Idaho Bar

Site Name

Primary: Idaho Bar

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Commodity

Primary: Gold

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Location

State: Alaska
District: Rampart

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

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

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Physiography

Not available

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Mineral Deposit Model

Model Name: Placer Au-PGE

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Orebody

Not available

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Structure

Not available

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Alterations

Not available

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Rocks

Name: Greenstone
Role: Associated
Age Type: Associated Rock
Age Young: Late Triassic

Name: Greenstone
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Triassic

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Analytical Data

Not available

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Materials

Ore: Gold

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Comments

Comment (Deposit): Other Comments = Similar deposits that lie on the top of the ridges southeast of Little Minook and Hoosier Creeks, in the Tanana quadrangle, are known as California and Florida Bars.

Comment (Exploration): Status = Inactive

Comment (Deposit): Model Name = Placer gold deposit (Cox and Singer, 1986; model 39a).

Comment (Geology): Geologic Description = Coarse and shotty gold occurs in high Pliocene (?) gravels about 1,000 feet higher than the mouth of Little Minook Creek (Mertie, 1934). A shaft at the crest of the ridge is said to have been sunk 100 feet to bedrock (Mertie, 1934). Coarse gravels contain quartzite, quartzite breccia, vein quartz and chert (Prindle and Hess, 1905). Heavy minerals include ilmenite, hematite, and magnetite (Mertie, 1934). Although there was not enough water for large-scale mining, prospecting and drift mining occurred in 1913, the late 1920's and the 1930's (Cobb, 1976; OFR 76-633, p. 102). Some work was reported as late as 1975 (Eberlein and others, 1977, p. 66), and trench work was reported in 1985 (J. Munsell, oral commun., 1999).

Comment (Reference): Primary Reference = Cobb, 1976

Comment (Production): Production Notes = Although there was not enough water for large-scale mining, prospecting and drift mining occurred in 1913, the late 1920's and the 1930's, and some work was reported as late as 1975 (Cobb, 1976; OFR 76-633, p. 102; Eberlein and others, 1977, p.66).

Comment (Workings): Workings / Exploration = Although there was not enough water for large-scale mining, prospecting and drift mining occurred in 1913, the late 1920's and the 1930's (Cobb, 1976; OFR 76-633, p. 102). Some work was reported as late as 1975 (Eberlein and others, 1977, p. 66) and trench work was reported in 1985 (J. Munsell, oral comm., 1999).

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References

Reference (Deposit): Smith, P.S., 1930, Mineral industry of Alaska in 1928: U.S. Geological Survey Bulletin 813-A, p. 1-72.

Reference (Deposit): Smith, P.S., 1933, Mineral industry of Alaska in 1930: U.S. Geological Survey Bulletin 836-A, p. 1-83.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Livengood quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-413, 2 sheets, scale 1:250,000.

Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Livengood quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-819, 241 p.

Reference (Deposit): Chapin, Theodore, 1914, Lode mining near Fairbanks, Alaska: U.S. Geological Survey Bulletin 592-J, p. 321-355.

Reference (Deposit): Smith, P.S., 1934, Mineral industry of Alaska in 1933: U.S. Geological Survey Bulletin 864-A, p. 1-94.

Reference (Deposit): Waters, A.E., 1934, Placer concentrates of the Rampart and Hot Springs district: U.S. Geological Survey Bulletin 844-D, p. 227-246.

Reference (Deposit): Smith, P.S., 1936, Mineral industry in Alaska in 1934: U.S. Geological Survey Bulletin 868-A, p. 1-91.

Reference (Deposit): Smith, P.S., 1934, Mineral industry of Alaska in 1932: U.S. Geological Survey Bulletin 857-A, p. 1-91.

Reference (Deposit): Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 map, scale 1:1,000,000.

Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-633, 72 p.

Reference (Deposit): Smith, P.S., 1937, Mineral industry in Alaska in 1935: U.S. Geological Survey Bulletin 880-A, p. 1-95.

Reference (Deposit): Cobb, E.H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p.

Reference (Deposit): Mertie, J.B., Jr., 1934, Mineral deposits of the Rampart and Hot Springs districts, Alaska: U.S. Geological Survey Bulletin 844-D, p. 163-226.

Reference (Deposit): Smith, P.S., 1933, Mineral industry of Alaska in 1931: U.S. Geological Survey Bulletin 844-A, p. 1-81.

Reference (Deposit): Prindle, L.M. and Hess, F.L., 1905, Rampart placer region: U.S. Geological Survey Bulletin 259, p. 104-119.

Reference (Deposit): Smith, P.S., 1933, Mineral industry of Alaska in 1930: U.S. Geological Survey Bulletin 836, p. 1-83.

Reference (Deposit): Smith, P.S., 1930, Mineral industry of Alaska in 1928: U.S. Geological Survey Bulletin 813, p. 1-72.

Reference (Deposit): Prindle, L.M. and Hess, F.L., 1906, The Rampart gold placer region, Alaska: U.S. Geological Survey Bulletin 280, 54 p.

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