The Unnamed (head of Ohio Creek) is a tin 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 (head of Ohio Creek) MRDS details
Site Name
Primary: Unnamed (head of Ohio Creek)
Commodity
Primary: Tin
Primary: Silver
Secondary: Zinc
Secondary: Tungsten
Secondary: Tantalum
Secondary: Niobium (Columbium)
Secondary: Copper
Secondary: Gold
Location
State: Alaska
District: Valdez Creek
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: Sn greisen
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Greisenization.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Wodginite
Ore: Arsenopyrite
Ore: Cassiterite
Ore: Gold
Gangue: Feldspar
Gangue: Muscovite
Gangue: Quartz
Gangue: Tourmaline
Comments
Comment (Geology): Age = Late Cretaceous or younger.
Comment (Deposit): Model Name = Sn greisen (Cox and Singer, 1986; model 15c)
Comment (Deposit): Other Comments = Stream sediment samples taken from area adjacent to granitic stock suggest undiscovered vein deposits in country rock.
Comment (Geology): Geologic Description = The host rock at this prospect is Upper Cretaceous to Upper Jurassic, intensely deformed and locally highly metamorphosed flysch which is several thousand meters thick (Wilson and others, 1998). The strata have been intruded by a granitic stock 1 mile long by 0.5 mile wide. The deposit consists of tourmaline and muscovite greisen and quartz-arsenopyrite veins. The greisen is up to 10 feet thick. It adjoins a biotite-rich inclusion at least 150 feet long, and locally contains 0.1% Sn (Hawley and others, 1969). The upper 3 to 10 feet of the granitic body contains pegmatitic quartz-arsenopyrite veins that parallel the contact with country rock (Hawley and Clark, 1974). The veins also contain wodginite, a manganese-tin-niobium oxide, and 1.25% tungsten, 147 ounces of silver per ton and traces of tin, lead, and copper (Hawley and others, 1978).
Comment (Workings): Workings / Exploration = There has been minor surface exploration. Veins contain wodginite, a manganese-tin-niobium oxide, and 1.25% tungsten, 147 ounces of silver per ton and traces of tin, lead, and copper (Hawley and others, 1978).
Comment (Reference): Primary Reference = Hawley and others, 1978
Comment (Exploration): Status = Inactive
References
Reference (Deposit): Clark, A.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Healy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-394, 1 sheet, scale 1:250,000.
Reference (Deposit): Hawley, C.C., and Clark, A.L., 1974, Geology and mineral deposits of the upper Chulitna district, Alaska: U.S. Geological Survey Professional Paper 758-B, p. 1-47, 2 sheets, scale 1:12,000 and 1:48,000.
Reference (Deposit): Hawley, C.C., and others, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska. Contract No. JO166107: U.S. Bureau of Mines Open-File Report 24-78, 274 p., 12 sheets.
Reference (Deposit): Ross, C.P., 1933, The Valdez Creek mining district, Alaska: U.S. Geological Survey Bulletin 849, p. 289-467.
Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-1062, 113 p.
Reference (Deposit): Capps, S.R., 1924, Geology and mineral resources of the region traversed by the Alaska Railroad: U.S. Geological Survey Bulletin 755-C, p. 73-150.
Reference (Deposit): Nokleberg, W.J., and others, 1994, Metallogeny and major mineral deposits of Alaska and Metallogenic map of significant metalliferous lode deposits and placer districts of Alaska, in Plafker, G. and Berg, H.C., eds., The Geology of Alaska: Boulder, Colorado, Geological Society of America: The Geology of North America, v. G1, p. 855-904 and v. G1, Plate 11, scale 1:2,500,000.
Reference (Deposit): Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 17 p., 2 sheetsm, scale 1:500,000.
Reference (Deposit): Balen, M.D., 1990, Geochemical sampling results from the Bureau of Mines Investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 plates, scale 1:250,000.
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