Vent

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities As; Hg
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale PM
Quadrangle map, 1:63,360-scale B-2
Latitude 55.31
Longitude -160.45
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located on Popof Island approximately 1 mile north of Red Cove and 0.75 mile west of the lagoon at the head of the cove. The location is accurate to within 1,200 feet.

Geologic setting

Geologic description

At this site two dome-shaped bodies of porphyritic, pyrite-bearing, andesite crop out in an area mapped as Eocene to Oligocene Popof volcanic rocks (Wilson and others, 1995). The domes exhibit sheeted jointing and are accompanied by radiating dikes. Ellis (1988) suggests that they occur on the side of a vent complex. Of 12 rock samples, only one contained gold (0.44 ppm). The sample also contained 202 ppm arsenic, and 0.88 ppm mercury. Most of the samples contained anomalous mercury. A few pan samples contained weakly anomalous gold (0.11 to 0.38 ppm) and mercury (0.195 to 1.35 ppm).
Geologic map unit (-160.452014682046, 55.3091769160058)
Age of mineralization Eocene or younger.

Production and reserves

Workings or exploration In 1988 Battle Mountain Exploration Company examined the occurrence and collected 12 rock and 12 pan samples. Only one sample contained detectable gold (0.44 ppm), as reported by Ellis (1988).
Indication of production None

Additional comments

This site is located on land patented by, or interim-conveyed to, the Aleut Corporation.

References

MRDS Number 10308159

References

Ellis, W.T., 1988, Unga/Alaska Peninsula project, 1988 report: Battle Mountain Exploration Company report, 64 p. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reporters S.H. Pilcher
Last report date 2/5/2000