Kahiltna River

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Pt; REE; Sn; Th; Ti; U; W; Zr
Ore minerals cassiterite; gold; monazite; platinum; rutile; scheelite; uranothorianite
Gangue minerals garnet; hematite; ilmenite; magnetite; quartz; sphene; tourmaline; zircon

Geographic location

Quadrangle map, 1:250,000-scale TY
Quadrangle map, 1:63,360-scale D-2
Latitude 61.99
Longitude -150.75
Nearby scientific data Find additional scientific data near this location
Location and accuracy Carnes (1976, locality 4) defines this placer prospect as covering approximately a four and one-half mile stretch along the Kahiltna River centered at about the middle of the boundary between Sections 21 and 16 in T. 22., R. 18 W. (Cobb, 1972, MF 385, locality 7 and U.S. Bureau of Mines 1973, localities 22, 39, and 59). This site is on upstream extention of the placer site along the same river described in ARDF TY028.

Geologic setting

Geologic description

Quaternary gravels reconcentrated from Tertiary continental rock, glacial deposits or older bedrock to the north in the Talkeetna quadrangle. Samples are reported to contain up to 0.08% uranium and 0.03% thorium (Cobb,1979, OFR 80-86. p. 17). Probably some small production prior to 1919. Drilling for possible dredging was done in the early 1900s. Limited prospecting may have been done more recently.
Geologic map unit (-150.752234787579, 61.9894718815212)
Mineral deposit model Placer gold (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a
Age of mineralization Quaternary

Production and reserves

Workings or exploration Drilling for possible dredging was done in the early 1900s. Limited prospecting may have been done more recently.
Indication of production Yes; small

Additional comments

See other Kahiltna River occurrences in the Tyonek Quadrangle (ARDF numbers TY028 and TY029) and to the north in the Talkeetna Quadrangle.

References

MRDS Number A011829

References

U.S. Bureau of Mines, 1973, Alaska 1:250,000-scale quadrangle map overlays showing mineral deposit locations, principal minerals, and number and type of claims: U.S. Bureau of Mines Open-File Report 20-73, 95 overlays (updated in 1986, 1987).
Reporters Madelyn A. Millholland (Anchorage), James Riehle (USGS)
Last report date 6/1/1998