North Fork (Kougarok River)

Past Producer in Alaska, United States with commodity Gold
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 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).

Site location context

Political divisions (FIPS codes)

Nome(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bendeleben C-6(quadrangle 1:63,360 scale)

Bendeleben NW(quadrangle 1:100,000 scale)

Bendeleben(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Imuruk Basin(hydrologic unit)

Norton Sound(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

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
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

Economic information

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 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

Bibliographic references

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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.