Unnamed (west mouth of Rendu Inlet)

Occurrence in Alaska, United States with commodities Copper, Cobalt, Nickel

Geologic information

Identification information

Deposit ID 10002264
MRDS ID A013167
Record type Site
Current site name Unnamed (west mouth of Rendu Inlet)
Related records 10258223

Geographic coordinates

Geographic coordinates: -136.63017, 58.91278 (WGS84)
Relative position The occurrence is near sea level at the west mouth of Rendu Inlet 0.45 miles northeast of VABM Rendu. It is about 1.5 miles north of the point between Rendu Inlet and Glacier Bay. The location is probably accurate within 0.1 mile. The location is number 38 of MacKevett and others (1971), number 33 0f Cobb (1972), and number 43 of Kimball and others (1978).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Cobalt Secondary
Nickel Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore

Alteration

  • (Local) Bleaching of marble near sulfidized zones.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Marble

Nearby scientific data

(1) -136.63017, 58.91278

Comments on the geologic information

  • Geologic Description = Iron-stained pyritic zones up to 20 feet long and 1 foot thick occur in bleached marble of the Paleozoic marble and hornfels unit of Brew and others (1978). The unit is probably correlative with post-Silurian pre-Triassic limestone of Seitz (1959). The bedded rocks are intruded by granitic rocks of Cretaceous age. A pyritic zone containing minor chalcopyrite and possibly pyrrhotite was sampled by MacKevett and others (1971, table 9). A selected sample from a thin pyrite-rich lens contained 1500 ppm copper, 700 ppm cobalt, and 1000 ppm nickel, suggesting the prescence of nickeliferous pyrrhotite as an additional phase.
  • Age = Cretaceous or younger.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau

Comments on the workings information

  • Workings / Exploration = Surface exposures only, 2 samples collected (MacKevett and others, 1971).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013167
USGS Alaska Resource Data File ARDF MF056

Bibliographic references

  • Deposit

    Seitz, J.F., 1959, Geology of Geikie Inlet area, Glacier Bay, Alaska: U.S. Geological Survey Bulletin 1058-C, p. 61-120.

  • Deposit

    MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.

  • Deposit

    Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.

  • Deposit

    Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = MacKevett and others, 1971

General comments

Subject category Comment text
Deposit Other Comments = Paleozoic marble invaded by granitic plutons of Cretaceous age. The area is in Glacier Bay National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 09-APR-99 Hawley, C.C. Hawley Resource Group