1. Mineral Resources
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  3. Mineral Resource Data System (MRDS)

Unnamed (near Angiaak Pass)

Occurrence in Alaska, United States with commodities Arsenic, Fluorine-Fluorite, Molybdenum, Silver, Copper, Lead
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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 10001216
MRDS ID A011929
Record type Site
Current site name Unnamed (near Angiaak Pass)

Geographic coordinates

Geographic coordinates: -155.06347, 67.43959 (WGS84)
Relative position This site comprises three occurrences (locations 14, 15, and 16) in Grybeck and Nelson, 1981. The center of the area of occurrences is in sec. 34, T. 24 N., R. 17 E., of the Kateel River Meridian. The area of occurrences covers approximately 9 square miles of the prominent mountain (peak 6711) whose summit is east of Angiaak Pass. Site location is accurate to within 0.5 mi.

Site location context

Political divisions (FIPS codes)

Northwest Arctic(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Survey Pass B-5(quadrangle 1:63,360 scale)

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

Survey Pass(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Kobuk River(hydrologic unit)

Kobuk-Selawik Rivers(hydrologic accounting unit)

Northwest(hydrologic subregion)

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

Materials information

Materials Type of material
Arsenopyrite Ore
Fluorite Ore
Galena Ore
Molybdenite Ore

Alteration

  • (Local) White mica and pyrite-oxidation.

Mineral occurrence model information

Model code 50
USGS model code 16
Deposit model name Climax Mo
Model code 54
USGS model code 17
Deposit model name Porphyry Cu (North America)
Mark3 model number 81

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Mt. Igikpak Pluton
    Rock description Mt. Igikpak Pluton
    Stratigraphic age (youngest) Late Devonian
    Stratigraphic age (youngest) Late Devonian
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -155.06347, 67.43959
ListMap

Economic information

Comments on the geologic information

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

Economic information about the deposit and operations

Development status Occurrence
Commodity type Both

Comments on exploration

  • Status = Inactive

Mining district

District name Noatak

Reference information

Bibliographic references

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Grybeck and Nelson, 1981

General comments

Subject category Comment text
Deposit Model Name = Porphyry Mo or porphyry Cu (Cox and Singer, 1986; models 16 or 17)
Deposit Other Comments = Located within Gates of the Arctic National Park.

Reporter information

Type Date Name Affiliation Comment
Reporter 17-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.