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Jimmy Lake

Occurrence in Alaska, United States with commodities Silver, Copper, Molybdenum, Lead, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10002171
MRDS ID A013068
Record type Site
Current site name Jimmy Lake
Related records 10283044

Geographic coordinates

Geographic coordinates: -153.20055, 61.73337 (WGS84)
Relative position This occurrence is at ane elevation of about 5,000 feet, in the head of a cirque valley, 1.4 miles northeast of Jimmy Lake. The map site is in the southwest 1/4 of section 13, T 19 N, R 22 W, of the Seward Meridian. This is locality 12 of Cobb (1972 [MF 412]; 1976 [OF 76-485]) and locality 11 and 12 of Gamble and others (1989). The location is probably accurate to within 1/4 mile.

Site location context

Political divisions (FIPS codes)

Bethel(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lime Hills C-1(quadrangle 1:63,360 scale)

Lime Hills NE(quadrangle 1:100,000 scale)

Lime Hills(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Molybdenum Primary
Lead Primary
Zinc Critical Primary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Galena Ore
Molybdenite Ore
Sphalerite Ore
Albite Gangue
Fluorite Gangue
Kaolinite Gangue
Quartz Gangue
Sericite Gangue

Alteration

  • (Local) Granite locally replaced by quartz-sericite-kaolinite-albite assemblages.

Mineral occurrence model information

Model code 79
USGS model code 21a
Deposit model name Porphyry Cu-Mo
Mark3 model number 2
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 Plutonic Rock > Granitoid > Granite
    Rock unit name Styx River Batholith
    Rock description Styx River Batholith
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -153.20055, 61.73337
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Reed and Elliott (1970) reported that an altered and mineralized biotite granite stock is present at this locality. Mineralization, mostly identified in float boulders and cobbles, includes (1) altered granite that contains less than 5 percent disseminated galena and sphalerite, (2) altered granite that contains veinlets of quartz, sphalerite, galena, and chalcopyrite, and (3) altered granite that contains a 1-inch-wide quartz-molybdenite vein. The alteration consists of variably developed replacement of granite by quartz, sericite, kaolinite, and albite. Samples contain as much as 15,000 ppm copper, 300 ppm silver, and greater than 20,000 ppm lead, 2,000 ppm molybdenum, and 10,000 ppm zinc. Stream sediment samples from the area contain high contents of silver, arsenic, copper, lead, and zinc. The biotite granite stock contains accessory fluorite and intrudes upper Mesozoic clastic sedimentary rocks and possibly overlying Tertiary volcanic rocks (Cobb and Reed, 1981).
  • Age = Tertiary. Mineralization crosscuts Tertiary granite.

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

Bibliographic references

Comments on the references

  • Primary Reference = Cobb and Reed, 1981

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins? and porphyry Cu-Mo? (Cox and Singer, 1986, models 22c and 21a)
Deposit Model Number = 21a?, 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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.