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