PP Diatreme 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 gabbro and serpentinized dunite that are part of a sill that can be traced for more than 5 miles (Rose, 1966 [ADMM GR 20, figure 3]). The sill intrudes Upper Paleozoic metasedimentary rocks and is part of the Eureka ultramafic complex (Nokleberg and others, 1991; W.T. Ellis, oral communication, 1996). The mineralized material is a brecciated diatreme that cuts Upper Paleozoic metasedimentary rock. No sulfides were noted, but there is strong iron staining, and platinum and palladium values are anomalous (794 parts per billion (ppb) platinum and palladium; W.T. Ellis, oral communication, 1996). A sample from this prospect contained 37 ppb gold, 261 ppb platinum, and 533 ppb palladium (W.T. Ellis, oral communication, 2001). The prospect is about 150 south of (below) the north-dipping ultramafic sill that hosts the West Crash prospect (MH110).
Workings: The prospect is on active MAN Resources claims. An anomalous sample from this site contains contained 37 ppb gold, 261 ppb platinum, and 533 ppb palladium (W.T. Ellis, oral communication, 2001).
Age: Probably Late Triassic.
Alteration: Moderate to strong serpentinization.
Commodities (Major) - Pd, Pt; (Minor) - Au
Development Status: None
Deposit Model: Differentiated mafic-ultramafic sill-form Ni-Cu-PGE.
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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.