Unnamed (south flank of Takotna Mountain) (ARDF #ID046) Ag

Unnamed (south flank of Takotna Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Ag
Other commodities	Au; Cu; Zn
Ore minerals	iron oxide
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	ID
Quadrangle map, 1:63,360-scale	D-1
Latitude	62.9235
Longitude	-156.0081
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is on the steep south flank of Takotna Mountain about 0.4 mile south of the summit along the access road to the radar site at the top of the mountain. The occurrence is at an elevation of about 2,100 feet in the NE1/4, section 25, T. 33 N., R. 36 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description This occurrence is an iron-oxide-stained quartz-cemented breccia in hornfels at the edge of the Takotna pluton. The pluton has been dated as 71.0 Ma (Bundtzen and Laird, 1983; Miller and Bundtzen, 1994). The mineralized quartz-breccia zone was estimated to be at least 6 feet thick. One sample contained 13.7 parts per million (ppm) silver, 280 ppm copper, 1,030 ppm zinc, and 30 parts per billion (ppb) gold (Bundtzen and Laird, 1983; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005).
Geologic map unit	(-156.010459690581, 62.9228703460269)
Mineral deposit model	Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number	22c
Age of mineralization	Probably related to the Takotna pluton that has been dated at 71.0 Ma (Bundtzen and Laird, 1983; Miller and Bundtzen, 1994).

Production and reserves

Workings or exploration	Surface samples were collected in 1977 by the Alaska Division of Geological and Geophysical Surveys (Bundtzen and Laird, 1983).
Indication of production	None

References

References Bundtzen, T.K., and Laird, G.M., 1983, Geologic map of the Iditarod D-1 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 78, scale 1:63,360. Miller, M.L., and Bundtzen, T.K., 1994, Generalized geologic map of the Iditarod quadrangle, Alaska showing potassium-argon, major oxide, trace element, fossil, paleocurrent, and archeological sample localities: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-A, 48 pages; 1 sheet, scale 1:250,000. Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet.
Reporters	T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)
Last report date	5/16/2003