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Kemuk

Prospect in Alaska, United States with commodities Iron, Titanium, PGE
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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. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10308824
MRDS ID A013219
Record type Site
Current site name Kemuk
Related records 10002311

Geographic coordinates

Geographic coordinates: -157.67268, 59.71935 (WGS84)
Relative position The Kemuk prospect is in the north-central Dillingham C-5 quadrangle 12 miles east-northeast of the summit of Kemuk Mountain. The map site is at the south end of the boundary between sections 19 and 20, T 5 S, R 49 W, of the Seward Meridian. This is an area of extensive surficial deposits with few conspicuous topographic features. Napotoli Creek is 1.9 miles directly north and Klutuk Creek is 8 miles directly south of the prospect. The location is accurate to within 1 mile.

Site location context

Political divisions (FIPS codes)

Dillingham(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Dillingham C-5(quadrangle 1:63,360 scale)

Dillingham NW(quadrangle 1:100,000 scale)

Dillingham C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Nushagak River(hydrologic unit)

Nushagak River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Iron Primary
Titanium Critical Secondary
PGE Critical Secondary

Materials information

Materials Type of material
Titaniferous Magnetitite Ore

Mineral occurrence model information

Model code 23
USGS model code 9
Deposit model name Alaskan Cr-Pt (PGE)
Mark3 model number 120

Nearby scientific data

(1) -157.67268, 59.71935
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Kemuk prospect was first discovered as a result of an aeromagnetic survey flown for Humble Oil and Refining Company in 1959 (Berg and Cobb, 1967, p. 11). The map site is at the approximate center of a 4 square mile aeromagnetic anomaly. Buried below 90 to 140 feet of unconsolidated Quaternary deposits is a large, composite ultramafic and mafic pluton. The pluton is known from the results of 16 diamond drill holes, some drilled to almost 2,000 feet. It is a composite, tabular, southeast-dipping body (Nokleberg and others, 1987) of abundant clinopyroxenite, some olivine-bearing rocks, and some hornblende-bearing rocks (T. Hinderman, personal commun., 2000). Country rocks encountered in some drill holes are hornfels and quartzite. The metalliferous mineral is titaniferous magnetite that probably occurs as segregations and disseminations in clinopyroxenite. This prospect is believed to contain 2.4 billion long tons averaging 15 to 17 percent total Fe (Nokleberg and others, 1987). The average grade is 10.5 to 12 percent magnetic Fe and 15 to 17 percent total Fe. A beneficiation test indicates the feasibility of producing a concentrate containing 65 percent Fe, 2 to 3 percent SiO2, 0.005 to 0.016 percent P2O5, and 2 to 3 percent TiO2. The platinum-group metal (PGM) potential of this prospect is now being evaluated (T. Hinderman, personal commun., 2000).
  • Age = Not known; the age of the country rocks is uncertain. From regional trends, they could be clastic sedimentary rocks of either Jurassic or Cretaceous age (Decker and others, 1994). The quartz-rich character of the country rocks suggests that they could be older than Cretaceous (Mertie, 1938). The composite ultramafic pluton at Red Mountain in the Hagemeister Island quadrangle to the west is Jurassic in age.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bristol Bay region

Comments on the reserve resource information

  • Reserves = This prospect is believed to contain 2.4 billion long tons averaging 15 to 17 percent total Fe (Nokleberg and others, 1987). The average grade is 10.5 to 12 percent magnetic Fe and 15 to 17 percent total Fe. A beneficiation test indicates the feasibility of producing a concentrate containing 65 percent Fe, 2 to 3 percent SiO2, 0.005 to 0.016 percent P2O5, and 2 to 3 percent TiO2.

Comments on the workings information

  • Workings / Exploration = The Kemuk prospect was first discovered as a result of an aeromagnetic survey flown for Humble Oil and Refining Company in 1959 (Berg and Cobb, 1967, p. 11). It was subsequently explored by this company with 16 diamond core drill holes to maximum depth of about 2,000 feet.

Reference information

Bibliographic references

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

  • Deposit

    Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Dillingham, Sleetmute, and Taylor Mountain quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-606, 92 p.

  • Deposit

    Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, D.J., Robinson, M.S., Smith, T.E., and Yeend, W., 1987, Significant metalliferous lode deposits and placer districts of Alaska: U.S. Geological Survey Bulletin 1786, 104 p.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Dillingham quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-375, 1 sheet, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Dillingham, Sleetmute, and Taylor Mountains quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-606, 92 p.

Comments on the references

  • Primary Reference = Nokleberg and others, 1987

General comments

Subject category Comment text
Deposit Model Name = Titaniferous magnetite in clinopyroxenite; Alaska PGE ? (Cox and Singer, 1986; model 9?)

Reporter information

Type Date Name Affiliation Comment
Reporter 15-MAR-2001 Travis L. Hudson Applied Geology

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.