Unnamed (east of Zachary Bay)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale PM
Quadrangle map, 1:63,360-scale B-2
Latitude 55.37
Longitude -160.56
Nearby scientific data Find additional scientific data near this location
Location and accuracy The map site of this approcimately located occurrence is at an elevation of about 450 feet, about midway between North and West Heads, on Unga Island east of Zachary Bay (Christie, 1974, color anomaly 78?; MacKevett and Holloway, 1977, locality 17; Wilson and others, 1988, locality 17). The location is accurate to within 2 miles.

Geologic setting

Geologic description

This occurrence is in rocks mapped as Popof volcanic rocks of late Eocene to early Oligocene age (Wilson and others, 1995). It is described as an altered zone in Tertiary volcanic rocks by MacKevett and Holloway (1977). The occurrence may correspond to Christie's (1974) color anomaly 78, which he describes as being 3,000 feet in diameter and consisting of pyrite and minor pyrrhotite in fractured volcanic rocks. Gold is herein speculatively listed as a commondity, based on its occurrence elsewhere in the Popov volcanic rocks.
Geologic map unit (-160.562015756805, 55.3691780006858)
Age of mineralization Eocene or younger.
Alteration of deposit Christie (1974) describes the alteration as argillic, but provides no details.

Production and reserves

Workings or exploration Christie (1974) made a brief examination and collected one silt sample. It did not contain anomalous amounts of any commodities.
Indication of production None

Additional comments

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