Unnamed (west headwaters of Kings River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Ag; Cu
Ore minerals arsenopyrite; chalcopyrite; gold; pyrite; pyrrhotite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale C-5
Latitude 60.5131
Longitude -148.8376
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located in the NW1/4 section 24, T. 5 N., R. 3 E., of the Seward Meridian. It is at an elevation of 2,400 feet, near the toe of an unnamed glacier that is above the west headwaters fork of the Kings River. This is location S-183 of Jansons and others (1984). It is accurate to within a quarter of a mile.

Geologic setting

Geologic description

This occurrence consists of numerous sulfide-bearing quartz-calcite veins in fractured Oligocene felsic dikes that intruded Valdez Group carbonaceous slate and quartzite of Late Cretaceous age (Jansons and others, 1984). The dikes range from 1 to 5 feet thick and generally strike N35E and dip 55 to 80 NW. The dikes contain as much as 15 percent quartz-calcite veins that carry arsenopyrite, chalcopyrite, pyrite, pyrrhotite, and gold. This occurrence was discovered by the U.S. Bureau of Mines in 1980 (Hoekzema and Sherman, 1983). A single grab sample contained 0.75 ppm gold and 3.5 ppm silver along with minor amounts of base metals. Coarse gold occurs in stream sediments downstream from this occurrence.
Geologic map unit (-148.839694685211, 60.5124984912415)
Mineral deposit model Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Oligocene or younger; the veins are in dikes that are Oligocene in age.

Production and reserves

Workings or exploration This occurrence was discovered by the U.S. Bureau of Mines in 1980. A single grab sample contained 0.75 ppm gold and 3.5 ppm silver, along with minor amounts of base metals. Coarse gold occurs in stream sediments downstream from this occurrence.
Indication of production None

References