Bonanza Creek (Beef claims)

Prospect in Alaska, United States with commodities Molybdenum, Tungsten, Copper

Geologic information

Identification information

Deposit ID 10307304
Record type Site
Current site name Bonanza Creek (Beef claims)

Geographic coordinates

Geographic coordinates: -149.95322, 66.62967 (WGS84)
Relative position The reference point is located in the center of the Beef claim block, located about 12 miles northwest of Dall Mountain (sec. 21, T. 21 N., R. 11 W., of the Fairbanks Meridian); additional scattered mineral occurrences associated with this prospect are reported along a east-northeast trend through sections 20 through 23, T. 21 N., R. 11 W., of the Fairbanks Meridian, and a few somewhat more isolated occurrences in sections 27, 29, 30, and 32, T. 21 N., R. 11 W., of the Fairbanks Meridian. Location is accurate within 1/4-mile radius.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Molybdenum Primary
Tungsten Primary
Copper Secondary

Comments on the commodity information

  • Gangue = Calc-silicate minerals

Materials information

Materials Type of material
Chalcopyrite Ore
Molybdenite Ore
Pyrrhotite Ore
Scheelite Ore
Quartz Gangue


  • (Local) Calc-silicate skarn.

Mineral occurrence model information

Model code 42
USGS model code 14a
Deposit model name W skarn

Host and associated rocks

  • Host or associated Associated
    Rock unit name Kanuti
    Chronological age 90.6
    Dating method K-Ar
    Type of media Granite
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -149.95322, 66.62967

Comments on the geologic information

  • Geologic Description = Scheelite and molybdenite are reported to occur in modest amounts along the margin of the Kanuti batholith in the Bonanza Creek area (Clautice, 1983). The area studied includes a 30-square-mile project area which extends across the Beaver/Bettles quadrangle boundary. Scheelite is reported to occur most commonly as disseminated grains in a relatively sulfide-free pyroxene-garnet skarn and on fracture surfaces in calc-silicate schist, and less commonly in quartz veins. Molybdenite occurs typically as rosettes and small flakes in quartz veins associated with biotite quartz monzonite and less commonly in similar fashion with aplites, pegmatites, and calc-silicate rocks. Grab samples have returned values as high as 0.89 percent W, 300 grams Ag per ton, and 0.65 percent Cu. The granite pluton portion of the Kanuti batholith gave a K-Ar age of 90.6 Ma.
  • Age = Associated granite pluton is part of the Kanuti batholith, which has a K-Ar age date of 90.6 Ma (Nokleberg and others, 1987).
  • Age = Chronological age is for the associated granite pluton.

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Yukon Flats and Koyukuk

Comments on the workings information

  • Workings / Exploration = Some limited trenching in the area, but most of the exploration work has been just west of the Beaver quadrangle boundary.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF BV003

Bibliographic references

  • Deposit

    Clautice, K.H., 1978, Mineral deposits of the Kanuti River area: a summary report: U.S. Bureau of Mines Open-File Report 66-78, 15 p.

  • Deposit

    Clautice, K.H., 1983, Geological sampling and magnetic surveys of a tungsten occurrence, Bonanza Creek area, Hodzana highlands, Alaska: U.S. Bureau of Mines Open-File Report 80-83, 80 p., 4 sheets.

  • Deposit

    Clautice, K.H., 1987, Methods for finding and evaluating tungsten skarns, a case history of Bonanza Creek, Alaska: University of Alaska, Fairbanks, M.Sc. thesis, 120 p., 1 map, scale 1:20,275.

  • 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

    Nokleberg, W.J., Bundtzen, T.K., Grybeck, D.J., Koch, R.D., Eremin, R.A., Rozenblum, I. S., Sidorov, A.A., Byalobzhesky, S.G., Sosunov, G.M., Shpikerman, V.I., Gorodinsky, M.E., 1993, Metallogenesis of mainland Alaska and the Russian Northeast: U.S. Geological Survey Open-File Report 93-0339, 3 sheets, 230 p.

  • Deposit

    Swainbank, R.C., Clautice, K.C., and Nauman, J.L., 1998, Alaska's Mineral Industry 1997: Alaska Division of Geological and Geophysical Surveys Special Report 52, 65 p.

Comments on the references

  • Primary Reference = Clautice, 1983

General comments

Subject category Comment text
Deposit Model Name = W skarn deposit (Cox and Singer, 1986; model 14a)

Reporter information

Type Date Name Affiliation Comment
Reporter 17-NOV-99 J. M. Britton U.S. Geological Survey