The Fortyseven Creek, placer is a gold and tungsten mine located in Alaska.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Fortyseven Creek, placer MRDS details
Site Name
Primary: Fortyseven Creek, placer
Secondary: Fortyseven Creek Placer
Commodity
Primary: Gold
Primary: Tungsten
Location
State: Alaska
District: Aniak
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Placer Au-PGE
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Gold
Ore: Scheelite
Comments
Comment (Geology): Age = Tertiary/Quaternary
Comment (Reference): Primary Reference = Cady and others, 1955, p. 119-121
Comment (Workings): 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.
Comment (Deposit): Model Name = Placer; modern stream, bench
Comment (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.
Comment (Exploration): Status = Active
Comment (Geology): 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."
Comment (Production): 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.
References
Reference (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.
Reference (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.
Reference (Deposit): Bundtzen, T.K., and Henning, M.W., 1978, Barite in Alaska: Mines and Geology Bulletin, v. 27, no. 4, p. 1-4.
Reference (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.
Reference (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.
Reference (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.
Reference (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.
The Top Ten Gold Producing States
These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.
