East Takoka Creek

Occurrence in Alaska, United States with commodities Copper, Gold

Geologic information

Identification information

Deposit ID 10002123
MRDS ID A013014
Record type Site
Current site name East Takoka Creek

Geographic coordinates

Geographic coordinates: -154.10265, 60.15943 (WGS84)
Relative position About 2.8 km west of the Kasna Creek prospect near northward flowing Takoka Creek which drains into Kontrashibuna Lake. Locality 30 of Nelson and others (1985). Sec. 23, T. 1 N., R. 28 W., of the Seward Meridian. Locality accurate within 1.2 km.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Gold Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Calcite Gangue
Chlorite Gangue
Epidote Gangue
Quartz Gangue

Alteration

  • (Local) Abundant chlorite, epidote, and sparse quartz-carbonate alteration.

Host and associated rocks

  • Host or associated Host
    Chronological age 59.45
    Uncertainty 3.25
    Stratigraphic age (youngest) Paleocene

Nearby scientific data

(1) -154.10265, 60.15943

Comments on the geologic information

  • Geologic Description = Local zones of fracturing and epidote or quartz-carbonate veins in greenstone contain chalcopyrite and pyrite. Some copper anomalies here may result from high initial copper in basic volcanic rocks (Nelson and others, 1985).? the Tertiary volcanic rocks of this unit includes: rhyolitic breccia, ash-flow tuff, flows, and 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. indicating a Tertiary age for these rocks (Eakins and others, 1978).
  • Age = Probably Tertiary. Volcanic host for mineralization has potassium-argon ages that range from 56.2 to 62.7 m.y. (Eakins and others, 1978).
  • Age = Chron age is for host rock.

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 = Some copper anomalies in the area may result from high background copper in basic volcanic rocks (Nelson and others, 1985). Resource Associates of Alaska (1976) reported one soil sample which yielded 0.8 ppm Au. Area J of Eakins (1970) located approximately 2.6 km downstream contained stream sediment samples which yielded 130 ppm Cu; lead and zinc were not anomalous.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013014
USGS Alaska Resource Data File ARDF LC046

Bibliographic references

  • Deposit

    Resource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: Contract report for U.S. Bureau of Mines, 109 p.

  • 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

    Eakins, G.R., 1970, Geology and geochemistry of Kontrashibuna Lake, Lake Clark region, southwestern Alaska: Alaska Division of Mines and Geology Geochemical Report 20, 34 p.

  • Deposit

    Nelson, W.H., King, H.D., Case, J.E., Tripp, R.B., Crim, W.D., and Cooley, E.F., 1985, Mineral resource map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-B, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Nelson and others, 1985

General comments

Subject category Comment text
Deposit Model Name = Unknown
Deposit Other Comments = Gold anomaly in soil sample is only gold detected in the Kontrashibuna Lake area. Site is in Lake Clark National Park and Preserve.

Reporter information

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