Unnamed Occurrence (ARDF - MH120; 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 - MH120; 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: This occurrence is at an elevation of 5,350 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 SE1/4SW1/4 section 17, T. 18 S., R. 9 E., Fairbanks Meridian; it corresponds to locality 48 in table 2 of Nokleberg and others (1991).
Geology: The rock at this occurrence is Upper Triassic gabbro and peridotite that intrudes Upper Triassic metabasalt (Nokleberg and others, 1991). The gabbro forms a sill-like body more than 1,000 feet long and 10 feet thick. It is sheared and highly iron stained and contains disseminated pyrite and possibly pyrrhotite. Grab sample 79NK008A of mineralized gabbro assayed 0.15 percent nickel, 3 parts per million (ppm) silver, and 0.10 ppm gold (Nokleberg and others, 1991, locality 48, table 2).
Workings: The occurrence is on active MAN Resources claims.
Age: Late Triassic, the age of the host rock.
Alteration: Pyritization and iron staining of host rock.

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

Other Databases

Link to USGS - Alaska:	MH120

Other Regions, Features and Areas containing this locality

References