Reger Pyrrhotite Occurrence, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Reger Pyrrhotite Occurrence	Occurrence
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

See Chip Loy deposit (MG032).
Location: The Reger Pyrrhotite occurrence is located on the west side of Straight Creek Valley about one kilometer southwest of the Chip Loy deposit (MG032)) at an elevation of 3,460 feet (1,055 m) in the NW1/4 sec. 22, T. 24 N., R. 28 W., of the Seward Meridian. Location is based on a description and map provided by Herreid (1968).
Geology: The Reger Pyrrhotite occurrence is in a limestone-slate thermal aureole 760 meters north of the contact of the Middle Fork Plutonic complex (Solie, 1983). A steeply dipping mafic dike of Tertiary (?) age is covered by limonite and contains abundant disseminated pyrrhotite. The sulfide-bearing dike continues upward to an elevation of at least 3,750 feet (1,143 m). Azurite and malachite staining was noted. A sample collected in the mineralized area contains 230 ppm copper and 600 ppm nickel (Herreid, 1968).
Workings: The Reger Pyrrhotite occurrence was found by R.D. Reger during field investigations by the Alaska Department of Natural Resources in 1967 (Herreid, 1968). A sample collected in the mineralized aureole contains 230 ppm copper and 600 ppm nickel.
Age: Unknown; dike rock is undated.
Alteration: Copper bearing sulfides oxidized to azurite and malachite.
Reserves: None.

Commodities (Major) - Cu, Ni; (Minor) - Fe
Development Status: No
Deposit Model: Unknown--possibly disseminated Ni-Cu-PGE type (Cox and Singer, 1986; model 5b).

Other Databases

Link to USGS - Alaska:	MG033

Other Regions, Features and Areas containing this locality

References