Tak II

Occurrence in Alaska, United States with commodities Copper, Iron

Geologic information

Identification information

Deposit ID 10003599
MRDS ID A106357
Record type Site
Current site name Tak II

Geographic coordinates

Geographic coordinates: -154.15265, 60.12943 (WGS84)
Relative position About 5.6 km south of the western end of Kontrashibuna Lake, near the headwaters of Takoka Creek on peak 4,367. This is locality 10 of MacKevett and Holloway (1977). Sec. 33, T. 1 N., R. 28 W., of the Seward Meridian. Location accurate within 1.6 km.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Iron Primary

Alteration

  • (Local) Unknown

Mineral occurrence model information

Model code 62
USGS model code 18d
Deposit model name Skarn Fe
Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8

Nearby scientific data

(1) -154.15265, 60.12943

Comments on the geologic information

  • Geologic Description = Occurrence identified by 58 lode iron claims (U.S. Bureau of Mines, 1973). MacKevett and Holloway (1977) reported that the occurrence may be in mineralized zones of contact-metamorphosed Upper Triassic limestone and dolomite that has been intruded by Tertiary, medium- to fine-grained hornblende-biotite quartz monzodiorite (Nelson and others, 1983; unit Ti2). The pluton yields concordant potassium-argon ages for hornblende and biotite of about 61 m.y. (Reed and Lanphere, 1972; 1973). Other nearby rocks include Tertiary volcanic rocks, which include rhyolitic breccia, ash-flow tuff, flows, felsic intrusive rocks, and subordinate mafic to intermediate flows (Nelson and others, 1983; unit Tv). Potassium-argon ages for Unit Tv range from 56.2 to 62.7 m.y. (Eakins and others, 1978).
  • Age = Mineralization is Tertiary or younger. The quartz monzodiorite which is probably the source of the skarn yields concordant potassium-argon ages for hornblende and biotite of about 61 m.y. (Reed and Lanphere, 1972; 1973). Potassium-argon ages for the volcanic rocks range from 56.2 to 62.7 m.y. (Eakins and others, 1978).

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bristol Bay

Comments on the production information

  • Production Notes = No production

Comments on the reserve resource information

  • Reserves = No reserves

Comments on the workings information

  • Workings / Exploration = Unknown

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A106357
USGS Alaska Resource Data File ARDF LC049

Bibliographic references

  • Deposit

    Reed, B.L., and Lanphere, M.A., 1972, Generalized geologic map of the Alaska-Aleutian range batholith showing potassium-argon ages of the plutonic rocks: U.S. Geological Survey Miscellaneous Field Studies Map MF-372, 2 sheets, scale 1:1,000,000.

  • Deposit

    Reed, B. L., and Lanphere, M. A., 1973, Alaska-Aleutian Range batholith-- Geochronology, chemistry, and relation to circum-Pacific plutonism: Geological Society of America Bulletin, v. 84, no. 8, p. 2583-2610.

  • Deposit

    U.S. Bureau of Mines, 1973, Alaska 1:250,000-scale quadrangle map overlays showing mineral deposit locations, principal minerals, and number and type of claims: U.S. Bureau of Mines Open-File Report 20-73, 95 overlays (updated in 1986, 1987).

  • Deposit

    Eakins, G.R., Gilbert W.G., and Buntzen, T.K., 1978, Preliminary bedrock geology and mineral resource potential of west-central Lake Clark quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File Report 118, 15 p.

  • Deposit

    Nelson, W.H., Carlson, C., and Case, J.E., 1983, Geologic map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-A, scale 1:250,000.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Comments on the references

  • Primary Reference = U.S. Bureau of Mines, 1973

General comments

Subject category Comment text
Deposit Model Name = Fe skarn ? or Cu skarn ? (Cox and Singer, 1986; model 18d ? or 18b ?)
Deposit Other Comments = Site is in Lake Clark National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-JUN-1998 D.P. Bickerstaff U.S. Geological Survey