Peak 5309 No. 1

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Cu; Pb
Ore minerals galena; pyrite; pyrrhotite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-7
Latitude 60.339
Longitude -149.567
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located in a small gulch on the east-southeast side of peak 5309 between the elevations of 3,000 and 3,500 feet. It is located in the NE1/4 section 23, T. 3 N., R. 2 W., of the Seward Meridian. This is location S-216 of Jansons and others (1984). This location is accurate to within 500 feet.

Geologic setting

Geologic description

The occurrence is hosted in sheared and strongly deformed sandstone and slate of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). The bedrock strikes N10-20W, and dips are nearly vertical. The mineralization consists of a series of subparallel, quartz-calcite veins as much as 4 feet wide that generally strike N20-60E (Hoekzema and Sherman, 1983). The veins are intermittently banded. They contain euhedral quartz as much as three-quarters of an inch long and calcite crystals. Metallic minerals include galena, pyrite, pyrrhotite, and possible sulfosalt minerals (Hoekzema and Sherman, 1983). In 1982 the U.S. Bureau of Mines collected seven samples that contained less than 0.03 ppm gold and 10 to 250 ppm lead (Hoekzema and Sherman, 1983).
Geologic map unit (-149.569157411092, 60.3384358371647)
Mineral deposit model Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the veins cut rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration In 1982 the U.S. Bureau of Mines sampled collected seven samples that contained less than 0.03 ppm gold and 10 to 250 ppm lead (Hoekzema and Sherman, 1983).
Indication of production None

Additional comments

This occurrence was discovered by the U.S. Bureau of Mines.

References

References

Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 0512/01