Unnamed (upper North Crillon Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Fe; Ti
Other commodities Cu
Ore minerals chalcopyrite; ilmenite; magnetite

Geographic location

Quadrangle map, 1:250,000-scale MF
Quadrangle map, 1:63,360-scale C-4
Latitude 58.672
Longitude -137.284
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is on a northwest-facing slope, at an approximate elevation of 3500 feet adjacent to North Crillon Clacier, SW 1/4SW 1/4, section 11, T. 37 S., R. 40 E., of the Copper River Meridian. The location is near sample 38b of Rossman (1963, B 1121-F), location number 6 of Kimball and others (1978), location number 79 of MacKevett and others (1971), and at or near location number 4 of Cobb (1972 MF-436). Kennedy and Walton (1946) reported copper minerals near here. The location is accurate within 0.1 mile.

Geologic setting

Geologic description

The occurrence is in the northwestern part of the Crillon-LaPerouse layered mafic complex (Brew and others, 1978). It is probably about 0.4 miles from the contact of the intrusive, which, in this area, is concealed by the glacier. The occurrence, of heavily disseminated ilmenite in layered mafic rock, is marked by an extensive iron-stained zone. Samples collected by Rossman (1963, B 1121-F, p. F42-F43) from this area contained 7 to 10 percent ilmenite.
The location is somewhat uncertain; sample number 38b is the farthest north sample locality shown by Rossman (1963) in the intrusion, but it has no analytical data. The location is very close to number 79 of MacKevett and others (1971). These authors cite Rossman, also Kennedy and Walton, 1946, for information on mineral occurrences at or near this site.
Geologic map unit (-137.285920576936, 58.6716252889401)
Mineral deposit model Similar to Bushveld Fe-Ti-V (Cox and Singer, 1986; model 3). Segregations of ilmenite-magnetite? in a in a layered mafic-ultramafic intrusion.
Mineral deposit model number 3
Age of mineralization Tertiary.

Production and reserves

Workings or exploration Surface exposures only. Several investigators, including Kennedy and Walton (1946), Rossman (1963 B 1121-F, MacKevett and others (1971), and Kimball and others (1978) reported occurrences of valuable oxide and sulfide minerals in the northwestern contact zone of the Mt. Crillon-LaPerouse complex in rugged country. There is extensive ice cover.
Indication of production None

Additional comments

The site is in Glacier Bay National Park and Preserve.

References