Unnamed (near Mt. Kachauik) (ARDF #SO146) W

Unnamed (near Mt. Kachauik)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	W
Other commodities	Be
Gangue minerals	calc-silicates; fluorite

Geographic location

Quadrangle map, 1:250,000-scale	SO
Quadrangle map, 1:63,360-scale	D-2
Latitude	64.825
Longitude	-162.904
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is at about 1,250 feet elevation on the southeast side of Peak 1408. It is 4.2 miles northwest of Mt. Kachauik and probably located within 0.25 mile. This is locality 69 of Gamble (1988).

Geologic setting

Geologic description This occurrence is along the north contact of the Kachauik pluton with schistose Ordovician chlorite marble (Till and others, 1986). The plutonic rock at this location is described as a hybrid diorite with abundant biotite (Till and others, 1986). Other parts of the Kachauik pluton to the south are leucocratic, granodiorite to quartz monzonite (Miller and others, 1972). A composite sample of iron-stained intrusive rocks and fluorite-bearing calc-silicate hornfels contained 100 ppm W and 20 ppm Be (Gamble, 1988). The Kachauik pluton is mid-Cretaceous; a K/Ar date for the pluton is 86.1 +/- 3 Ma (Miller and others, 1972).
Geologic map unit	(-162.906599544455, 64.8242815821725)
Mineral deposit model	W skarn (Cox and Singer, 1986; model 14a).
Mineral deposit model number	14a
Age of mineralization	Mid-Cretaceous; a K/Ar date for the Kachauik pluton is 86.1 +/- 3 Ma (Miller and others, 1972).
Alteration of deposit	Calc-silicate minerals are developed in the impure marble country rocks adjacent to the Kachauik pluton. Oxidation of iron-bearing minerals in the intrusive rocks is indicated by iron-oxide staining.

Production and reserves

Workings or exploration	No workings or exploration acitivities are known but regional stream sediment geochemistry and airborne radiometric surveys may have been completed in the area.
Indication of production	None

References

MRDS Number	10308295
References Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000. Miller, T.P., Grybeck, D.J., Elliott, R.L., and Hudson, T.L., 1972, Preliminary geologic map of the southeastern Bendeleben and eastern Solomon quadrangles, eastern Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 72-256, 11 p., 1 sheet, scale 1:250,000. Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.
Reporters	Travis L. Hudson (Applied Geology)
Last report date	8/19/1999