1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Northwest Fork of Coghill River

Occurrence 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. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10003437
MRDS ID A106194
Record type Site
Current site name Northwest Fork of Coghill River

Geographic coordinates

Geographic coordinates: -147.74259, 61.13957 (WGS84)
Relative position Northwest fork of the Coghill River (north of Coghill Lake). Accurate within 2 miles. Locality P-38 of Jansons and others (1984) and locality P-32 of Hoekzema and Fechner (1986).

Site location context

Political divisions (FIPS codes)

Valdez-Cordova(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Anchorage A-2(quadrangle 1:63,360 scale)

Anchorage SE(quadrangle 1:100,000 scale)

Anchorage(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Eastern Prince William Sound(hydrologic unit)

Prince William Sound(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Chugach National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

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

Nearby scientific data

(1) -147.74259, 61.13957
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = According to Jansons and others (1984), gold is found in thin, poorly to moderately sorted alluvial gravels and concentrated on and in slate bedrock exposed in the canyon of the northwest fork of Coghill River. A small amount of gravel occurs in the canyon, but a substantial amount has accumulated above its junction with the main fork of the Coghill River. ? Three alluvium samples contained 0.0004 to 0.0063 oz Au/cubic yard. Gold nuggets up to 1/16 in diameter was recovered (Jansons and others, 1984).
  • Age = Quaternary

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Prince William Sound

Comments on the production information

  • Production Notes = There is no recorded production, however Hoekzema and Fechner (1986) report the potential for mineral development to be moderate for suction dredging. The grades are low to marginal, but there is a good possibility of identifying local economic concentrations of gold.

Comments on the workings information

  • Workings / Exploration = Three alluvium samples contained 0.0004 to 0.0063 oz Au/cubic yard. Gold up to 1/16 in diameter was recovered. Considerable arsenopyrite was also recovered (Jansons and others, 1984).

Reference information

Bibliographic references

  • Deposit

    Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, Southcentral Alaska: U.S. Bureau of Mines Open-File Report 5-84, 218 p., 2 sheets, scale 1:250,000.

  • Deposit

    Hoekzema, R.B., and Fechner, S.A., 1986, Placer Gold sampling in and near the Chugach National Forest, Alaska: U.S. Bureau of Mines Information Circular 9091, 42 p.

Comments on the references

  • Primary Reference = Jansons and others, 1984

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUL-1998 D.P. Bickerstaff U.S. Geological Survey
Reporter 30-JUL-1998 S.W. Huss U.S. Geological Survey

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.