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  3. Alaska Resource Data File (ARDF)

Unnamed (near Styx River)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb; Zn
Ore minerals chalcopyrite; galena; pyrite; pyrrhotite; sphalerite
Gangue minerals quartz; sericite

Geographic location

Quadrangle map, 1:250,000-scale LH
Quadrangle map, 1:63,360-scale C-1
Latitude 61.6606
Longitude -153.0425
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a ridge along the east side of an unnamed east tributary to the Styx River. It is at an elevation of about 5,300 feet, 0.8 mile west of peak 6665. The map site is in the SW1/4 section 11, T 18 N, R 21 W, of the Seward Meridian. This is locality 13 of Cobb (1972 [MF 412]; 1976 [OF 76-485]) and localities 16 and 17 of Gamble and others (1989). The location is probably accurate to within a quarter of a mile.

Geologic setting

Geologic description

Reed and Elliott (1970) reported that float of mineralized granitic rock contains disseminated pyrite and minor chalcopyrite and that float of altered felsic rock contains pyrrhotite, sphalerite, galena, and pyrite. The float also contains quartz veins. Samples of altered felsic rock contain as much as 150 ppm silver, 2 percent copper, greater than 2 percent lead and 1 percent zinc, and 0.4 ppm gold. Other float samples from the general area contain as much as 1,000 ppm silver and 0.5 ppm gold. The granitic rocks are Tertiary plutons of the Alaska-Aleutian Range batholith (Cobb and Reed, 1981).
Geologic map unit (-153.044705523745, 61.6599888674615)
Mineral deposit model Polymetallic veins and porphyry Cu? (Cox and Singer, 1986, model 22c and 17)
Mineral deposit model number 22c, 17?
Age of mineralization Tertiary. Quartz veins and mineralization crosscut float boulders of Tertiary intrusive rocks.
Alteration of deposit Quartz veining and possibly quartz-pyrite-sericite replacement.

Production and reserves

Workings or exploration Reconnaissance sampling has been completed in this area (Reed and Elliott, 1970).
Indication of production None

References

MRDS Number A013070

References

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.
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.
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.
Gamble, B.M., Bailey, E.A., and Reed, B.L., 1989, Gold occurrences near Snowcap Mountain, Lime Hills B-2 quadrangle, Alaska: U.S. Geological Survey Open-File Report 89-0646, 8 p.
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 70-271, 24 p., 4 sheets, scale 1:250,000.
Reporters Travis L. Hudson and Madelyn A. Millholland
Last report date 6/10/2001