The Surprise is a silver and 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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Surprise MRDS details
Site Name
Primary: Surprise
Commodity
Primary: Silver
Primary: Gold
Secondary: Zinc
Secondary: Lead
Secondary: Arsenic
Secondary: Copper
Secondary: Mercury
Location
State: Alaska
District: Alaska Peninsula
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Alteration Text: The host rocks exhibit propylitic and argillic alteration.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Gold
Ore: Pyrite
Gangue: Quartz
Comments
Comment (Geology): Age = Eocene of younger.
Comment (Reference): Primary Reference = Trujillo and others, 1981
Comment (Workings): Workings / Exploration = In 1981, Resource Associates of Alaska explored this prospect by a 255-foot drill hole and several trenches. The best drill intercept was 3.7 feet grading 0.05 ounce of gold and 0.04 ounce of silver per ton (Trujillo and others, 1981).
Comment (Geology): Geologic Description = The Surprise vein is approximately 10 feet in width and is composed of massive and comb quartz containing 0.5 to 3.0 percent pyrite. It strikes northeast and can be followed for 1,000 feet as a magnetic low (Trujillo and others, 1981). This previously unknown vein was penetrated in the upper part of a drill hole positioned to test another vein at depth. Host rocks are propylitized and argillized andesite flows of the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995). The drill hole cut an upper 7.9 feet grading 0.012 ounce of gold and 0.07 ounce of silver per ton. A lower 3.7-foot intercept graded 0.05 ounce of gold and 0.04 ounce of silver per ton. These core intervals also assayed as much as 160 ppm copper, 90 ppm lead, 625 ppm zinc, 100 ppm arsenic, and 0.27 ppm mercury (Trujillo and others, 1981).
Comment (Deposit): Model Name = Epithermal gold vein
Comment (Deposit): Other Comments = This prospect is located on land patented by, or interim-conveyed to, the Aleut Corporation.
Comment (Exploration): Status = Inactive
References
Reference (Deposit): Trujillo, R.S., Anderson, G., MacLeod, T., Hendrick, K., Farnham, S., Peterson, J., 1981. Exploration and evaluation of the Unga-Popof-Korovan Islands portion of lands leased from Aleut Native Corporation: Resource Associates of Alaska report, 70 p., 38 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reference (Deposit): Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 map sheet, scale 1:250,000.
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