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Omilak East

Prospect in Alaska, United States with commodities Silver, Copper, 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. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10307299
Record type Site
Current site name Omilak East

Geographic coordinates

Geographic coordinates: -162.56329, 65.04936 (WGS84)
Relative position The Omilak East prospect is located in the headwaters of the South Fork of Mosquito Creek, at an approximate elevation of 1,350 feet. Mosquito Creek flows westward from headwaters in the northern Darby Mountains to Telephone Creek, a tributary to Fish River in McCarthy's Marsh. It is locality 56 of Gamble (1988).

Site location context

Political divisions (FIPS codes)

Nome(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bendeleben A-2(quadrangle 1:63,360 scale)

Bendeleben SE(quadrangle 1:100,000 scale)

Bendeleben(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Nome(hydrologic unit)

Norton Sound(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Lead Primary
Zinc Critical Primary

Materials information

Materials Type of material
Galena Ore
Hematite Gangue

Alteration

  • (Local) Oxidation; iron oxide-rich gossan float and fragments common in mineralized areas.

Mineral occurrence model information

Model code 72
USGS model code 19a
Deposit model name Polymetallic replacement
Mark3 model number 47
Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -162.56329, 65.04936
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Galena-bearing gossans and oxidized veins in schist are present here (Gamble, 1988). This is probably similar to the Foster prospect (BN098) although it is apparently not hosted by carbonate rocks. Gossan and veinlets are hosted by a calc-silicate schist and biotite schist unit (Hedderly-Smith, 1980). Geologic mapping, soil sampling, selected rock sampling, and EM surveys have been completed here by Greatland Exploration Ltd. (Hedderly-Smith, 1980). This work was primarily between 1976 and 1980. The reconnaissance soil sample lines have anomalous zinc values over a length of of at least 1,200 feet. Rock samples contain up to 4.4 % Pb, 3.4 % Zn, 0.2 % Cu, and 50 ounces/ton Ag. The EM survey defines a strong and continuous electrically conductive zone that is 11,000 feet long with a depth to top varying from 100 to 300 feet (Clayton, 1998). Surface mineralization is highly oxidized; galena and pyrite form remnant nodules in gossan. The indicated electrical conductivity is moderately high and permafrost, which may be present to a depth of a few hundred feet, may have reduced its intensity.
  • Age = Cretaceous ; Epigenetic mineralization in metamorphic rocks of Seward Peninsula is primarily of Cretaceous age.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Active

Mining district

District name Council

Comments on the workings information

  • Workings / Exploration = Geologic mapping, soil sampling, selected rock sampling, and EM surveys have been completed here by by Greatland Exploration Ltd. (Hedderly-Smith, 1980). This work was primarily between 1976 and 1980. The active claim group here is maintained by Greatland Exploration Ltd. (3512 Campbell Airstrip Road, Anchorage, AK 99504).

Reference information

Bibliographic references

  • Deposit

    Hedderly-Smith, D.A, 1980, Summary report on the Omilak East property, Seward Peninsula, Alaska: Anchorage, Greatland Exploration Ltd., internal report, 48 p.

  • Deposit

    Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000.

  • Deposit

    Clayton, R.H., 1998, The Omilak East Property of Greatland Exploration Ltd; Summary and Update: Anchorage, Alaska, Greatland Exploration Ltd. internal report, 7 p.

Comments on the references

  • Primary Reference = Hedderly-Smith, 1980

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein or replacement (Cox and Singer, 1986; model 19a or 22c ?)
Deposit Model Number = 19a (?), 22c (?)

Reporter information

Type Date Name Affiliation Comment
Reporter 15-MAR-99 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.