Unnamed Occurrence (ARDF - MH122; ridge between middle and east forks in Broxson Gulch), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MH122; ridge between middle and east forks in Broxson Gulch)	- not defined -
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: The occurrence is at an elevation of about 4,900 feet on the ridge between the locally named middle fork and the east fork of the stream(s) in Broxson Gulch (see figure 2 of Rose, 1965). The occurrence is in the SE1/4NE1/4 section 19, T. 18 S., R. 9 E., Fairbanks Meridian; it corresponds to locality 46 in table 2 of Nokleberg and others (1991).
Geology: A fault-bottomed block of Upper Triassic cumulate gabbro and melagabbro overlies the Slana Spur Formation of Late Paleozoic age at this site (Rose, 1965, figure 2; Nokleberg and others, 1991). The olivine cumulate contains disseminated chromite. Sample 79NK009A of the cumulate assayed more than 5,000 parts per million chromium (Nokleberg and others, 1991, locality 46, table 2). Stream-sediment sample 282 collected a few hundred feet north of the site was moderately anomalous in lead (Rose, 1965).
Workings: The occurrence 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) - Cr; (Minor) - Pb
Development Status: None
Deposit Model: Chromite disseminated in layered mafic-ultramafic complex.

Other Databases

Link to USGS - Alaska:	MH122

Other Regions, Features and Areas containing this locality

References