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Unnamed (southeast end of Rainbow Ridge)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Cu; Pb
Other commodities Au
Ore minerals chalcopyrite; galena
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.2713
Longitude -145.5878
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 5,000 feet near the southeast end of Rainbow Ridge. It is on the southwest valley wall of upper McCallum Creek in the SE1/4NW1/4 section 14, T. 19 S., R. 11 E., Fairbanks Meridian. The occurrence is described by Hanson (1963, locality 10), and it corresponds to locality 25 in Cobb (1979 [OFR 79-238]) and locality S120 in table 2 of Nokelberg and others (1991).

Geologic setting

Geologic description

This occurrence consists of chalcopyrite and galena in several small irregular quartz veins that strike N20E and dip vertically (Hanson, 1963). The veins occur along a fault in limestone of the Slana Spur Formation of Pennsylvanian age (Nokleberg and others, 1991). Samples of the mineralized veins assayed 0.3 to 0.4 percent copper, 2.5 to 2.6 percent lead, a trace of gold, and as much as 1.4 ounces of silver per ton (Hanson, 1963).
Geologic map unit (-145.590043910535, 63.2708877234739)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Pennsylvanian or younger.

Production and reserves

Workings or exploration Samples of the mineralized veins assayed 0.3 to 0.4 percent copper, 2.5 to 2.6 percent lead, a trace of gold, and as much as 1.4 ounces of silver per ton (Hanson, 1963).
Indication of production None

References

MRDS Number A011802

References

Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-238, 140 p.
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