Unnamed Occurrence (ARDF - MH141; east of Specimen Creek), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MH141; east of Specimen 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 about 5,200 feet on an east-west-trending ridge east of Specimen Creek, in the SW1/4NW1/4 section 3, T. 19 S., R. 9 E., Fairbanks Meridian. This occurrence corresponds to locality 10 on figure 2 of Rose (1965), locality 43 on figure 4 of Cobb (1979 [OFR 79-238), and locality 63 in table 2 of Nokleberg and others (1991).
Geology: The rocks in the area of this occurrence consist of a limestone mass of the Slana Spur Formation of Late Paleozoic age engulfed in mafic-ultramafic intrusive rock of the Upper Triassic Eureka complex. The rocks at this deposit consist of sulfide-bearing skarn composed chiefly of brown garnet and greenish pyroxene, highly pyritized limestone (?) that overlies the skarns, and a capping sequence of nearly unaltered limestone. Float collected below the skarn contains pyrite and pyrrhotite and lesser amounts of chalcopyrite and marcasite (Rose, 1965).
Workings: The occurrence is on active MAN Resources claims.
Age: Late Triassic, the age of the mafic-ultramafic intrusive rocks.
Alteration: Sulfide minerals are disseminated in a matrix of brown garnet and greenish pyroxene skarn. Limestone overlying the skarn is pyritized.

Commodities (Major) - Cu
Development Status: None
Deposit Model: Skarn affiliated with mafic-ultramafic intrusive rocks.

Other Databases

Link to USGS - Alaska:	MH141

Other Regions, Features and Areas containing this locality

References