Unnamed Occurrence (ARDF - ID057; southwest of VABM Caribou), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - ID057; southwest of VABM Caribou)	- not defined -
Iditarod Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: 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.
Geology: 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).
Workings: Surface samples were collected by the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Age: Unknown; the granite-porphyry dike at the occurrence has been dated at 52.8 Ma (Miller and Bundtzen, 1994).

Commodities (Major) - Ag, Au, Sb; (Minor) - As, Nb
Development Status: None
Deposit Model: Sn-polymetallic deposit or Polymetallic vein (Cox and Singer, 1986; model 20b o

Other Databases

Link to USGS - Alaska:	ID057

Other Regions, Features and Areas containing this locality

References