Unnamed Occurrence (ARDF - LH013; southeast of Jimmy Lake), McGrath Mining District, Bethel Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - LH013; southeast of Jimmy Lake)	- not defined -
McGrath Mining District	Mining District
Bethel Census Area	Census Area
Alaska	State
USA	Country

Location: 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.
Geology: 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.
Workings: Reconnaissance sampling has been completed in this area.
Age: Tertiary. Uranium is enriched along fractures in Tertiary granite.
Alteration: Oxidation.

Commodities (Major) - Pb, Th, U; (Minor) - Zn?
Development Status: None
Deposit Model: Fracture-controlled, U-bearing veins in granite

Other Databases

Link to USGS - Alaska:	LH013

Other Regions, Features and Areas containing this locality

References