Unnamed (southwest of VABM Caribou) (ARDF #ID057) Ag, Au, Sb

Unnamed (southwest of VABM Caribou)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Ag; Au; Sb
Other commodities	As; Nb
Ore minerals	unspecified sulfides
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	ID
Quadrangle map, 1:63,360-scale	C-4
Latitude	62.51596
Longitude	-157.82428
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is near the crest of an east-west trending ridge between the Otter and Caribou Creeks. It is about 1.5 mile southwest of triangulation station Caribou at an elevation of about 1,950 feet, and about 0.3 mile west of the center of section 16, T. 28 N., R. 46 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description This occurrence consists of iron-oxide-stained quartz veinlets in sandstone and in quartz-healed sandstone breccia of the Upper Cretaceous, Kuskokwim Group, that is cut by a granite-porphyry dike (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Sulfides are present but were not identified. The size and orientation of the mineralized zone is uncertain. Grab samples contained up to 1,200 parts per billion (ppb) silver, 200 ppb gold, 290 parts per million (ppm) antimony, 130 ppm arsenic, and 50 ppm niobium (McGimsey and others, 1988).
Geologic map unit	(-157.826676537897, 62.5152773629566)
Mineral deposit model	Sn-polymetallic deposit or Polymetallic vein (Cox and Singer, 1986; model 20b or 22c).
Mineral deposit model number	20b or 22c
Age of mineralization	Unknown; the granite-porphyry dike at the occurrence has been dated at 52.8 Ma (Miller and Bundtzen, 1994).

Production and reserves

Workings or exploration	Surface samples were collected by the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Indication of production	None

References

References McGimsey, R.G., Miller, M.L., and Arbogast, B.F., 1988, Paper version of analytical results, and sample locality map for rock samples from the Iditarod quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-421-A, 110 p., 1 sheet, scale 1:250,000. 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	5/19/2003