Unnamed (southeast of Jimmy Lake)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Pb; Th; U
Other commodities Zn
Ore minerals arsenopyrite; galena; sphalerite; unidentified uranium- and thorium-bearing minerals

Geographic location

Quadrangle map, 1:250,000-scale LH
Quadrangle map, 1:63,360-scale C-1
Latitude 61.6954
Longitude -153.1896
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the south side of the pass between Styx River and South Fork Kuskokwim River valleys, just south of Jimmy Lake. It is at an elevation of about 3,800 feet, 2 miles southeast of Jimmy Lake. The map site is in the NW1/4 section 36, T 19 N, R 22 W, of the Seward Meridian. It is sample locality 25 of Reed and Miller (1980) and is included as an unnamed occurrence by Cobb and Reed (1981). The location is probably accurate to within one quarter of a mile.

Geologic setting

Geologic description

Granite porphyry of the Tertiary Styx River pluton contains 14.8 ppm uranium and 38.3 ppm thorium, and grab samples of radioactive hornblende granite contain as much as 882 ppm uranium (Reed and Miller, 1980; Cobb and Reed, 1981). The uranium is enriched along iron-stained joint surfaces that also contain arsenopyrite, galena, and sphalerite(?). Purple fluorite is an abundant accessory mineral in the granite.
Geologic map unit (-153.191818597319, 61.6947819199493)
Mineral deposit model Fracture-controlled, U-bearing veins in granite
Age of mineralization Tertiary. Uranium is enriched along fractures in Tertiary granite.
Alteration of deposit Oxidation.

Production and reserves

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

References