Unnamed Occurrence (ARDF - MH151; west of upper North Fork Rainy Creek), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MH151; west of upper North Fork Rainy Creek)	- 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 5,250 feet on a steep ridge on the west side of upper North Fork Rainy Creek. It is in the SE1/4SW1/4 section 26, T. 18 S., R. 9 E., Fairbanks Meridian. It is approximately 500 feet up-slope and northwest of locality 4 of Rose (1965); see MH150.
Geology: At this occurrence garnet-skarn-hosted massive sulfide bands as much as one meter wide by several meters long strike northwest (Rose, 1965). An Upper Triassic gabbro crops out a few meters away across talus where it intrudes the Slana Spur Formation of Pennsylvanian age (Nokleberg and others, 1991). Other sulfide bands crop out about 500 feet down-slope in a similar setting. A grab sample of massive chalcopyrite, pyrite, and bornite assayed 0.6 percent copper, 0.2 percent cobalt, and 0.9 ounce of silver per ton (Nokleberg and others, 1991).
Workings: A U.S. Geological Survey grab sample of massive chalcopyrite, pyrite, and bornite assayed 0.6 percent copper, 0.2 percent cobalt, and 0.9 ounce of silver per ton (Nokleberg and others, 1991). The occurrence may be on active claims of MAN Resources.
Age: Late Paleozoic or Late Triassic.
Alteration: A garnet-calcite skarn has developed at this prospect.

Commodities (Major) - Ag, Au, Co, Cu
Development Status: No
Deposit Model: Cu skarn (Cox and Singer, 1986; model 18b).

Other Databases

Link to USGS - Alaska:	MH151

Other Regions, Features and Areas containing this locality

References