Bradley Scheelite

The Bradley Scheelite is a tungsten and gold mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Bradley Scheelite
Secondary: Bird Creek

Commodity

Primary: Tungsten
Primary: Gold

Location

State: Alaska
District: Yentna

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Low-sulfide Au-quartz vein

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Mafic Intrusive Rock
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Gold
Ore: Scheelite

Comments

Comment (Reference): Primary Reference = Clark and Hawley, 1968

Comment (Production): 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).

Comment (Workings): 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.

Comment (Geology): 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.

Comment (Deposit): Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a).

Comment (Deposit): Other Comments = Placer workings downstream in Bird Creek (TL040) are likely derived, at least in part, from this occurrence.

Comment (Geology): Age = Tertiary; mineralization is interpreted to be related to the felsite dikes that are described as Tertiary in age by Clark and Hawley (1968).

References

Reference (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.

Reference (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.

Reference (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.

Reference (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.

Reference (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.

Reference (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.

Reference (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.

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