The Unnamed (west of Snowcap Mountain) is a zinc, antimony, lead, 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
Elevation:
Commodity: Zinc, Antimony, Lead, Copper, Silver
Lat, Long: 61.46444, -153.70472
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Unnamed (west of Snowcap Mountain) MRDS details
Site Name
Primary: Unnamed (west of Snowcap Mountain)
Commodity
Primary: Zinc
Primary: Antimony
Primary: Lead
Primary: Copper
Primary: Silver
Location
State: Alaska
District: McGrath
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: Sulfidation.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Chalcopyrite
Ore: Galena
Ore: Pyrite
Ore: Sphalerite
Ore: Bornite
Comments
Comment (Reference): Primary Reference = Reed and Elliott, 1970
Comment (Workings): Workings / Exploration = Reconnaissance surface observation and sampling has been completed at this locality (Reed and Elliott, 1970).
Comment (Deposit): Model Name = Polymetallic veins? (Cox and Singer, 1986, model 22c)
Comment (Geology): Age = Late Cretaceous or Tertiary. The volcanic breccia is Upper Cretaceous or Tertiary.
Comment (Exploration): Status = Inactive
Comment (Geology): Geologic Description = Reed and Elliott (1970, p. 23) reported finding a 2-foot-diameter, float boulder of volcanic breccia containing 60 percent sulfide minerals at this locality. The boulder is in glacial float apparently derived from altered Tertiary volcanic rocks in the nearby cirque. A sample of the boulder contained 3,000 ppm silver and 1.5 percent copper, and greater than 2 percent lead, 1 percent antimony, and 1 percent zinc. Country rocks in this area are mostly Jurassic or Lower Cretaceous clastic sedimentary rocks and Upper Cretaceous or Tertiary volcanic rocks (Reed and Lanphere, 1973; Nokleberg and others, 1994).
References
Reference (Deposit): Reed, B.L., and Elliott, R.L., 1970, Reconnaissance geologic map, analyses of bedrock and stream sediment samples, and an aeromagnetic map of parts of the southern Alaska Range: U.S. Geological Survey Open-File Report 70-217, 145 p., 1 sheet, scale 1:250,000. (Also published as U.S. Geological Survey Open-File Report 413).
Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-485, 101 p.
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): Cobb, E.H., 1972, Metallic mineral resources map of the Lime Hills quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-412, 1 sheet, scale 1:250,000.
Reference (Deposit): Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska; Supplement to Open-File Report 76-485; Part A, Summaries to January 1, 1981: U.S. Geological Survey Open-File Report 81-1343-A, 25 p.
Reference (Deposit): Reed, B. L., and Lanphere, M. A., 1973, Alaska-Aleutian Range batholith-- Geochronology, chemistry, and relation to circum-Pacific plutonism: Geological Society of America Bulletin, v. 84, no. 8, p. 2583-2610.
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