Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale PM
Quadrangle map, 1:63,360-scale A-2
Latitude 55.18
Longitude -160.593
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 500 feet on southeastern Unga Island approximately 1 mile southeast of Apollo Mountain. The location is accurate to within 1,200 feet.

Geologic setting

Geologic description

The California prospect consists of a system of multiple, 2-inch-wide, open-growth quartz veinlets in bleached, partly argillized felsic tuff containing disseminated iron oxide pseudomorphs of pyrite (Wilson and others, 1988). The hostrocks are part of the Eocene to Oligocene Popof volcanic rocks (Wilson and others, 1995). Battle Mountain Exploration Company (Ellis and Apel, 1990) traced the vein system southwest to the Heather Creek prospect (PM085). A rock sample collected at the California adit contained 2.19 ppm gold. Other samples collected between the California and Heather Creek prospects contained as much as 0.41 ppm gold, 100 ppm or more arsenic, and 1 ppm or more mercury.
Geologic map unit (-160.595054489171, 55.1791670429381)
Mineral deposit model Epithermal gold veins
Age of mineralization Eocene or younger.
Alteration of deposit Alteration types are silicification and argillization.

Production and reserves

Workings or exploration Old workings include a caved north-trending adit and a small dump. In 1983 UNC Teton Exploration Drilling Company mapped the prospect, conducted VLF-EM surveys, collected geochemical samples, and drilled four holes for a total of 2,575 feet (Wilson and others, 1988). In 1990 Battle Mountain Exploration examined and sampled the prospect. One sample collected at the adit contained 2.19 ppm gold.
Indication of production None