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Unnamed

Occurrence in Alaska, United States with commodities Silver, Molybdenum, Lead, Zinc
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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. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10001189
MRDS ID A011898
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -156.28349, 67.41956 (WGS84)
Relative position Located on ridge southeast of Shishakshinovik Pass in T. 23 N., R. 12 E., Kateel River Meridian. Shown as location 52 in Mayfield and Grybeck (1978). Accurate to within 2000 ft. (600 m).?????

Site location context

Political divisions (FIPS codes)

Northwest Arctic(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ambler River B-1(quadrangle 1:63,360 scale)

Ambler River SE(quadrangle 1:100,000 scale)

Ambler River(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)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Molybdenum Primary
Lead Primary
Zinc Critical Primary

Materials information

Materials Type of material
Galena Ore
Molybdenite Ore
Sphalerite Ore

Mineral occurrence model information

Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Shishakshinovik Pluton
    Rock description Shishakshinovik Pluton
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -156.28349, 67.41956
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Minor amounts ofgalena, sphalerite and molybdenite in granite near contact. Deposit is 1. 5 mi. (2.4 km) long and up to 20 ft. (6 m) thick. Granite intrudes sequence of limestone, dolomite, shale, graphite schist, and quartz-chlorite schist; it probably is an apophysis of the Shishakshinovik pluton ( Mayfield and Grybeck, 1978).

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Shungnak

Comments on the workings information

  • Workings / Exploration = Surface workings and high geochem anomalies in Pb, Zn and Mo Mayfield and Grybeck (1978). One float boulder found in drainage contained 5% galena, 10%-15% pyrite, and 3% sphalerite. Degenhart, (1978, p. 391) reported several analyses of samples: sample BM 1230 contained 630 ppm Pb and 400 ppm Zn; a 900 ft (305 m) chip sample of granite (BM 1226) contained 2% Pb, 1.65% Zn, and 3 oz./ton (102 g/ton) Ag. Other mineralized float samples observed in the area. ??

Reference information

Bibliographic references

  • Deposit

    Degenhart, C.E., Griffis, R.J., McQuat, J.F., and Bigelow, C.G., 1978, Mineral studies of the western Brooks Range performed under contract to the U.S. Bureau of Mines, Contract #JO155089: U.S. Bureau of Mines Open-File Report 103-78, 529 p., 11 sheets.

  • Deposit

    Mayfield, C.F. and Grybeck, D., 1978, Mineral occurrences and resource map of the Ambler river quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-120I, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Mayfield and Grybeck, 1978

General comments

Subject category Comment text
Deposit Model Name = Skarn

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUN-1992 K.R. Leonard U.S. Geological Survey
Reporter 30-JUN-1992 R.L. Elliott U.S. Geological Survey
Reporter 30-JUN-1992 J.M. Schmidt 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.