Omilak East

The Omilak East is a zinc, lead, copper, and silver mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Omilak East

Commodity

Primary: Zinc
Primary: Lead
Primary: Copper
Primary: Silver

Location

State: Alaska
District: Council

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic replacement
Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Oxidation; iron oxide-rich gossan float and fragments common in mineralized areas.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Galena
Gangue: Hematite

Comments

Comment (Geology): 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.

Comment (Geology): Age = Cretaceous ; Epigenetic mineralization in metamorphic rocks of Seward Peninsula is primarily of Cretaceous age.

Comment (Reference): Primary Reference = Hedderly-Smith, 1980

Comment (Exploration): Status = Active

Comment (Workings): 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).

Comment (Deposit): Model Number = 19a (?), 22c (?)

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

References

Reference (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.

Reference (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.

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

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