Unnamed (on Slate Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Th
Other commodities REE
Ore minerals allanite; monazite

Geographic location

Quadrangle map, 1:250,000-scale EA
Quadrangle map, 1:63,360-scale C-4
Latitude 64.6786
Longitude -142.7146
Nearby scientific data Find additional scientific data near this location
Location and accuracy Slate Creek is a 35-mile-long tributary of the North Fork of the Fortymile River. This occurrence is located in upper Slate Creek, just above the mouth of Ben Creek, in section 3, T. 3 S., R. 25 E., of the Fairbanks Meridian. The location is accurate within 1 mile. Slate Creek is locality 40 of Cobb (1972 [MF-393]).

Geologic setting

Geologic description

The rocks in upper Slate Creek are granitic rocks of probable Mesozoic age and Paleozoic schist, quartzite, and marble (Foster, 1976). Biotite from the nearby Ruby Creek granite give a 40Ar/39Ar plateau age of 102.1 +/- 0.4 Ma (Newberry and others, 1996). In 1949, Wedow and others (1954) found monazite and allanite in panned concentrates from upper Slate Creek, just above the mouth of Ben Creek, during a reconnaissance for radioactive deposits. The source of the monazite and allanite presumably is granitic rocks in the drainage. Wedow and others (1954) also found monazite and allanite in concentrate samples from Ruby Creek (EA039) and Ben Creek (EA036).
Geologic map unit (-142.716917457164, 64.6782584918363)
Age of mineralization Probable Mesozoic source for monazite and allanite.

Production and reserves

Workings or exploration In 1949, Wedow and others (1954) found monazite and allanite in panned concentrates from upper Slate Creek, just above the mouth of Ben Creek (see EA036), during a reconnaissance for radioactive deposits.
Indication of production None

References