Unnamed Occurrence (ARDF - SB010; northwest of Ramsey Bay), Aleutians East Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - SB010; northwest of Ramsey Bay)	- not defined -
Aleutians East Borough	Borough
Alaska	State
USA	Country

This location is inacessible, and information is based on float samples. It is on land selected by the Aleut Corporation.
Location: 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.
Geology: 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).
Age: Quaternary.
Alteration: Argillic?

Commodities (Major) - S
Development Status: None
Deposit Model: Fumarolic sulfur

Other Databases

Link to USGS - Alaska:	SB010

Other Regions, Features and Areas containing this locality

References