Unnamed Occurrence (ARDF - MF048; west of Tarr Inlet), Hoonah-Angoon Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MF048; west of Tarr Inlet)	- not defined -
Hoonah-Angoon Census Area	Census Area
Alaska	State
USA	Country

The site is in Glacier Bay National Park and Preserve.
Location: The occurrence is on the west side of Tarr Inlet, about 0.15 mile west of the shore line and about 2.75 miles north of the mouth of Johns Hopkins Inlet. The elevation is approximately 500 feet. The location is known within about 0.25 mile. The location is same as number 41 of Kimball and others (1978), number 62 of MacKevett and others (1971), and number 13 of Cobb (1972).
Geology: The area is mostly underlain by granitic rocks of Cretaceous age (Brew and others, 1978). At the mineral locality, a dike of pegmatitic hornblende diorite 6 feet thick cuts heterogenous diorite. In turn, the pegmatitic diorite contains quartz-calcite veins as much as 0.5 foot thick that contain pyrite and chalcopyrite. The veins contain as much as 2000 ppm copper, a trace of gold, and 300 ppm each of cobalt and nickel (MacKevett and others, 1971, table 9, location 62).
Workings: Surface exposures only. A grab sample of a quartz-calcite vein in pegmatitic diorite contained 2000 ppm Cu, a trace of gold, and 300 ppm each of cobalt and nickel (MacKevett and others, location 62, table 9).
Age: Cretaceous or younger.

Commodities (Major) - Cu; (Minor) - Au, Co, Ni
Development Status: No
Deposit Model: Lode associated with an intrusive of intermediate to mafic composition.

Other Databases

Link to USGS - Alaska:	MF048

Other Regions, Features and Areas containing this locality

References