The Sweeper Cove 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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Sweeper Cove MRDS details
Site Name
Primary: Sweeper Cove
Commodity
Primary: Gold
Primary: Silver
Secondary: Lead
Secondary: Copper
Secondary: Zinc
Location
State: Alaska
District: Aleutians
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: Polymetallic veins
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Strong pyritization obscures contact according to Coats (1956), however examination in 1993 did not confirm this.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Galena
Ore: Sphalerite
Gangue: Pyrite
Gangue: Quartz
Comments
Comment (Workings): Workings / Exploration = Assay of pyritic rocks showed negligible gold and silver (Coats, 1956). Sampling of vein in 1993 yielded 300 ppb Au, 15 ppm Ag, 100 ppm Cu, 300 ppm Pb, and 700 ppm Zn (sample 93 TL 106).
Comment (Exploration): Status = Inactive
Comment (Reference): Primary Reference = Coats, 1956
Comment (Deposit): Model Name = Polymetallic vein
Comment (Geology): Geologic Description = Highly pyritized contact between a dioritic intrusion and country rock (Coats,1956). Country rock is mildly altered and metamorphosed volcanic rocks of the Finger Bay Volcanics. Near the contact between the Finger Bay Volcanics and the dioritic intrusion is a quartz vein containing galena and sphalerite(?).
Comment (Geology): Age = Tertiary
References
Reference (Deposit): Coats, R.R., 1956, Geology of northern Adak Island, Alaska: U.S. Geological Survey Bulletin 1028-C, p. 45-67, 1 plate, scale 1:50,000.
Reference (Deposit): unpublished data, U.S. Geological Survey, 1994
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