Unnamed (northeast of head of Getmuna Creek) (ARDF #SM005) Ce, Hg, Nb, Zn

Unnamed (northeast of head of Getmuna Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Ce; Hg; Nb; Zn
Other commodities	Au; Cr; Cu
Ore minerals	unspecified sulfide minerals

Geographic location

Quadrangle map, 1:250,000-scale	SM
Quadrangle map, 1:63,360-scale	D-7
Latitude	61.78559
Longitude	-158.47408
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is near the top of hill 3405 in the northeast corner of the Horn Mountains. It is in the NW1/4 sec. 35, T. 20N., R. 51 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description This occurrence consists of a strong ferricrete gossan, probably formed by the weathering of sulfides, along several high angle fault zones about 4 inches thick. The occurrence is in a dacite-andesite flow of the Horn Mountains volcanic field (Bundtzen and others, 1998). One grab sample gossan with a disseminated gray sulfide mineral contained 24 parts per billion (ppb) gold, 77 parts per million (ppm) copper, 260 ppm zinc, more than 10.00 percent iron, 310 ppm chromium, 320 ppm cerium, 48 ppm niobium, and 9.23 ppm mercury (Bundtzen and others, 1998).
Geologic map unit	(-158.476461842401, 61.7848860347346)
Mineral deposit model	Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number	22c
Age of mineralization	Undated; may be related to the nearby Horn Mountain pluton which has been dated at 68-69 Ma (Bundtzen and others, 1998).
Alteration of deposit	Strong gossan development.

Production and reserves

Workings or exploration	Surface sampling was conducted in 1990 by Ellie Harris of the Alaska Division of Geological and Geophysical Surveys (Bundtzen and others, 1998).
Indication of production	None

References

References Bundtzen, T.K., Harris, E.E., Miller, M.L., Layer, P.W., and Laird, G.M., 1998, Geology of the Sleetmute C-7, C-8, D-7, and D-8 quadrangles, Horn Mountains, southwestern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 98-12, 38 p., one sheet, scale 1:63,360. Cady, W.M., Wallace, R.E., Hoare, J.M., and Webber, E.J., 1955, The central Kuskokwim region, Alaska: U.S. Geological Survey Professional Paper 268, 132 p.
Reporters	T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.) and M.L. Miller (U.S. Geological Survey)
Last report date	5/6/2003