Unnamed (southeast of upper Finger Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Ni
Ore minerals chalcopyrite; pentlandite or nickeliferous pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale MF
Quadrangle map, 1:63,360-scale C-4
Latitude 58.51
Longitude -137.05
Nearby scientific data Find additional scientific data near this location
Location and accuracy The deposit is probably on the south slope of a 7200-foot mountain about 3.5 miles south-southeast of the peak of Mt. LaPerouse in the NE 1/4, SW 1/4, section 6, T. 39 S., R. 51 E., of the Copper River Meridian. The location is based on a description by Leo Mark-Anthony (1977), but it is uncertain because the description of the site reported in Kimball and others (1978, location 14) does not match Mark-Anthony's elevation or approximate coordinates.

Geologic setting

Geologic description

Based on its reported location, the occurrence is in the central part of the Crillon-LaPerouse layered mafic-ultramafic intrusion of Tertiary age. The occurrences were described as 'lenses of nickel-bearing pyrrhotite in diorite within the mafic intrusion' (Mark-Anthony, 1977; also, communication Leo Mark-Anthony, 1998). A sample collected by Mark-Anthony contained 0.83 percent nickel and 0.18 percent copper. Copper is abundant enough to form a separate phase, probably chalcopyrite.
Geologic map unit (-137.051909312591, 58.5096329301)
Mineral deposit model Disseminated copper and nickel-bearing minerals in dioritic phase? of layered mafic intrusive.
Age of mineralization Tertiary.

Production and reserves

Workings or exploration Surface exposure of mineralized rock; no workings.
Indication of production None
Reserve estimates Possible reserves contained in sulfide-bearing lenses as much as 10 feet thick and traceable for 500 feet.

Additional comments

Chugach terrane. The location is in Glacier Bay National Park and Preserve.

References

MRDS Number A013135

References

Mark-Anthony, Leo, 1977, Maps and notes on investigations in Glacier Bay, 1958-1960. (Unpublished material available at U.S. Bureau of Land Management library, Juneau, Alaska).
Reporters C.C. Hawley (Hawley Resource Group)
Last report date 4/5/1999