BGM Breccia Occurrence, Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
BGM Breccia Occurrence	Occurrence
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: The BGM Breccia occurrence is at an elevation of 4,500 feet in the headwaters of an unnamed east tributary to the east fork of the stream in Broxson Gulch, about 800 feet north-northeast of peak 4825 in the SE1/4SW1/4 section 29, T. 18 S., R. 9 E., Fairbanks Meridian.
Geology: The Airstrip Fault (Rose 1965, figure 2) is subparallel to the gulch that hosts this occurrence. Rocks south of the fault include Upper Triassic melagabbro and peridotite. Float in the upper creek contains mineralized magmatic-breccia cobbles and boulders with dunite and gabbro clasts in a coarse-grained pyroxene-rich matrix (W.T. Ellis, unpublished data, 1996). A grab sample of breccia containing about 4 percent total sulfide assayed 0.43 percent copper, 0.88 percent nickel, 412 parts per billion (ppb) palladium, and 245 ppb platinum. Pyrrhotite is the dominant sulfide, along with minor pentlandite, pyrite, and chalcopyrite. The ultramafic host rocks are serpentinized.
Workings: The occurrence is on active MAN Resources claims.
Age: Late Triassic, the age of the host breccia.
Alteration: The ultramafic host rocks are 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:	MH124

Other Regions, Features and Areas containing this locality

References