Occurrence in Alaska, United States with commodities Silver, Gold

Geologic information

Identification information

Deposit ID 10000171
MRDS ID A010207
Record type Site
Current site name Boundary
Related records 10185411

Geographic coordinates

Geographic coordinates: -130.78179, 56.32977 (WGS84)
Relative position The Boundary occurrence, known in 1981 (Elliott and Koch, 1981, p. 8, loc. 14) only from a U.S. Bureau of Mines claims map (U.S. Bureau of Mines, 1979), probably is a placer deposit on the Unuk River approximately 1.5 mile below the Alaska-British Columbia boundary. The location is probably accurate within about a quarter of a mile.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Silver Primary
Gold Primary

Nearby scientific data

(1) -130.78179, 56.32977

Comments on the geologic information

  • Geologic Description = The country rocks in, and immediately upstream from, the area of this placer(?) occurrence are Tertiary or Cretaceous granodiorite and quartz diorite; Mesozoic or Paleozoic metasedimentary and metavolcanic rocks and minor marble; and Eocene leucocratic quartz monzonite and granodiorite (Elliott and Koch, 1981; Koch, 1996). No other geologic information about this property was publicly available in 1981 (Elliott and Koch, 1981, loc. 14).
  • Age = Holocene

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Petersburg

Comments on the production information

  • Production Notes = Unknown, but probably small, if any

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010207
USGS Alaska Resource Data File ARDF BC014

Bibliographic references

  • Deposit

    Elliott, R.L., and Koch, R.D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 81-728-B, 23 p., 1 sheet, scales 1:250,000 and 1:63,360.

  • Deposit

    Koch, R.D., 1996, Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 81-728-A, 35 p., 1 sheet, scale 1:250,000.

  • Deposit

    U.S. Bureau of Mines, 1979, Claim map 118: Mines and prospects of the Bradfield Canal quadrangle, Alaska: U.S. Bureau of Mines Open-File Report 20-73, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Elliott and Koch, 1981

General comments

Subject category Comment text
Deposit Model Name = Placer?
Deposit Other Comments = Ten placer(?) claims staked in the valley of Unuk River (U.S. Bureau of Mines, 1979). Occurrence is in Misty Fiords National Monument.

Reporter information

Type Date Name Affiliation Comment
Reporter 17-MAY-1998 H. C. Berg U.S. Geological Survey