|Quadrangle map, 1:250,000-scale||MF|
|Quadrangle map, 1:63,360-scale||C-4|
|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.|
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.|
|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 commentsThe site is in Glacier Bay National Park and Preserve.
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., 7 sheets.
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.
Kennedy, G.C., and Walton, M.S., Jr., 1946, Geology and associated mineral deposits of some ultrabasic rock bodies in southeastern Alaska: U.S. Geological Survey Bulletin 947-D, p. 65-84.
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.
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.
|Reporters||C.C. Hawley (Hawley Resource Group)|
|Last report date||4/9/1999|