Karshner Creek, Karshner Creek Showing

Showing with commodities rare earth elements, titanium, zirconium

More information at and near this site: REE-AK00120

About this location

Feature ID REE-Mo00613
Other names Hot Springs Slough
Geographic coordinates -150.631341, 65.002526
Point definition Site corresponds with pan sample in Waters (1934); location is from Cobb (1972a)
Reference Waters (1934); Number 37 (1)
Date: 1934; Scale: Small (<1:250,000)
Remarks (1) Cobb (1972); Noted as about 100 yards away from the Hot Springs Slough in Waters (1934)

Geologic information

Commodities rare earth elements; titanium; zirconium
Valuable materials magnetite; monazite; zircon; brookite
Associated materials muscovite; andalusite; orthoclase; quartz; biotite; apatite; tourmaline
Mineralization style grains
Host rock age Cretaceous
Reference Waters, A.E., 1934, Placer concentrates of the Rampart and Hot Springs district: U.S. Geological Survey Bulletin 844-D, p. 163-246.

Descriptions from sources

Geology

The sand is composed dominantly of minerals derived from the disintegration of the granite, but the presence of andalusite and well-rounded crystals of pink zircon suggests that patches, at least, of the intruded Cretaceous sediments are included in the drainage basin of this stream. Although tourmaline was second in abundance among the heavy" minerals, no cassiterite was found. The presence of brookite and monazite is of interest, as this is the only place in this region, outside of the vicinity of the tin placers, where these two minerals were found.

Waters, A.E., 1934, Placer concentrates of the Rampart and Hot Springs district: U.S. Geological Survey Bulletin 844-D, p. 163-246.

Deposit models and geoenvironmental models

Type Model Reference
Deposit model monazite-bearing stream placers Waters, A.E., 1934, Placer concentrates of the Rampart and Hot Springs district: U.S. Geological Survey Bulletin 844-D, p. 163-246.
Geoenvironmental model unclassified

Geographic context based on the point coordinates