Unnamed (northwest of VABM Kluklaklatna)

Occurrence, Probably inactive

Commodities and mineralogy

Main commodities Cu; W
Other commodities Au
Ore minerals pyrrhotite; scheelite
Gangue minerals quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale NL
Quadrangle map, 1:63,360-scale A-4
Latitude 64.2
Longitude -158
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located approximately 2 miles west-northwest of VABM Kluklaklatna (spelled Kluklakatna on Nulato 1:250,000-scale quadrangle map), in the southern Kaiyuh Mountains. It is in the NW1/4 sec. 36, T. 14 S., R. 4 E., Kateel River Meridian. The location is accurate within 5 miles.

Geologic setting

Geologic description

This float occurrence consists of limonitic quartz and tourmaline veins in schist, enclosed in pyrrhotite-andalusite hornfels near the Khotol Pluton. The veins(?) also contain sparse, large euhedral crystals of scheelite. Nine rock samples contained up to 238 ppm copper, 45 ppb gold, and 315 ppm tungsten (Flanigan, 1998). Flanigan interprets this gossan to be related to magmatic fluids from the Khotol pluton, based on its proximity to the Khotol pluton and to its low molybdenum content. The Khotol pluton has been dated at approximately 110 Ma by K/Ar and Ar/Ar methods (Flanigan, 1998).
Also see NL012, NL014-016, and NL019-022.
Geologic map unit (-158.002451476914, 64.1993427160635)
Mineral deposit model Plutonic-related Cu-Au-W
Age of mineralization Flanigan (1998) interprets this gossan to be related to magmatic fluids from the Khotol pluton, based on its proximity to the Khotol pluton and to its low molybdenum content. The Khotol pluton has been dated at approximately 110 Ma by K/Ar and Ar/Ar methods (Flanigan, 1998).
Alteration of deposit Quartz-tourmaline veins occur in hornfelsed schist near the Khotol Pluton.

Production and reserves

Workings or exploration This occurrence was discovered by Anaconda Minerals Company in 1980 (Flanigan, 1998).
Indication of production None

References

MRDS Number 10307893

References

Flanigan, B., 1998, Genesis and mineralization of ore deposits in the Illinois Creek region, west central Alaska: University of Alaska, Fairbanks, M.Sc. thesis, 125 p., 2 plates.
Reporters C.E. Cameron (Northern Associates Inc.)
Last report date 8/7/2001