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Idaho Bar

Past Producer in Alaska, United States with commodity Gold
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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 10002974
MRDS ID A015471
Record type Site
Current site name Idaho Bar
Related records 10160228

Geographic coordinates

Geographic coordinates: -149.98613, 65.44964 (WGS84)
Relative position Cobb (1972, MF-413), loc. 58; SE1/4NE1/4 sec.10, T. 7 N., R. 12 W., of the Fairbanks Meridian. This deposit is on a high gravel bench between Little Minook, Dawson and Hunter Creeks. Accuracy is within 1,500 feet.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Livengood B-6(quadrangle 1:63,360 scale)

Livengood S(quadrangle 1:100,000 scale)

Livengood(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Mineral occurrence model information

Model code 119
USGS model code 39a
Deposit model name Placer Au-PGE
Mark3 model number 54

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone
    Stratigraphic age (youngest) Late Triassic
    Stratigraphic age (youngest) Late Triassic
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
    Rock unit name Rampart Group
    Rock description Rampart Group

Nearby scientific data

(1) -149.98613, 65.44964
ListMap

Economic information

Comments on the geologic information

  • 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).

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Rampart

Comments on the production information

  • 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).

Comments on the workings information

  • 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).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Cobb, 1976

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 04-MAY-1999 C.J. Freeman Avalon Development Corporation
Reporter 04-MAY-1999 J.R. Guidetti Schaefer Avalon Development Corporation

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.