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Unnamed (Rainbow Ridge south of Rainbow Mountain)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.2798
Longitude -145.623
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 4,500 feet on the southwest part of Rainbow Ridge, about 2.1 miles south of the top of Rainbow Mountain. It is at the center of the SW1/4 section 10, T. 19 S., R. 11 E., Fairbanks Meridian. The occurrence is described by Hanson (1963, p. 67), and it corresponds to locality S114 of table 2 in Nokelberg and others (1991).

Geologic setting

Geologic description

This occurrence consists of pyrite and chalcopyrite disseminated in dacite tuff (Hanson, 1963, p. 67). The dacite tuff is part of the Slana Spur Formation of Pennsylvanian age (Nokleberg and others 1991). This occurrence is one of the four prominent areas of pyrite and chalcopyrite disseminated in dacitic tuff noted by Hanson (1963, p. 67, figure 5).
Geologic map unit (-145.625246454901, 63.2793874668509)
Mineral deposit model Porphyry Cu (Cox and Singer, 1986; model 17).
Mineral deposit model number 17
Age of mineralization Pennsylvanian or younger.

Production and reserves

Indication of production None

References

References

Hanson, L.G., 1963, Bedrock geology of the Rainbow Mountain area, Alaska Range, Alaska: Alaska Division of Mines and Minerals Geologic Report 2, 82 p., 2 plates.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.
Reporters W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date 8/9/2002