Unnamed (near Kilo Hot Spring)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Au; Sn
Other commodities W
Ore minerals cassiterite; gold

Geographic location

Quadrangle map, 1:250,000-scale TN
Quadrangle map, 1:63,360-scale D-3
Latitude 65.8511
Longitude -151.2172
Nearby scientific data Find additional scientific data near this location
Location and accuracy This placer occurrence is about 3 miles downstream from the Kilo Hot Spring on the Kanula Kilolitna River. It is near the center of section 24, T. 12 N., R. 18 W.

Geologic setting

Geologic description

Upstream from this site, the Kanuti Kilolitna River cuts through the Ray Mountains batholith, a Cretaceous, coarse-grained, porphyritic, biotite quartz monzonite pluton. The contact of the quartz monzonite with chlorite-quartz schist and biotite gneiss is exposed near the site.
Panned concentrate samples collected from bars on the river contained flour gold (Kurtak and others, 2002) . One panned concentrate sample assayed 6,976 parts per billion (ppb) gold, 506 parts per million (ppm) tungsten, and 90 ppm tin. Several other samples collected upstream contained 504 to 3,289 ppm tin, 310 ppm tungsten, and small amounts of gold. The source of the tin and gold was not located and none of the rock samples contained anomalous metals.
In addition to the work by the Bureau of Land Management (Kurtak and others, 2002), claims were staked on this site in 1959 and 1960, but no production is documented.
Geologic map unit (-151.219797746449, 65.8506102142259)
Mineral deposit model Tin placer (Cox and Singer, 1986; model 39e).
Mineral deposit model number 39e
Age of mineralization Quaternary.

Production and reserves

Workings or exploration Only a limited amount of work by the Bureau of Land Management in about 2000 to asses the mineral potential of the area.
Indication of production None
Reserve estimates None.
Production notes None.

References

References

Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska: Final Report: U.S. Bureau of Land Management Technical Report 50, 2 vols., 845 p.
Reporters D.J. Grybeck (Contractor, USGS)
Last report date 2/1/2011