Unnamed (Bristol Bay coast north of Ugashik Bay)

Occurrence in Alaska, United States with commodities Gold, Iron, Titanium

Geologic information

Identification information

Deposit ID 10001679
MRDS ID A012458
Record type Site
Current site name Unnamed (Bristol Bay coast north of Ugashik Bay)

Geographic coordinates

Geographic coordinates: -157.64255, 57.87932 (WGS84)
Relative position This site represents beach placer deposits which extend from 4 miles north of Cape Greig (Ugashik D-5) northward to 4 1/2 miles south of Goose Point (Naknek A-5), a total of 13 miles (MacKevett and Holloway, 1977, locality 9; Church and others, 1989: MF-1539I, locality 21).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Iron Secondary
Titanium Secondary

Materials information

Materials Type of material
Gold Ore
Ilmenite Ore
Magnetite Ore

Mineral occurrence model information

Model code 119
USGS model code 39a
BC deposit profile C01. C02
Deposit model name Placer Au-PGE
Mark3 model number 54

Host and associated rocks

  • Host or associated Host
    Rock type Unconsolidated Deposit > Sand and Gravel

Nearby scientific data

(1) -157.64255, 57.87932

Comments on the geologic information

  • Geologic Description = This site represents black sand beach placer deposits tested by the U.S. Bureau of Mines in 1969 (Kimball, 1972). The beach consists of silt to large boulder-sized detritus. The coarser material is mostly of igneous origin, and is thought to have been transported from the Aleutian Range. The finer material consists mostly of quartz and feldspar.? Black sand occurs as a veneer, generally forming thin layers or lenses, that covers wide sections of the upper part of the beach. These layers or lenses rarely exceed 6 inches thick, but one layer measured 14 inches. Buried layers were generally of the same thickness. Some of the black sand lenses are up to a 100 feet long, but most are short and narrow, and rarely cover an acre. A magnetic survey failed to detect any large buried bodies of black sand. Magnetite and ilmenite are abundant in the black sands, however hypersthene is the dominant mineral.? the U.S. Bureau of Mines drilled 21 holes along 13 miles of this beach. Hole depths ranged from 2 to 4 feet. They collected 125 samples, 89 of which contained trace to 0.007 ounce of gold per ton.
  • Age = Quaternary.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the workings information

  • Workings / Exploration = The U.S. Bureau of Mines drilled 21 holes in these deposits in 1969 (Kimball, 1972). Of 125 samples, 89 contained trace to 0.007 ounce of gold per ton.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012458
USGS Alaska Resource Data File ARDF UG010

Bibliographic references

  • Deposit

    Kimball, A.L., 1972, Reconnaissance of Ugashik beach sands, Bristol Bay, Alaska: U.S. Bureau of Mines Open-File Report 21-72, 28 p.

  • Deposit

    Cobb, E.H., 1980, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in fifteen quadrangles in southwestern and west-central Alaska: U.S. Geological Survey Open-File Report 80-909, 103 p.

  • Deposit

    Church, S.E., Detterman, R.L., and Wilson, F.H., 1989, Mineral and energy resource assessment maps of the Ugashik, Bristol Bay, and western Karluk quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF 1539-I, 2 map sheets, scale 1:250,000.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Comments on the references

  • Primary Reference = Kimball, 1972

General comments

Subject category Comment text
Deposit Model Name = Placer gold-PGE (Cox and Singer, 1986; model 39a)
Deposit Other Comments = This occurrence is on state land.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-2000 S.H. Pilcher U.S. Geological Survey