Unnamed (head of Caribou Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Bi; Sn
Other commodities As; Au; Cu
Ore minerals iron oxide

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale C-4
Latitude 62.52836
Longitude -157.86091
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a small but prominent knob, hill 877, on an unnamed fork of Caribou Creek. The occurrences is at an elevation of about 700 feet, about 0.5 mile west to west-southwest of the center of section 8, T. 28 N., R. 46 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence consists of altered, iron-oxide-stained hornfels near a biotite-bearing, fine grained intrusion. The intrusion has been radiometrically dated as 70.2 Ma (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The mineralized body is of uncertain size and orientation. One grab sample of mineralization rock contained 2,000 parts per billion (ppb) silver, 850 parts per million (ppm) arsenic, 200 ppm copper, 52 ppm bismuth, 30 ppm tin, and 50 ppb gold (McGimsey and others, 1988).
Geologic map unit (-157.863307451315, 62.5276780437567)
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 Undated; the nearby intrusion is 70.2 Ma (Miller and Bundtzen, 1994).
Alteration of deposit Iron oxide staining.

Production and reserves

Workings or exploration The area was sampled by the Alaska Division of Geological and Geophysical Surveys and U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Indication of production None