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Unnamed (west of North Fork Rainy Creek)

Occurrence, Active

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Commodities and mineralogy

Main commodities Cr
Ore minerals chromite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.309
Longitude -145.9804
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,350 feet at the head of an unmapped east -flowing tributary of North Fork Rainy Creek. It is in the NW1/4SW1/4 section 35, T. 18 S., R. 9 E., Fairbanks Meridian. It corresponds to locality S65 in table 2 of Nokleberg and others (1991).

Geologic setting

Geologic description

This occurrence is in Late Triassic gabbro that intrudes the Slana Spur Formation of Pennsylvanian age (Nokleberg and others, 1991). The occurrence consists of a silicified zone 6.5 feet wide by 10 feet long in gabbro. Grab sample 79NK014B collected by the U.S. Geological Survey contains more than 5,000 parts per million chromium (Nokleberg and others, 1991). Chromite is probably sparsely disseminated in gabbro at the site.
Geologic map unit (-145.982660571092, 63.3085814821053)
Mineral deposit model Disseminated chromite in a layered mafic-ultramafic complex.
Age of mineralization Late Triassic.
Alteration of deposit The alteration consists of a silicified zone 2 meters wide by 3 meters long in the gabbro.

Production and reserves

Workings or exploration The occurrence is on active claims of MAN Resources.
Indication of production None

References

References

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 6/7/2002