Unnamed (lode on Indian River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Mo
Ore minerals molybdenite

Geographic location

Quadrangle map, 1:250,000-scale HU
Quadrangle map, 1:63,360-scale A-2
Latitude 66.08
Longitude -153.8144
Nearby scientific data Find additional scientific data near this location
Location and accuracy This lode occurrence is in the placer workings on Indian River. The exact location within the placer workings is not known and the site is located somewhat arbitrarily about a mile down Indian River from the mouth of Black Creek.

Geologic setting

Geologic description

Joesting (1942) reported that a molybdenum deposit had been discovered on the Indian River during placer operations. Although the mineralization was said to be high grade there apparently was no attempt to systematically sample the deposit. There is no information that suggests that any work was done to further explore this occurrence. The only other indication of Mo mineralization in the area was an anomalous Mo value of 25 ppm in a placer sample collected by the Bureau of Land Management in about 1997 (Kurtak and others, 1999). The bedrock under the placer workings is Cretaceous granodiorite and quartz monzonite (Patton and Miller, 1966).
Nokleberg and others (1996) describe, without a specific location, the general Indian Mountain area as a porphyry Cu-Au system. This system, which likely includes all the individual lode occurrences within the area, consists predominately of chalcopyrite- and tourmaline-bearing intrusive breccias. The breccias are surrounded by concentric phyllic-argillic-propylitic alteration halos. A pyrite zone surrounds the intrusive rocks.
Geologic map unit (-153.817032439034, 66.0794629427197)
Mineral deposit model Porphyry Cu-Mo? (Cox and Singer, 1986; model 21a?).
Mineral deposit model number 21a?
Alteration of deposit Highly altered intrusive rocks have been described in the general area but none specifically associated with this occurrence. The type of alteration is not specified.

Production and reserves

Workings or exploration Apparently none.
Indication of production None

References

MRDS Number A015583

References

Bottge, R.G., 1988, Maps summarizing land availability for mineral exploration and development in western Alaska, 1986: U.S. Bureau of Mines Open-File Report 14-88, 38 quadrangle overlays.
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, v. 1 and 2, 845 p.
Reporters J.M. Britton (Anchorage)
Last report date 8/1/2002