Unnamed (on Davidof and Lopy Islands)

Occurrence in Alaska, United States with commodities Iron, Copper, Lead, Zinc

Geologic information

Identification information

Deposit ID 10308194
Record type Site
Current site name Unnamed (on Davidof and Lopy Islands)

Geographic coordinates

Geographic coordinates: -178.37033, 51.96687 (WGS84)
Relative position This site represents northern tip of Davidof Island and the southern 1/2.of Lopy Island (located about 1000 feet north of Davidson Island). Site location is accurate to within 1000 feet.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Iron Primary
Copper Secondary
Lead Secondary
Zinc Secondary

Alteration

  • (Local) The original flow rocks have been intensely altered to iron oxides, chlorite, magnetite, and quartz. The iron oxides may have resulted from the weathering of pyrite.

Nearby scientific data

(1) -178.37033, 51.96687

Comments on the geologic information

  • Geologic Description = Davidof and Lopy Island consist entirely of Late Tertiary to Quaternary andesitic lava flows and pyroclastic rocks (Nelson, 1959). A large percentage of the rocks on the northern tip of Davidof Island and on the southern 1/2 of Lopy Island have been intensely altered to various shades of yellow, orange, and brown. Some of these altered zones may contain traces of copper, lead, and zinc. The most intensely altered rock consists entirely of iron oxide, chlorite, magnetite, and quartz.
  • Ore Material = Iron-oxides
  • Age = Late Tertiary or Quaternary.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Aleutian Islands

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF RI003

Bibliographic references

  • Deposit

    Nelson, S.W., Nokleberg, W.J., Miller-Hoare, M., and Mullen M.W., 1979, Siniktanneyak Mountain ophiolite, in Johnson, K.M. and Williams, J.R., The United States Geological Survey in Alaska, Accomplishments during 1978: U.S. Geological Survey Circular 804-B, p. B14-B16

Comments on the references

  • Primary Reference = Nelson, 1959

General comments

Subject category Comment text
Deposit Other Comments = Site is located within the Alaska Maritime Natural Wildlife Refuge.

Reporter information

Type Date Name Affiliation Comment
Reporter 24-JAN-00 S.H. Pilcher U.S. Geological Survey