Unnamed (on Bench Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals arsenopyrite; gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale C-6
Latitude 60.6571
Longitude -149.2233
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 1,150 feet, in the NE1/4 section 35, T. 7 N., R. 1 E., of the Seward Meridian. It is situated in a canyon on Bench Creek about one mile above its confluence with Groundhog Creek. This is location S-270 of Jansons and others (1984). The location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The occurrence consists of a 2-foot-wide quartz vein that strikes N80W and dips 80N. The host rock is metasandstone of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). The vein contains minor arsenopyrite and numerous metasandstone fragments.
Geologic map unit (-149.225421504825, 60.6565189726688)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the vein cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration The are no reported workings. The occurrence was discovered and sampled by the U.S. Bureau of Mines in 1982. A 24-inch-long chip sample assayed 0.14 ounce of gold per ton and 0.02 ounce of silver per ton (Jansons and others, 1984).
Indication of production None

References

References

Reporters Jeff A. Huber (Anchorage)
Last report date 1/29/2000