Super Cub Ridge Occurrence, Tok Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Super Cub Ridge Occurrence	Occurrence
Tok Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Unpublished data cited is available for viewing by contacting Grayd Resources Inc. in Vancouver, B. C., Canada (www.grayd.com), or Northern Associates Inc. in Fairbanks, Alaska.
Location: The Super Cub Ridge occurrence is about 2.5 miles southeast of the confluence of the Robertson River and Rumble Creek at an elevation of about 5,500 feet. It is about one-half mile north-northeast of the center of section 9, T. 17 N., R. 7 E., Copper River Meridian. The location is accurate.
Geology: Pods of pyrrhotite-magnetite skarn occur in the Tushtena Pass unit at the contact with a gabbroic sill (S.S. Dashevsky, written communication, 2002). The Tushtena Pass unit consists mainly of medium- to coarse-grained calcareous quartz-sericite-chlorite schist with carbonate interbeds. The schist is typically green to gray and laminated to layered and contains quartz eyes. Discontinuous bands of siliceous limestone, dolomitic marble, and black pyritic metasiltstone are common. A poorly exposed graphitic member in its upper part is a stratigraphic marker that can be traced by electromagnetic surveys. Quartz-carbonate veins and bands are characteristic of the Tushtena Pass unit. It is intruded and thickened by gabbroic sills and dikes, many of which are associated with local hornfelsing in nearby rocks.
Age: Mid-Triassic, on the basis of the U-Pb zircon age of gabbroic bodies that are related to this deposit (Dashevsky and others, 2003).

Commodities (Major) - Fe; (Minor) - Zn
Development Status: None
Deposit Model: Iron skarn (Cox and Singer, 1986; model 18d).

Other Databases

Link to USGS - Alaska:	MH331

Other Regions, Features and Areas containing this locality

References