Unnamed (on southeast side of Latouche Island)

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10307302
Record type Site
Current site name Unnamed (on southeast side of Latouche Island)

Geographic coordinates

Geographic coordinates: -147.9125, 59.97955 (WGS84)
Relative position The occurrence is located on the southeast side of Latouche Island in the E1/2 of section 28, T. 2 S., R. 9 E., of the Seward Meridian. This occurrence is described as a landslide block of unknown size (Nelson and others, 1984). This location is accurate to within a half a mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrrhotite Ore

Alteration

  • (Local) None reported.

Mineral occurrence model information

Model code 91
USGS model code 24b
Deposit model name Massive sulfide, Besshi (Japanese deposits)
Mark3 model number 30

Nearby scientific data

(1) -147.9125, 59.97955

Comments on the geologic information

  • Geologic Description = The occurrence is on a landslide block of slate and graywacke of the Tertiary Orca Group which contains three beds with chalcopyrite and pyrrhotite that are conformable to the bedding. The beds are up to 2 foot wide and extend along strike for 500 feet. A 20 foot wide chip sample across all three zones contained 2.5% copper and 18 ppm silver (Nelson and others, 1984). Other limonite-stained rock are exposed in this area.
  • Age = Tertiary.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Comments on the workings information

  • Workings / Exploration = None reported.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF BS001

Bibliographic references

  • Deposit

    Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, scale 1:250,000.

  • Deposit

    Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Nelson and others, 1985

General comments

Subject category Comment text
Deposit Model Name = Besshi massive sulfide (Cox and Singer, 1986; model 24b).

Reporter information

Type Date Name Affiliation Comment
Reporter 15-MAR-99 Jeff A. Huber U.S. Geological Survey