Unnamed Occurrence (ARDF - MH125; upper Specimen Creek), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MH125; upper Specimen Creek)	- not defined -
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This prospect is at an elevation of 4,400 feet in the headwaters of an unnamed west fork of Specimen Creek, in the NW1/4NE1/4 section 32, T. 18 S., R. 9 E., Fairbanks Meridian. The occurrence corresponds to localities 51 and 52 in table 2 of Nokleberg and others (1991).
Geology: The rock at this occurrence consists of Upper Triassic olivine cumulate intruded by a metadiabase dike (Nokleberg and others, 1991). Rose (1965, figure 2) mapped a peridotite body in the headwaters of Specimen Gulch. The olivine cumulate contains disseminated chromite; sample 79CH010B assayed more than 5,000 parts per million chromium (Nokleberg and others, 1991). Malachite occurs along fractures in the metadiabase dike; grab sample 79CH010C of dike material contained 150 parts per billion gold.
Workings: The occurrence is on active MAN Resources claims.
Age: The chromite is Late Triassic, the presumed age of the ultramafic host rock. The copper and gold are Late Triassic or younger.
Alteration: Oxidation of copper mineral(s).

Commodities (Major) - Au, Cr; (Minor) - Cu
Development Status: None
Deposit Model: Disseminated chromite in ultramafic rocks; epigenetic (?) shear zone mineralizat

Other Databases

Link to USGS - Alaska:	MH125

Other Regions, Features and Areas containing this locality

References