Kemuk

The Kemuk is a iron 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

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Site Name

Primary: Kemuk

Commodity

Primary: Iron
Secondary: PGE
Secondary: Titanium

Location

State: Alaska
District: Bristol Bay region

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Alaskan Cr-Pt (PGE)

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Titaniferous Magnetitite

Comments

Comment (Workings): 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.

Comment (Exploration): Status = Inactive

Comment (Reserve-Resource): 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.

Comment (Reference): Primary Reference = Nokleberg and others, 1987

Comment (Geology): 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.

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

Comment (Geology): 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).

References

Reference (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.

Reference (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.

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

Reference (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.

Reference (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.

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