West Crash Prospect, Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
West Crash Prospect	Prospect
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: The West Crash prospect is at an elevation of about 5,200 feet and about midway between Broxson Gulch and lower Eureka Glacier. It is northeast of locally named Landslide Creek, a south-flowing tributary of Eureka Creek (see figure 3 of Rose, 1966 [ADMM GR 20]). The prospect is about one-third mile east-northeast of the center of section 32, T. 18 S., R. 8 E., Fairbanks Meridian.
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 followed for more than 5 miles (Rose, 1966 [ADMM GR 20, figure 3]). The sill is part of the informally named the Eureka ultramafic complex (Nokleberg and others, 1991; W.T. Ellis, unpublished data, 1996).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as 0.3 percent copper, 0.11 percent nickel, 100 parts per billion (ppb) palladium, and 80 ppb platinum (W.T. Ellis, unpublished data, 1996).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, Pd, Pt
Development Status: None
Deposit Model: Ni-Cu-PGE in differentiated mafic-ultramafic sill.

Other Databases

Link to USGS - Alaska:	MH110

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References