Logan Beach

Past Producer in Alaska, United States with commodities Gold, Iron, Molybdenum

Geologic information

Identification information

Deposit ID 10002467
MRDS ID A013398
Record type Site
Current site name Logan Beach
Related records 10137084

Geographic coordinates

Geographic coordinates: -139.5942, 59.81969 (WGS84)
Relative position Logan Beach is within Yakutat Bay, immediately south of Logan Bluffs; it extends about 2 miles north and 3 miles south of cited coordinate location which is in section 21, T. 24 S., R. 34 E., of the Copper River Meridian. The locality is number 3 of Cobb (1972).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Iron Secondary
Molybdenum Secondary

Comments on the commodity information

  • Ore Material = Gold (native)

Materials information

Materials Type of material
Gold Ore
Garnet Gangue
Magnetite Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
    Stratigraphic age (youngest) Holocene
  • Host or associated Host
    Rock type Unconsolidated Deposit > Sand and Gravel
  • Host or associated Host
    Rock type Unconsolidated Deposit > Glacial Sediment

Nearby scientific data

(1) -139.5942, 59.81969

Comments on the geologic information

  • Geologic Description = Logan beach is a wave-cut beach formed from gravelly terrace deposits of glacial material which form the bluffs behind the beach. The bedrock on the upland hills to the east of the deposit consists of graywacke and argillite of the Yakutat Group of Jurassic and Cretaceous age (MacKevett and Plafker, 1970). At the beach, gold occurred in thin transient deposits enriched in garnet or magnetite; the beach placer was derived by winnowing wave-action on weakly auriferous glacial gravels.? the placer could also contain reworked materials brought down from the Jura-Cretaceous bedrock. MacKevett and Plafker (1970, pl. 1) report anomalous amounts of molybdenum (3 to 10 ppm) in two stream sediment samples from the Logan Beach. Molybdenum is commonly enriched in organic shales as well as granitic rocks, but its source in the bedrock behind the Logan Beach is unknown.? Reimnitz and Plafker (1976, pl. I) reported 0.010 ppm gold in one sample from the beach.
  • Age = Holocene

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Yakutat

Comments on the production information

  • Production Notes = The beach had a very limited production--a maximum of a few hundred ounces of gold.

Comments on the workings information

  • Workings / Exploration = Surface workings, rockers and sluices. The occurrence is one of the first placers discovered in the Yakutat quadrangle (Tarr, 1906; Tarr and Butler, 1909).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013398
USGS Alaska Resource Data File ARDF YA004

Bibliographic references

  • Deposit

    Tarr, R.S., 1906, The Yakutat Bay region: U.S. Geological Survey Bulletin 284, p. 61-64.

  • Deposit

    Tarr, R.S., and Butler, B.S., 1909, Area geology, in Tarr, R. S. and Butler, B. S, The Yakutat Bay region, Alaska: U.S. Geological Survey Professional Paper 64, p. 145-178.

  • Deposit

    Brooks, A.H., 1918, Mineral resources of Alaska, 1916: U.S. Geological Survey Bulletin 662, 469 p.

  • Deposit

    Thomas, B.I., and Berryhill, R. V., 1962, Reconnaissance studies of Alaskan beach sands, eastern Gulf of Alaska: U.S. Bureau of Mines Report of Investigations 5986, 40 p.

  • Deposit

    MacKevett, E.M., Jr., and Plafker, G., 1970, Geochemical and geophysical reconnaissance of parts of the Yakutat and Mount St. Elias quadrangles, Alaska: U.S. Geological Survey Bulletin 1312-L, 12 p.

  • Deposit

    Reimnitz, Erk, and Plafker, George, 1976, Marine gold placers along the Gulf of Alaska margin: U.S. Geological Survey Bulletin 1415, 16 p.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Yakutat quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-408, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Tarr and Butler, 1909.

General comments

Subject category Comment text
Deposit Model Name = Beach placer
Deposit Other Comments = the Logan beach placer is within the Russell Fiord Wilderness area of Tongass National Forest.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-APR-99 Hawley, C.C. Hawley Resource Group