Unnamed (north wall of South Crillon Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Ni
Ore minerals chalcopyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale MF
Quadrangle map, 1:63,360-scale C-4
Latitude 58.637
Longitude -137.309
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is on the north wall of Crillon Glacier 5.35 miles west- southwest of the summit of Mt. Crillon. It is at an elevation of about 3200 feet at the contact of the Crillon-La Perouse layered complex with schist. The occurrence is accurate to about 0.2 mile. The location is approximately the same as number 80 of MacKevett and others (1971) and number 3 of Cobb (1972). The occurrence is approximately 0.2 mile southwest of MF005, an occurrence of nickel and copper.

Geologic setting

Geologic description

Mineralized layered gabbro near the western contact of Crillon-La Perouse layered mafic-ultramafic body contains 5-6 percent of disseminated pyrrhotite and chalcopyrite. The sulfide minerals probably are magmatic segregations. The area is near the part of the stock described by Rossman (1963, B 1121-F, p. F42-43).
Geologic map unit (-137.310929276595, 58.6366313469279)
Mineral deposit model Copper-nickel? segregation deposit in a layered mafic-ultramafic intrusive.
Age of mineralization Tertiary.

Production and reserves

Workings or exploration There are no workings. Direct knowledge of this occurrence is based on sampling of R. H. Goldthwait of the Harvard-Dartmouth Expedition cited by Kennedy and Walton (1946, p. 71), who reported 5 to 6 percent of sulfides, pyrrhotite and chalcopyrite, near the contact of the intrusive. No other party has been able to reach the Goldthwait occurrence.
Indication of production None

Additional comments

Site has been inaccessible because of rock falls since the early examination by Goldthwait. It is close enough to the nickel-copper deposit at locality MF005 to suggest the possible continuity of mineralization in this part of the layered complex. The site is in Glacier Bay National Park and Preserve.
Kennedy and Walton (1946) cite an unpublished report by Goldthwait that may be in Dartmouth or Harvard Expedition files.

References