The Unnamed (near Geyser Creek) is a gold and silver 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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Unnamed (near Geyser Creek) MRDS details
Site Name
Primary: Unnamed (near Geyser Creek)
Commodity
Primary: Gold
Primary: Silver
Secondary: Arsenic
Secondary: Mercury
Location
State: Alaska
District: Aleutian Islands
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: Hot-spring Au-Ag
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: The volcanic rocks exhibit regional propylitic alteration and local intense argillic alteration and weak silicification. The clay zones contain up to 2 percent pyrite and thin, discontinuous quartz veins.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrite
Ore: Gold
Gangue: Quartz
Comments
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Quaternary.
Comment (Reference): Primary Reference = Simpson, 1986
Comment (Workings): Workings / Exploration = Twenty samples collected by Kennecott were found to contain 8 to150 ppm arsenic, 0.005 to 0.58 ppm gold, 0.005 to 1.25 ppm mercury, and 0.2 to 0.6 ppm silver (Simpson, 1986).
Comment (Deposit): Other Comments = This site is on land selected by the Aleut Native Corporation.
Comment (Deposit): Model Name = Hot-spring Au-Ag (Cox and Singer, 1986; model 25a)
Comment (Geology): Geologic Description = Geothermal activity at this site is indicated by a 800 x 2000 foot color anomaly (Simpson, 1986). The rocks here consist of propylitized andesitic flows, tuffs, and volcaniclastics of Pleistocene age. The altered rocks exhibit local zones of intense argillization and weak silicification. The clay zones contain up to 2 percent disseminated pyrite. Nye and others (1992) report dioritic and monzonitic plutons at low elevations on the east and west walls of the lower half of Geyser Creek valley, and they speculate that the plutons may host the geothermal reservoir system. Analyses of 20 rock samples indicated values up to 150 ppm arsenic, 0.58 ppm gold, 1.25 ppm mercury, and 0.2 ppm silver (Simpson, 1985, table 11, pg. 38). In general, the only rocks which contain gold are those which exhibit pyritization and moderate silicification. There does not appear to be any lateral or vertical zonation of the metals.
References
Reference (Deposit): Simpson, D.F., 1986, Aleutian Islands project, 1985 final report: Kennecott-Alaska Exploration Company, 54 p. (Report held by the Aleut Native Corporation, Anchorage, Alaska).
Reference (Deposit): Nye, C.J., Motyka, R.J., Turner, D.L., and Liss, S.A., 1992, Geology and geochemistry of the Geyser Bight geothermal area, Umnak Island, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigation 92-1, 85 p., 2 map sheets, scale 1/24,000.
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