Sevenmile Beach

The Sevenmile Beach is a gold 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: Sevenmile Beach

Commodity

Primary: Gold

Location

State: Alaska
District: Kodiak

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Placer Au-PGE

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Sand and Gravel
Role: Host
Age Type: Host Rock
Age Young: Holocene

Name: Sand and Gravel
Role: Host
Age Type: Host Rock
Age Young: Holocene

Analytical Data

Not available

Materials

Ore: Gold

Comments

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = The beach deposit was mined by portable sluice boxes and rockers with most of the production taking place in 1911 and 1912.

Comment (Deposit): Model Name = Gold placer (Cox and Singer, 1986; model 39a).

Comment (Geology): Geologic Description = Brooks (1912) first reported that a new beach placer had been found near Uyak in the summer of 1911. This is a broad sand and gravel beach, behind which are 60-foot bluffs of glacial gravel and till. Most of the gold was obtained over a distance of 3 3/4 miles, where the best pay occurred near the base of the bluffs on a clay layer which lay 1 to 6 feet below the surface. The pay streak was 12 to 16 inches thick and contained some nuggets valued up to $0.25 (gold price at $20.67). Sluice boxes and rockers were used in the mining and it was said that a person could recover up to $10 worth of gold per day. By 1912 the paystreak was apparently worked out. The immediate source of the gold is thought to be the glacial material eroded from the bluffs. Brooks (1918) reported that a sample collected here contained no detectable platinum.

Comment (Geology): Age = Quaternary

Comment (Reference): Primary Reference = Martin, 1913

References

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Karluk quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-459, 1 sheet, scale 1:250,000.

Reference (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.

Reference (Deposit): Brooks, A.H., 1912, The mining industry in 1911, in Brooks, A.H., and others, Mineral resources of Alaska, report on progress of investigations in 1911: U.S. Geological Survey Bulletin 520-A, p. 17-44.

Reference (Deposit): Maddren, A.G., 1919, The beach placers of the west coast of Kodiak Island, Alaska, in Martin, G.C., and others, Mineral resources of Alaska, 1917: U.S. Geological Survey Bulletin 692-E, p. 299-319.

Reference (Deposit): Cobb, E.H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p.

Reference (Deposit): Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Afognak, Karluk, Kodiak, and Trinity Islands quadrangles, Alaska: U.S. Geological Survey Open-File Report 79-860, 49 p.

Reference (Deposit): Martin, G.C., 1913, Mineral deposits of Kodiak and neighboring islands, in Brooks, A.H., and others, Mineral resources of Alaska, 1912: U.S. Geological Survey Bulletin 542, p. 125-136.

Reference (Deposit): Capps, S.R., 1937, Kodiak and adjacent islands, Alaska, in Smith, P.S. and others, Mineral resources of Alaska, 1934: U.S. Geological Survey Bulletin 880, p. 111-184, 1 map sheet, scale 1:250,000.

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