The Unnamed (southwest of Sunshine Valley) is a copper 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 (southwest of Sunshine Valley) MRDS details
Site Name
Primary: Unnamed (southwest of Sunshine Valley)
Commodity
Primary: Copper
Primary: Silver
Location
State: Alaska
District: Bristol Bay Region
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: Silicification and oxidation.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrite
Gangue: Quartz
Comments
Comment (Geology): Geologic Description = The ridge in the area of this occurrence is underlain by two small granitic stocks that sharply crosscut and thermally metamorphose Mesozoic sedimentary country rocks; other plutons may be present in the subsurface of the area (Mertie, 1938; Kilburn and others, 1993). A general area of mineralization and its relation to intrusive rocks on the ridge southwest of Sunshine Valley was originally reported by Mertie (1938, p. 88). This occurrence is in the contact zone of the easternmost of the two exposed plutons. Silicified and oxidized samples of argillite contained anomalous concentrations of Ag, As and Cu (Gray and others, 1992; Kilburn and others, 1993). The contact zone generally is iron-stained and silicified. Weakly mineralized hornfels contains some disseminated pyrite and small quartz-pyrite veinlets. Stream sediment and heavy mineral concentrate in the area contain anomalous concentrations of As, Au, Ba, Bi, Hg, Mo, Pb, Sn, W, and Zn, especially in streams headwatered near the granitic plutons (Cieutat and others, 1988).
Comment (Reference): Primary Reference = Kilburn and others, 1993
Comment (Workings): Workings / Exploration = Surface reconnaissance geochemical sampling has been completed in the area (Kilburn and others, 1993).
Comment (Exploration): Status = Inactive
Comment (Deposit): Other Comments = This occurrence is within Wood-Tikchik State Park.
Comment (Geology): Age = Late Cretaceous or Early Tertiary. Mineralization is probably related to the granitic plutons in the area, which are part of a regionally extensive Upper Cretaceous and Lower Tertiary plutonic suite. K/Ar ages for samples collected from the western stock on this ridge are 69.5 +/-2.1 Ma on biotite and 63.4 +/- 1.9 Ma on hornblende (Hoare and Coonrad, 1978).
Comment (Deposit): Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)
References
Reference (Deposit): Hoare, J.M., and Coonrad, W.L., 1978, Geologic map of the Goodnews and Hagemeister Island quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-B, two sheets, scale 1:250,000.
Reference (Deposit): Kilburn, J.E., Goldfarb, R.J., Griscom, Andrew, and Box, S E., 1993, Map showing metallic mineral resource potential in the Goodnews Bay, Hagemeister Island, and Nushagak Bay quadrangles, southwest Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2228, 4 sheets, scale 1:250,000.
Reference (Deposit): Cieutat, B.A., Goldfarb, R.J., and Specman, W.S., 1988, Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and organic material samples from the Goodnews, Hagemeister Island, and Nushagak quadrangles, southwest Alaska: U.S. Geological Survey Open-File Report 88-591, 187 p.
Reference (Deposit): Mertie, J.B., Jr., 1938, The Nushagak district, Alaska: U.S. Geological Survey Bulletin 903, 96 p.
Reference (Deposit): Gray, J.E., Adrian, B.M., Hagemon, P.L., and Kilburn, J.E., 1992, Analytical results and sample locality map of rock samples from the eastern Goodnews Bay quadrangle, southwest Alaska: U.S. Geological Survey Open-File Report 92-8-A, scale 1:250,000.
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