Unnamed (near the mouth of Northwestern Lagoon)

Occurrence in Alaska, United States with commodity Gold

Geologic information

Identification information

Deposit ID 10000431
MRDS ID A010598
Record type Site
Current site name Unnamed (near the mouth of Northwestern Lagoon)

Geographic coordinates

Geographic coordinates: -149.89447, 59.74756 (WGS84)
Relative position The occurrence is located on the north shore of Harris Bay in the NW1/4 of section 13, T. 5 S., R. 4 W., of the Seward Meridian. This is location 114 of Tysdal (1978); it is accurate to within a quarter of a mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Pyrite Ore
Feldspar Gangue
Muscovite Gangue
Quartz Gangue

Alteration

  • (Local) None reported.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Valdez Group
    Rock description Valdez Group

Nearby scientific data

(1) -149.89447, 59.74756

Comments on the geologic information

  • Geologic Description = The host rock of the occurrence is a Tertiary iron-stained, muscovite granite dike which cuts hornfelsed slate and graywacke of the Cretaceous Valdez Group. The dike contains disseminated pyrite and (by atomic absorption analysis) 0.15 ppm gold (MacKevett and Holloway, 1977).
  • Age = 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 Homer

Comments on the workings information

  • Workings / Exploration = Hand sample assayed 0.15 ppm Au by atomic absorption (MacKevett and Holloway, 1977).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010598
USGS Alaska Resource Data File ARDF BS010

Bibliographic references

  • Deposit

    Cobb, E.H. and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p.

  • Deposit

    Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

Comments on the references

  • Primary Reference = Cobb and Tysdal, 1980

General comments

Subject category Comment text
Deposit Model Name = Pyrite and gold; Tertiary granite dike.
Deposit Other Comments = the occurrence is in Kenai Fjords National Park; the area is now closed to mineral entry.

Reporter information

Type Date Name Affiliation Comment
Reporter 27-JAN-0099 Jeff A. Huber U.S. Geological Survey