The Unnamed (on Thomas Bay) 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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Unnamed (on Thomas Bay) MRDS details
Site Name
Primary: Unnamed (on Thomas Bay)
Commodity
Primary: Gold
Secondary: Lead
Secondary: Copper
Secondary: Arsenic
Location
State: Alaska
District: Petersburg
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: Low-sulfide Au-quartz vein
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Unknown or minor.
Rocks
Role: Host
Age Type: Host Rock
Age Old: Late Jurassic
Analytical Data
Not available
Materials
Ore: Pyrrhotite
Ore: Arsenopyrite
Ore: Chalcopyrite
Ore: Galena
Ore: Pyrite
Gangue: Quartz
Comments
Comment (Reference): Primary Reference = Buddington, 1923
Comment (Reserve-Resource): Reserves = None
Comment (Workings): Workings / Exploration = There was some minor development on the prospect prior to 1921 and a claim was active as recently as 1979 (U. S. Bureau of Mines, 1980). Little indication of any surface activity since.
Comment (Deposit): Model Name = Low sulfide gold-quartz vein (Cox and Singer, 1986; model 36a)
Comment (Geology): Age = Younger than the Cretaceous-Tertiary host rock.
Comment (Production): Production Notes = None
Comment (Exploration): Status = Probably inactive
Comment (Geology): Geologic Description = Buddington (1923) indicates that a quartz lode can be traced for about 250 feet; it consists of a sheeted zone at least 12 feet thick that may be as thick as 25-30 feet; about half of the sheeted zone is milky-white quartz and half schist. The quartz veins contain sparse, disseminated pyrite, arsenopyrite, chalcopyrite, pyrrhotite, and galena; specimens of arsenopyrite several inches across are common on the dump. Assays of selected samples show up to 3.85 ppm Au (Grybeck, Karl, and Berg, 1984). ? the country rock in the vicinity is Tertiary-Cretaceous biotite schist associated with the Coast Range metamorphic-plutonic complex to the east (Brew and others, 1984).
Comment (Geology): Age = Host rock is Tertiary - Cretaceous.
References
Reference (Deposit): Brew, D. A., Ovenshine, A. T., Karl, S. M., and Hunt, S. J., 1984, Preliminary reconnaissance geologic map of the Petersburg and parts of the Port Alexander and Sumdum 1:250,000 quadrangles, southeastern Alaska: U.S. Geological Survey Open-File Report 84-405, 43 p., 2 sheets, scale 1:250,000.
Reference (Deposit): U.S. Bureau of Mines, 1980, Claim map, Petersburg quadrangle, Alaska: U.S. Bureau of Mines Map 117, 1 sheet, scale 1:250,000.
Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Petersburg quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-415, 1 sheet, scale 1:250,000.
Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Petersburg quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-870, 53 p.
Reference (Deposit): Buddington, A.F., 1923, Mineral deposits of the Wrangell district; U.S. Geological Survey Bulletin 739, p. 51-75.
Reference (Deposit): Grybeck, D.J., Berg, H.C., and Karl, S.M., 1984, Map and description of the mineral deposits in the Petersburg and eastern Port Alexander quadrangles: U.S. Geological Survey Open-File Report 84-837, 86 p., 1 sheet, scale 1:250,000.
Reference (Deposit): Cobb, E. H., 1972, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Petersburg Quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-870, 53 p.
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