Northland Mines Prospect, Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Northland Mines Prospect	Prospect
Chistochina Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This prospect is on the north side of Powell Gulch about 0.7 mile northeast of its mouth. It is in the NW1/4SE1/4 section 35, T. 20 S., R. 15 E., Fairbanks Meridian. The prospect is near locality 31 of Rose (1967), locality 20 on figure 6 of Cobb (1979 [OFR-238]), and locality 139 in table 2 of Nokleberg and others (1991). It is within a claim block, and the location is accurate.
Geology: The rocks in the area include limestone and volcanic rocks, both possibly part of the Slana Spur Formation of Pennsylvanian and Early Permian age (Richter and Dutro, 1975; Nokleberg and others, 1991). Rose (1967) did not visit the site but was shown specimens of chalcopyrite replacing silicified limestone. The site was visited later by the U.S. Geological Survey (Nokleberg and others, 1991). A skarn-like deposit occurs beneath a topographic dip slope about 75 feet wide and 270 feet long. Veins as much as about 3 feet wide of chalcopyrite and massive hematite cut garnet skarn in limestone. A grab sample of chalcopyrite-bearing rock associated with massive hematite assayed 1.5 percent copper, 100 parts per million (ppm) tungsten, and 7 ppm silver (Nokleberg and others, 1991, table 2). The mineralization is epigenetic and of Early Permian or younger age.
Workings: Shallow pits.
Age: Early Permian or younger.
Alteration: Skarn; silicates formed in limy host rock.

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

Other Databases

Link to USGS - Alaska:	MH300

Other Regions, Features and Areas containing this locality

References