Unnamed (north bank of Bonanza Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Sb
Other commodities Ag; As; Au; Pb
Ore minerals stibnite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale B-4
Latitude 62.35641
Longitude -157.82719
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is exposed on a small bluff on the north side of Bonanza Creek, about 2.0 miles northeast of the mouth of First Chance Creek. It is about 0.3 mil west-southwest of the center of section 9, T. 26 N., R. 46 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This prospect is a stibnite-quartz vein up to 3 feet thick near a granite porphyry dike or sill that is similar to the sill at the occurrences about a half mile to the northeast (ID124) (Bundtzen and others, 1992; Miller, Bundtzen, and Gray, 2005). The rocks in the area are shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994). The orientation of the vein is uncertain. Masses of stibnite up to 1 inch thick were noted in the quartz gangue of the vein but no other sulfides were identified. Grab samples contained more than 1.00 percent antimony, 1.0 part per million (ppm) silver, 300 ppm lead, 120 ppm arsenic, and a trace of gold (McGimsey and others, 1988).
Geologic map unit (-157.82959276574, 62.3557229915827)
Mineral deposit model Simple Sb vein (Cox and Singer, 1986; model 27d).
Mineral deposit model number 27d
Alteration of deposit Silicification.

Production and reserves

Workings or exploration Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Indication of production None

References

References

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 5/24/2003