Unnamed (north of North Fork Hot Springs Creek)

Occurrences, Inactive

Commodities and mineralogy

Main commodities Th; U

Geographic location

Quadrangle map, 1:250,000-scale MZ
Quadrangle map, 1:63,360-scale B-3
Latitude 65.2689
Longitude -154.3171
Nearby scientific data Find additional scientific data near this location
Location and accuracy Several occurrences are north of North Fork Hot Springs Creek in sections 34, 35, and 36, T. 2 S., R. 22 E., Kateel River Meridian. This site is located at U.S. Geological Survey sample 78AMM173A (U.S. Geological Survey, 2004). It is at an elevation of about 3,000 feet, in the NE1/4SE1/4 of section 34, T. 2 S., R. 22 E. The location is accurate to within 1,000 feet.

Geologic setting

Geologic description

The area of these occurrences is underlain by the Melozitna pluton, a mid-Cretaceous (111+/-3 Ma), coarse-grained, porphyritic, biotite quartz monzonite and granite stock (Patton and others, 1977). The pluton contains above-average amounts of uranium and thorium (Eberlein and others, 1977). The U.S. Geological Survey sampled the pluton in 1978 during their investigations for uranium in western Alaska. A USGS sample of the granite (sample no. 78AMM173A) contained 97.2 parts per million (ppm) thorium and 37.6 ppm uranium (U.S. Geological Survey, 2004). Other USGS samples contained 72.7 to 173 ppm thorium and 17.6 to 52.1 ppm uranium.
Union Carbide Corp. staked 301 state mining claims in 1977 across this part of the Melozitna pluton (Kardex file 047-014; unpublished record, Alaska Division of Mining, Land & Water). Assessment work in 1978 was filed for 20 claims in the portion of the Hot claim block covering parts of sections 34, 35, and 36, T. 2S., R. 22 E. The 20 man-days of assessment work consisted of ground geologic examination, prospecting, airborne radiometric surveying, ground radiometric surveying, and geochemical sampling.
Geologic map unit (-154.319649123905, 65.2683304147444)
Mineral deposit model Granite-hosted uranium-thorium deposit; thorium-rare earth veins? (Bliss, 1992; model 11d?)
Mineral deposit model number 11d?
Age of mineralization The host rock is dated at 111+/-3 Ma (Patton and others, 1977).

Production and reserves

Workings or exploration The U.S. Geological Survey sampled the Melozitna pluton in 1978 during their investigations for uranium in western Alaska. Union Carbide Corp. staked 301 state mining claims in 1977 across this part of the Melozitna pluton (Kardex file 047-014; unpublished record, Alaska Division of Mining, Land & Water). Assessment work in 1978 was filed for 20 claims in the part of the Hot claim block covering parts of sections 34, 35, and 36, T. 2S., R. 22 E. The assessment work consisted of ground geologic surveys, prospecting, airborne radiometric surveying, ground radiometric surveying, and geochemical sampling.
Indication of production None

References