Kahiltna River

Mine, Probably inactive

Commodities and mineralogy

Main commodities Au
Other commodities Pt; REE; Sn; Th; Ti; U; W; Zr
Ore minerals cassiterite; monazite; native gold; 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 61.89
Longitude -150.69
Nearby scientific data Find additional scientific data near this location
Location and accuracy MacKevett and Holloway (1977, locality 7) locate this placer prospect upstream about three and a half miles from the confluence of the Kahiltna and Yentna Rivers. The prospect area cover an approximate three mile stretch along the Kahlitna River centered at about the middle of the boundary between Sections 23 and 26, T. 22 N., R. 8 W. (U.S. Bureau of Mines , 1973, locality 71). This is a continuation of the placers along the same river described in ARDF TY028 and ARDF TY027.

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 minor 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 (-150.692233773716, 61.889469611194)
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 Probably some minor production prior to 1919. 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

This placer occurrence is the southern most mine along the Kahiltna River; two other localities, know as Kahiltna River, are upstream in the Tyonek Quadrangle. Placer occurrences extend to the north along the Kahiltna River in the Talkeetna Quadrangle.

References

MRDS Number M045414

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