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 B-3
Latitude 61.4552
Longitude -154.1089
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at the head of an unnamed southeast tributary to the Swift River. It is at an elevation of about 3,350 feet, 1.7 miles northwest of peak 7646. The map site is in the NW1/4 section 27, T 16 N, R 27 W, of the Seward Meridian. This is locality 2 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 (-154.111177413948, 61.4545343047158)
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 in age (Reed and Lanphere, 1973).

Production and reserves

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

References