North Fork (Kougarok River)

Past Producer in Alaska, United States with commodity Gold

Geologic information

Identification information

Deposit ID 10001873
MRDS ID A012694
Record type Site
Current site name North Fork (Kougarok River)

Geographic coordinates

Geographic coordinates: -164.57339, 65.60933 (WGS84)
Relative position North Fork (Kougarok River) is the principal east tributary to Kougarok River. The Nome-Taylor road crosses North Fork about 7.3 miles south of Taylor. The mouth of Harris Creek, the principal north tributary to North Fork, is about 3.7 miles upstream of the Nome-Taylor road crossing of North Fork. Sainsbury and others (1969) show 3,500 feet of placer mine workings on the main channel of North Fork starting 2,000 feet upstream from the mouth of Harris Creek. This is locality 36 of Cobb (1972; MF 417; 1975; OFR 75-429).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore
Hematite Gangue
Magnetite Gangue
Pyrite Gangue

Mineral occurrence model information

Model code 119
USGS model code 39a
BC deposit profile C01. C02
Deposit model name Placer Au-PGE
Mark3 model number 54

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -164.57339, 65.60933

Comments on the geologic information

  • Geologic Description = Gold was discovered on North Fork (Kougarok River) by 1902 (Collier, 1902) and placer mining started by 1903 (Brooks, 1904). Sainsbury and others (1969) show 3,500 feet of placer mine workings on the main channel of North Fork starting 2,000 feet upstream from the mouth of Harris Creek. Gravel benches on North fork are also reported to be gold-bearing (Collier and others, 1908). Early reports (Collier and others, 1908) indicate that coarse, bright, and well-rounded gold was concentrated on limestone (marble) bedrock. Placer concentrates are reported to contain pyrite, hematite, and magnetite (Cobb, 1973, B 1374). The top 3 feet of broken and fractured bedrock was mined. Bedrock in the area is Paleozoic marble that is only locally fossiliferous. Poorly constrained ages for the marble, based on scattered fossil occurrences, are Ordovician to Devonian (Till and others, 1986).
  • Age = Quaternary; this area has probably gone through at least two cycles of erosion and placer development.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Kougarok

Comments on the workings information

  • Workings / Exploration = Surface open-cut placer mine workings extend 3,500 feet along the main channel of North Fork starting 2,000 feet upstream from the mouth of Harris Creek.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012694
USGS Alaska Resource Data File ARDF BN026

Bibliographic references

  • Deposit

    Collier, A.J., 1902, A reconnaissance of the northwestern portion of Seward Peninsula, Alaska: U.S. Geological Survey Professional Paper 2, 70 p.

  • Deposit

    Brooks, A.H., 1904, Placer mining in Alaska in 1903: U.S. Geological Survey Bulletin 225, p. 43-59.

  • Deposit

    Collier, A. J., Hess, F.L., Smith, P.S., and Brooks, A.H., 1908, The gold placers of parts of Seward Peninsula, Alaska, including the Nome, Council, Kougarok, Port Clarence, and Goodhope precincts: U.S. Geological Survey Bulletin 328, 343 p.

  • Deposit

    Sainsbury, C.L., Kachadoorian, Reuban, Hudson, Travis, Smith, T.E., Richards, T.R., and Todd, W.E., 1969, Reconnaissance geologic maps and sample data, Teller A-1, A-2, A-3, B-1, B-2, B-3, C-1, and Bendeleben A-6, B-6, C-6, D-5, and D-6 quadrangles. Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 377, 49 p., 12 sheets, scale 1:63,360.

  • Deposit

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

  • Deposit

    Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bendeleben quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-429, 123 p.

  • Deposit

    Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Bendeleben quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-417, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Cobb, 1975 (OFR 75-429)

General comments

Subject category Comment text
Deposit Model Name = Placer Au-PGE (Cox and Singer, 1986; model 39a)

Reporter information

Type Date Name Affiliation Comment
Reporter 15-MAR-1999 Travis L. Hudson Applied Geology