Unnamed (northwest of Ramsey Bay)

Occurrence, Inactive

Commodities and mineralogy

Main commodities S
Ore minerals pyrite; sulfur
Gangue minerals opal

Geographic location

Quadrangle map, 1:250,000-scale SB
Quadrangle map, 1:63,360-scale D-6
Latitude 55.9
Longitude -159.9
Nearby scientific data Find additional scientific data near this location
Location and accuracy The map site of this approximately located occurrence is at an elevation of about 3,200 feet, at the midpoint of the boundary between secs 10 and 15, T. 49 S., R. 69 W., of the Seward Meridian. (Wilson and others, 1988, locality 10). The location is probably accurate to within 4 miles.

Geologic setting

Geologic description

This occurrence is a sulfur deposit in an area of Quaternary volcanic rocks (Wilson and others, 1995). The sulfur-bearing rock is estimated to be approximately 100 feet thick and to extend approximately 2,500 feet along in the wall of a cirque (Maddren, 1919). Possible extensions are snow-covered. Steaming fumaroles are visible at the west end of the deposit. The outcrop faces south and is visible from Ramsey Bay.
The deposit is not accessible and the following description is based on sulfur-bearing boulders as much as 40 feet in diameter, which occur in the moraine below the deposit. The sulfur occurs in the interstices of volcanic breccia and in vesicles in the breccia fragments. Some of the sulfur forms veins 1/8 to 1/4 inches thick; bulk samples of these veins are estimated to contain as much as 20 percent sulfur (Maddren, 1919). Most of the sulfur is finely disseminated in rock that is estimated to contain 5 to 10 percent sulfur. Fine-grained disseminated pyrite, accompanied by opal, occurs locally. One sample contained 50 percent pyrite and 50 percent opal (Eakins, 1970).
Geologic map unit (-159.90205230029, 55.8991938828189)
Mineral deposit model Fumarolic sulfur
Age of mineralization Quaternary.
Alteration of deposit Argillic?

Production and reserves

Indication of production None

Additional comments

This location is inacessible, and information is based on float samples. It is on land selected by the Aleut Corporation.

References