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Unnamed (near Styx River)

Occurrence in Alaska, United States with commodities Silver, Gold, Copper, Lead, Zinc
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Geologic information

Identification information

Deposit ID 10002173
MRDS ID A013070
Record type Site
Current site name Unnamed (near Styx River)

Geographic coordinates

Geographic coordinates: -153.04526, 61.66004 (WGS84)
Relative position 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.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Lead Primary
Zinc Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Pyrrhotite Ore
Sphalerite Ore
Quartz Gangue
Sericite Gangue

Alteration

  • (Local) Quartz veining and possibly quartz-pyrite-sericite replacement.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46
Model code 54
USGS model code 17
Deposit model name Porphyry Cu (North America)
Mark3 model number 81

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Hornblendite

Nearby scientific data

(1) -153.04526, 61.66004
ListMap

Comments on the geologic information

  • 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).
  • Age = Tertiary. Quartz veins and mineralization crosscut float boulders of Tertiary intrusive rocks.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = Reconnaissance sampling has been completed in this area (Reed and Elliott, 1970).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013070
USGS Alaska Resource Data File ARDF LH018

Bibliographic references

  • Deposit

    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.

  • 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).

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Reed and Elliott, 1970

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins and porphyry Cu? (Cox and Singer, 1986, model 22c and 17)
Deposit Model Number = 22c, 17?

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-2001 Travis L. Hudson Applied Geology
Reporter 10-JUN-2001 Travis L. Hudson Applied Geology