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Bradley Scheelite

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

Geologic information

Identification information

Deposit ID 10000899
MRDS ID A011553
Record type Site
Current site name Bradley Scheelite
Alternate or previous names Bird Creek
Related records 10112484

Geographic coordinates

Geographic coordinates: -150.95669, 62.58148 (WGS84)
Relative position C.C. Hawley and Associates, Inc. (1978, Fig. 4.2-B(3)) locate this prospect on a tributary of Bird Creek in the southwest quarter of Section 22, T. 29 N., R. 9 W., of the Seward Meridian.

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Talkeetna C-2(quadrangle 1:63,360 scale)

Talkeetna NE(quadrangle 1:100,000 scale)

Talkeetna(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Yentna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Tungsten Critical Primary

Materials information

Materials Type of material
Arsenopyrite Ore
Gold Ore
Scheelite Ore

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock

Nearby scientific data

(1) -150.95669, 62.58148
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = At this locality northeast-striking felsite dikes of Tertiary age cut a sequence of Mesozoic graywacke and argillite (KJs) (C.C. Hawley and Associates, Inc., 1978; Reed and Nelson, 1980). Thin (one-half inch to three inches wide) ladder-type arsenopyrite-scheelite-quartz veins that contain free gold run parallel to the dikes (Reed and others, 1978). Clark and Hawley (1968, p. 41, samples 208 and 210) report 103 ppm gold in a 3-inch-wide arsenopyrite vein; 28.0 ppm gold and 100 ppm tungsten in a 1-inch-wide quartz-arsenopyrite vein.? Placer workings downstream in Bird Creek (TL040) are likely derived, at least in part, from this occurrence.
  • Age = Tertiary; mineralization is interpreted to be related to the felsite dikes that are described as Tertiary in age by Clark and Hawley (1968).

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Mining district

District name Yentna

Comments on the production information

  • Production Notes = 600 to 800 pounds of scheelite-bearing float were removed from the site by the late Shorty Bradley (C.C. Hawley and Associates, Inc., 1978).

Comments on the workings information

  • Workings / Exploration = Reconnaissance mapping, stream silt and rock sampling by the U.S. Geological Survey (Clark and Hawley,1968; Reed and Nelson, 1980) and by C.C. Hawley and Associates, Inc. (1978) have been completed in this area. They report that 600 to 800 lb. of scheelite-bearing float was removed from the site by the late Shorty Bradley.

Reference information

Bibliographic references

  • Deposit

    Clark, A.L., and Hawley, C.C., 1968, Reconnaissance geology, mineral occurrences, and geochemical anomalies of the Yentna district, Alaska: U.S. Geological Survey Open-File Report 68-35, 64 p.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    C.C. Hawley and Associates, Inc., 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U.S. Bureau of Mines Open-File Report 24-78, 275 p., 7 plates.

  • Deposit

    Reed, B.L., Nelson, S.W., Curtin, G.C., and Singer, D.A., 1978, Mineral resources map of the Talkeetna Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-870-D, 1 sheet, scale 1:250,000.

  • Deposit

    Cobb, E.H., and Reed, B.L., 1980, Summaries of data and lists of reference to metallic and selected nonmetallic mineral deposits in the Talkeetna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-884, 106 p.

  • Deposit

    Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, scale 1:250,000.

  • Deposit

    Clark, A.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-369, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Clark and Hawley, 1968

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a).
Deposit Other Comments = Placer workings downstream in Bird Creek (TL040) are likely derived, at least in part, from this occurrence.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-AUG-1998 Madelyn A. Millholland Millholland & Associates

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.