Unnamed (west of Snowcap Mountain)

Occurrence in Alaska, United States with commodities Silver, Copper, Lead, Antimony, Zinc

Geologic information

Identification information

Deposit ID 10002167
MRDS ID A013064
Record type Site
Current site name Unnamed (west of Snowcap Mountain)

Geographic coordinates

Geographic coordinates: -153.70748, 61.4639 (WGS84)
Relative position This occurrence is on a glacial moraine at the head of a small east tributary to the Stony River. It is at an elevation of about 4,600 feet, 2.6 miles west-northwest of Snowcap Mountain. The map site is in the NE1/4 of section 23, T 16 N., R 25 W, of the Seward Meridian. This is locality 7 of Cobb (1972 [MF 412]; 1976 [OF 76-485]) and Cobb and Reed (1981). The location is probably accurate to within a quarter of a mile.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Silver Primary
Copper Primary
Lead Primary
Antimony Primary
Zinc Primary

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Sphalerite Ore


  • (Local) Sulfidation.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic)
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic)

Nearby scientific data

(1) -153.70748, 61.4639

Comments on the geologic information

  • 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).
  • Age = Late Cretaceous or Tertiary. The volcanic breccia is Upper Cretaceous or Tertiary.

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 surface observation and sampling has been completed at this locality (Reed and Elliott, 1970).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013064
USGS Alaska Resource Data File ARDF LH024

Bibliographic references

  • 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.

  • 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.

  • 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., 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

    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., 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? (Cox and Singer, 1986, model 22c)

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