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Bonanza Creek (Beef claims)

Prospect in Alaska, United States with commodities Molybdenum, Tungsten, Copper
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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. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

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.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Beaver C-6(quadrangle 1:63,360 scale)

Beaver N(quadrangle 1:100,000 scale)

Beaver(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

Yukon Flats National Wildlife Refuge(National Wildlife Refuge)

National Wildlife Refuge FWS(Type of land area)

FWS(Federal land areas administered by FWS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Molybdenum Primary
Tungsten Critical 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

Alteration

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

Nearby scientific data

(1) -149.95322, 66.62967
ListMap

Economic information

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 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

Bibliographic references

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

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.