Unnamed Occurrence (ARDF - MH294; northeast of Slate Creek), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MH294; northeast of Slate Creek)	- not defined -
Chistochina Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is south of the terminus of the Chistochina Glacier at an elevation of about 4,600 feet. It is about 1.1 miles northeast of the mouth of Slate Creek and about one-half mile southwest of informally named Big Four Creek, in the NW1/4SW1/4 of sec. 14, T. 20 S., R. 15 E., Fairbanks Meridian. It corresponds to locality 23 of Rose (1967), locality 13 on figure 6 of Cobb (1979 [OFR 79-238]), and locality 135 of Nokleberg and others (1991). The location is probably accurate within 0.2 mile.
Geology: This occurrence is in a body of gabbro and mafic gabbro that is about a mile wide and possibly elongated to the northeast (Rose, 1967). The gabbro is probably Late Triassic in age. The mafic intrusive is overlain unconformably by the 'round wash' conglomerate of Tertiary age. The same gabbro body forms the bedrock in the Big Four Creek placer deposit (MH293). Chalcopyrite and secondary copper minerals, probably including malachite, occur in a vein or in a vuggy epidote-filled segregation in gabbro.
Workings: No workings are reported.
Age: Late Triassic or younger, on the basis of the age of the host rock.
Alteration: Alteration consists of epidote-filled veining or segregations in gabbro.

Commodities (Major) - Cu
Development Status: No

Other Databases

Link to USGS - Alaska:	MH294

Other Regions, Features and Areas containing this locality

References