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Unnamed (on southeast side of Latouche Island)

Occurrence in Alaska, United States with commodity Copper
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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
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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