Notar Prospect, Delta River District, Southeast Fairbanks Borough, Alaska, USA
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Geology: The rock in the area of this prospect consists mainly of Upper Triassic serpentinized dunite that is part of a sill that can be followed for more than 5 miles (Rose, 1966 [ADMM GR 20, figure 3]). The sill is part of the informally named Eureka ultramafic complex (Nokleberg and others, 1991; W.T. Ellis, unpublished data, 1996). The mineral deposit consists of olivine melagabbro that contains as much as 7 percent disseminated sulfides and magnetite. The sulfides are mainly pyrrhotite and small amounts of chalcopyrite and pentlandite. Samples assayed as much as 0.11 percent copper, 0.17 percent nickel, 42 parts per billion (ppb) palladium, and 40 ppb platinum (W.T. Ellis, unpublished data, 1996).
Workings: The prospect is on active MAN Resources claims.
Age: Late Triassic, the age of the host rock.
Alteration: All of the ultramafic rock units are moderately to strongly serpentinized.
Commodities (Major) - Cu, Ni; (Minor) - Pd, Pt
Development Status: None
Deposit Model: Ni-Cu-PGE in differentiated mafic-ultramafic sill.
5 entries listed. 4 valid minerals.
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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. Rose, A.W., 1966, Geological and geochemical investigations in the Eureka Creek and Rainy Creek areas, Mt. Hayes quadrangle, Alaska: Alaska Division of Mines and Minerals Geologic Report 20, 41 p., 3 maps [figures], scale 1:40,000.