White Band Occurrence (east of upper North Fork Rainy Creek), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
White Band Occurrence (east of upper North Fork Rainy Creek)	Occurrence
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is on the east valley wall of the upper North Fork Rainy Creek valley at an elevation of 4,800 feet. It is in the NW1/4NW1/4 section 31, T. 18 S., R. 10 E., Fairbanks Meridian.
Geology: This occurrence consists of 2 to 3 percent of disseminated pyrite, pyrrhotite, and chalcopyrite in a white marker band of anothorositic gabbro in a feldspathic peridotite unit near the southern north-dipping contact of the Rainy ultramafic-mafic intrusive of Late Triassic age (W.T. Ellis, oral communication, 2001). The gabbro is locally copper stained. Samples of sulfide-bearing anothorositic gabbro contained 3,688 parts per billion (ppb) gold, 210 ppb palladium, 95 ppb platinum, 0.27 percent copper, and 0.11 percent nickel (W.T. Ellis, oral communication, 2001).
Workings: Samples of sulfide-bearing anothorositic gabbro contained 3,688 parts per billion (ppb) gold, 210 ppb palladium, 95 ppb platinum, 0.27 percent copper, and 0.11 percent nickel (W.T. Ellis, oral communication, 2001). The occurrences are on active claims of MAN Resources.
Age: Late Triassic.
Alteration: The olivine-bearing ultramafic rocks are variably serpentinized; copper minerals are locally oxidized.

Commodities (Major) - Au, Cu, Ni, Pd, Pt
Development Status: No
Deposit Model: Ni-Cu-PGE in differentiated mafic-ultramafic sill.

Other Databases

Link to USGS - Alaska:	MH158

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