The Twentymile River is a gold 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
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Twentymile River MRDS details
Site Name
Primary: Twentymile River
Commodity
Primary: Gold
Location
State: Alaska
District: Anchorage
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
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
Comments
Comment (Reference): Primary Reference = Jansons and others, 1984
Comment (Workings): Workings / Exploration = Five alluvium samples from the upper portions of Twentymile River contained from a trace to 0.0073 oz Au/cubic yard (Jansons and others, 1984).
Comment (Geology): Geologic Description = Placer gold is disseminated in poorly- to moderately-washed glacial fluvial gravels along the upper portions of Twentymile Creek. Five alluvium samples from the upper portions of Twentymile River contained from a trace to 0.0073 oz Au/cubic yard (Jansons and others, 1984). Numerous large boulders are present (Hoekzema and Fechner, 1986). The bedrock in the region is Late Cretaceous metasedimentary rocks of the Valdez Group.
Comment (Deposit): Model Name = Placer Au (Cox and Singer, 1986; model 39a)
Comment (Production): Production Notes = No recorded production, however Hoekzema and Fechner (1986) state the mineral development potential is moderate for small mining operation. Pockets of higher grade material may occur within and adjacent to the river channel (Jansons and others, 1984).
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Quaternary
References
Reference (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.
Reference (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.
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