Unnamed Occurrence (ARDF - MH155; head of the north fork of Ann Creek), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MH155; head of the north fork of Ann Creek)	- not defined -
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is at the head of the north fork of Ann Creek at an elevation of 4,300 feet. It is in the SE1/4SW1/4 section 17, T. 18 S., R. 10 E., Fairbanks Meridian.
Geology: This occurrence consists of sulfide-bearing copper-stained fine-grained sedimentary rocks of the Slana Spur Formation of Pennsylvanian age. Pyrite, pyrrhotite, and chalcopyrite form pods that cut hornfelsed strata below strongly serpentinized peridotite of an Upper Triassic ultramafic-mafic intrusion (W.T. Ellis, oral communication, 2001). Samples of sulfide-bearing sedimentary rocks contain as much as 1.3 percent copper and 629 parts per billion gold.
Workings: Samples of sulfide-bearing sedimentary rocks contain as much as 1.3 percent copper and 629 parts per billion gold (W.T. Ellis, oral communication, 2001).
Age: Probably Late Triassic.
Alteration: The peridotite is serpentinized; the sedimentary rocks are hornfelsed; copper minerals are oxidized.

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

Other Databases

Link to USGS - Alaska:	MH155

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