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Fortyseven Creek Placer

Producer in Alaska, United States with commodities Gold, Tungsten
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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 10002507
MRDS ID A013447
Record type Site
Current site name Fortyseven Creek Placer
Alternate or previous names Fortyseven Creek, placer
Related records 10282683

Geographic coordinates

Geographic coordinates: -158.15891, 61.04742 (WGS84)
Relative position The Fortyseven Creek placer includeds the portion of Fortyseven Creek that transects section 16 in T 11 N, R 50 W in the Sleetmute A6 quadrangle. The location given is at mine symbol on Sleetmute A-6 topographic map; accurate within 0.25 mile (0.4 km).

Site location context

Political divisions (FIPS codes)

Bethel(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sleetmute A-6(quadrangle 1:63,360 scale)

Sleetmute SW(quadrangle 1:100,000 scale)

Sleetmute(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Holitna River(hydrologic unit)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Tungsten Critical Primary

Materials information

Materials Type of material
Gold Ore
Scheelite 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 Host
    Rock type Unconsolidated Deposit > Clay, Mud
  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel

Nearby scientific data

(1) -158.15891, 61.04742
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Placer gold and scheelite recovered in gulch just below lode source (see Fortyseven Creek, lode), at head of Fortyseven Creek. Additional gold recovered downstream, southwest of the Denali-Farewell Fault at the foot of the mountain front. Significant placer concentrations do not occur in stream gravel between the gulch and the fault. Russell Schaefer reported to Cady and others (1955) that southwest of the fault there were two types of placers: 1) minor gold scattered in gravel on bedrock, 2) gold and scheelite concentrated on a "yellow clay hardpan."
  • Age = Tertiary/Quaternary

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic

Comments on exploration

  • Status = Active

Mining district

District name Aniak

Comments on the production information

  • Production Notes = About 2,500 oz of Au produced. Minor amounts of Au and W sold prior to 1950, but main production was between 1981-86.

Comments on the workings information

  • Workings / Exploration = Ore sluiced from cut 400 ft (122 m) long, 30 ft (9 m) wide, and 5 ft (1.5 m) deep in 1950's. More recent workings included prospect pits, stripping, and road building.

Reference information

Bibliographic references

  • Deposit

    Cady, W.M., Wallace, R.E., Hoare, J.M., and Webber, E.J., 1955, The central Kuskokwim region, Alaska: U.S. Geological Survey Professional Paper 268, 132 p.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Sleetmute quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-368, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Dillingham, Sleetmute, and Taylor Mountain quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-606, 92 p.

  • Deposit

    Bundtzen, T.K., and Henning, M.W., 1978, Barite in Alaska: Mines and Geology Bulletin, v. 27, no. 4, p. 1-4.

  • Deposit

    Yeend, W.E., 1986, Descriptive model of Placer Au-PGE, in Cox, D.P., and Singer, D.A., eds. Mineral Deposit Models: U.S. Geological Survey Bulletin 1693, p. 261-4.

  • Deposit

    Miller, M.L., Belkin, H.E., Blodgett, R.B., Bundtzen, T.K., Cady, J.W., Goldfarb, R.J., Gray, J.E., McGimsey, R.G., and Simpson, S.L., 1989, Pre-field study and mineral resource assessment of the Sleetmute quadrangle, southwestern Alaska: U.S. Geological Survey Open-File Report 89-363, 115 p., 3 plates, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Dillingham, Sleetmute, and Taylor Mountains quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-606, 92 p.

Comments on the references

  • Primary Reference = Cady and others, 1955, p. 119-121

General comments

Subject category Comment text
Deposit Model Name = Placer; modern stream, bench
Deposit Other Comments = Stream gradient is 250 ft/mi (47 m/km) upstream from fault, 100 ft/mi (19 m/km) downstream from fault. Denali-Farewell Fault crosses stream at foot of mountain front.

Reporter information

Type Date Name Affiliation Comment
Reporter 02-JUN-1994 Huber, D.F. U.S. Geological Survey
Reporter 02-JUN-1994 Niles, L.P. U.S. Geological Survey
Reporter 02-JUN-1994 Miller, M.L. 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

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