Unnamed (near Swift River)

Occurrence, Inactive

Commodities and mineralogy

Other commodities REE
Ore minerals allanite; monazite; xenotime

Geographic location

Quadrangle map, 1:250,000-scale LH
Quadrangle map, 1:63,360-scale C-4
Latitude 61.547
Longitude -154.2225
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is in a small cirque valley at the head of an unnamed east tributary to the Swift River. It is at elevation of 4,200 feet, 0.5 mile east of peak 5848. The map site is in the SW1/4 section 20, T 17 N, R 27 W, of the Seward Meridian. This is locality 1 of Cobb (1972 [MF 412]; 1976 [OF 76-485]). The location is probably accurate to within a quarter of a mile.

Geologic setting

Geologic description

Reed and Anderson (1969) reported that biotite granite of the Tired Pup pluton contains abundant accessory allanite and monazite and (or) xenotime. The Tired Pup pluton is a Lower Tertiary pluton of the Alaska-Aleution Range batholith (Reed and Lanphere, 1973).
Geologic map unit (-154.22477376498, 61.5463371668032)
Mineral deposit model Disseminated accessory minerals in granite
Age of mineralization Early Tertiary. Several K-Ar ages from the Tired Pup pluton are about 55 to 60 Ma (Reed and Lanphere, 1973).

Production and reserves

Workings or exploration Reconnaissance sampling has been completed in this area.
Indication of production None