The Silver Shield is a silver and lead 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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Silver Shield MRDS details
Site Name
Primary: Silver Shield
Commodity
Primary: Silver
Primary: Lead
Secondary: Gold
Secondary: Barium-Barite
Secondary: Copper
Location
State: Alaska
District: Chistochina
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
Model Name: Polymetallic veins
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Name: Tuff
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Permian
Name: Tuff
Role: Associated
Age Type: Host Rock
Age Young: Late Permian
Name: Tuff
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Permian
Name: Tuff
Role: Associated
Age Type: Associated Rock
Age Young: Late Permian
Analytical Data
Not available
Materials
Ore: Galena
Ore: Limonite
Ore: Pyrite
Ore: Tetrahedrite
Ore: Barite
Ore: Cerussite
Gangue: Calcite
Gangue: Quartz
Comments
Comment (Geology): Age = Emplaced subseqent to or is related to the border phase of the Pennsylvanian to Permian, Ahtell pluton.
Comment (Deposit): Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c)
Comment (Workings): Workings / Exploration = The deposit was discovered in 1963 by the Alaska Division of Mines and Minerals and was announced in 1964. It was staked soon afterwards. The deposit has been explored by open cuts.
Comment (Exploration): Status = Inactive
Comment (Reference): Primary Reference = Richter, 1966
Comment (Geology): Geologic Description = The Silver Shield prospect is in a vertical fault zone that separates mixed sedimentary-volcanic rocks to the north and volcanic rocks to the south. The fault strikes N55E. The rocks are mapped as Pennsylvanian to Permian, Tetelna Formation by Richter (1964; 1966).? the vein was discovered by the Alaska Division of Mines and Minerals in 1963 (Richter, 1964) It is poorly exposed but appears to be a limonite-stained quartz vein about five-feet thick with local concentrations of coarse galena, that cuts locally pyritic, sedimentary and volcanic rock. A 3-foot channel sample of the vein contained a trace of gold, 19.8 ounces of silver per ton, and 1.6 percent lead. Another sample contained 21 ounces of silver per ton, and 2.4 percent lead.? Subsequent private exploration determined that the quartz occurs as veins and pods in a 35-foot vertical, fault zone. The quartz veins locally contain segregations of massive barite and lesser amounts of calcite. Galena is disseminated in crystals as much an inch across; cerussite, presumably after galena, also occurs in the veins. Some of the quartz was vuggy and argentiferous tetrahedrite occurs locally in the vuggy zones. Selected samples of tetrahedrite-rich vein material contain as much as 400 ounces of silver per ton (Richter, 1966).
References
Reference (Deposit): Richter, D.H., and Matson, N.A., Jr., 1972, Metallic mineral resources map of the Gulkana quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-419, 1 sheet, scale 1:250,000.
Reference (Deposit): Richter, D.H., 1964, Geology and mineral deposits of the Ahtell Creek area, Slana District, south-central Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 6, 17 p., 1 sheet, scale 1:31,680.
Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Reference (Deposit): Richter, D.H., 1966, Geology of the Slana district on south-central Alaska: Alaska Division of Geological and Geophysical Surveys Geological Report 2l, 36b p., 3 sheets, scale 1:63,360.
Reference (Deposit): Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Gulkana quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1247, 36 p.
Reference (Deposit): Richter, D.H., and Matson, N.A., 1968, Distribution of gold and some base metals in the Slana area, eastern Alaska Range, Alaska: U.S. Geological Survey Circular 593, 20 p.
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