Landslide Creek Prospect (east of lower Eureka Glacier), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Landslide Creek Prospect (east of lower Eureka Glacier)	Prospect
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This prospect is at an elevation of about 5,100 feet, about 1.5 miles east of the toe of the Eureka Glacier. It is in the headwaters of informally named Landslide Creek, a south-flowing tributary of Eureka Creek (see figure 3 of Rose (1966 [ADMM GR 20]). The prospect is about one-quarter mile south of the center of section 30, T. 18 S., R. 8 E., Fairbanks Meridian.
Geology: The rock in the area of this prospect consists of Upper Triassic serpentinized peridotite and mafic gabbro interleaved with quartz diorite (Rose, 1966 {ADMM GR 20, figure 3]). The serpentinized rocks, informally called the Eureka ultramafic complex, occupy strands of the Broxson Gulch thrust fault (Nokleberg and others, 1991). Disseminated sulfide minerals are present in several ultramafic lithologies and in skarn of probable ultramafic parentage in upper Landslide Creek. Plagioclase peridotite that contains accessory pyrite, pyrrhotite, pentlandite, and chalcopyrite assayed 0.15 percent copper, 0.35 percent nickel, 0.4 percent chromium, 300 parts per billion (ppb) palladium, and 380 ppb platinum. A sample of magnetite-chalcopyrite-epidote-diopside skarn assayed 0.5 percent copper and 130 ppb gold (Foley and others, 1989; Foley and Summer, 1990; Foley, 1992; W.T. Ellis, unpublished data, 1996).
Workings: The occurrence is on active Fort Knox Gold Resource claims.
Age: Late Triassic, the age of the host rock.
Alteration: All of the ultramafic rock units are moderately to strongly serpentinized; also present is locally developed diopside-epidote skarn.

Commodities (Major) - Cu, Ni, Pd, Pt; (Minor) - Au, Cr
Development Status: None
Deposit Model: Ni-Cu-PGE in differentiated mafic-ultramafic sill.

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Link to USGS - Alaska:	MH106

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References