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

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

Location: The Lower Crash prospect is at an elevation of about 4,700 feet and is about midway between Broxson Gulch and lower Eureka Glacier. It is on the east side of a southeast-flowing tributary of Eureka Creek that is locally called Landslide Creek. The prospect is in the E1/2NW1/4 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 sepentinized dunite what are part of a sill that can be traced for more than 5 miles (Rose, 1966 [ADMM GR 20, figure 3]). The sill is part of the Eureka ultramafic complex (Nokleberg and others, 1991; W.T. Ellis, unpublished data, 1996). The deposit consists of iron-stained olivine-rich peridotite that contains disseminated sulfides and magnetite. The sulfides are mainly pyrrhotite and small amounts of chalcocite and pentlandite. A sample from the prospect contains 0.23 percent copper, 0.39 percent nickel, 193 parts per billion (ppb) palladium, 157 ppb platinum, and 101 ppb gold (W.T. Ellis, oral communication, 2001).
Workings: The prospect is on active MAN Resources claims. A sample from the prospect contains 0.23 percent copper, 0.39 percent nickel, 193 parts per billion (ppb) palladium, 157 ppb platinum, and 101 ppb gold (W.T. Ellis, oral communication, 2001).
Age: Late Triassic.
Alteration: Moderate to strong serpentinization.

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

Other Databases

Link to USGS - Alaska:	MH108

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