Latitude & Longitude (WGS84):
63° 18' 56'' North , 146° 3' 7'' West
Latitude & Longitude (decimal):
Mindat Locality ID:
201227
Long-form identifier:
mindat:1:2:201227:1
Location: This occurrence is at an elevation of 4,350 feet in an unnamed upper west fork of Specimen Creek, in the NE1/4NE1/4 section 32, T. 18 S., R. 9 E., Fairbanks Meridian. The occurrence corresponds to locality 53 in table 2 of Nokleberg and others (1991).
Geology: The rock at this site consists of olivine cumulate in dunite or peridotite that is part of an Upper Triassic ultramafic intrusive complex (W.T. Ellis, unpublished data, 1996). The olivine cumulate is brecciated and sheared in a zone traceable for about 50 feet on strike. Grab sample 79CH009C of sheared ultramafic rock contained more than 5,000 parts per million (ppm) chromium and 50 ppm tin (Nokleberg and others, 1991, locality 53, table 2).
Workings: The occurrence is on active MAN Resources claims.
Age: The chromite is Late Triassic, the presumed age of the ultramafic host rock. The copper and gold are Late Triassic or younger. The shear-controlled mineralization is possibly younger.
Commodities (Major) - Cr; (Minor) - Sn
Development Status: None
Deposit Model: Disseminated chromite in ultramafic rocks; epigenetic (?) shear zone mineralizat
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This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
1 valid mineral.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
List of minerals for each chemical element
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| Link to USGS - Alaska: | MH138 |
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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.
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844.
doi:10.2138/am-2024-9486.
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