphic age (youngest) Late Devonian

Nearby scientific data

(1) -154.02344, 67.42961
ListMap

Economic information

Comments on the geologic information

  • 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).
  • Age = Devonian; related to the intrusion of Devonian pluton.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Koyukuk

Comments on the workings information

  • Workings / Exploration = Sites briefly visited during regional geologic mapping by the USGS in the late 1970s.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Grybeck and Nelson, 1981

General comments

Subject category Comment text
Deposit Model Name = Skarn (Cox and Singer, 1986; model 14b)
Deposit Other Comments = Located within Gates of the Arctic National Park.

Reporter information

Type Date Name Affiliation Comment
Reporter 20-SEP-1999 S.W. Nelson U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.