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  3. Mineral Resource Data System (MRDS)

Unnamed (northwest of Ramsey Bay)

Occurrence in Alaska, United States with commodity Sulfur
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10002316
MRDS ID A013229
Record type Site
Current site name Unnamed (northwest of Ramsey Bay)

Geographic coordinates

Geographic coordinates: -159.90245, 55.89925 (WGS84)
Relative position 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.

Site location context

Political divisions (FIPS codes)

Aleutians East(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Stepovak Bay D-6(quadrangle 1:63,360 scale)

Stepovak Bay(quadrangle 1:100,000 scale)

Stepovak Bay(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Cold Bay(hydrologic unit)

Aleutian Islands(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Alaska Peninsula National Wildlife Refuge(National Wildlife Refuge)

National Wildlife Refuge FWS(Type of land area)

FWS(Federal land areas administered by FWS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Sulfur Primary

Materials information

Materials Type of material
Pyrite Ore
Sulfur Ore
Opal Gangue

Alteration

  • (Local) Argillic?

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic)
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic)

Nearby scientific data

(1) -159.90245, 55.89925
ListMap

Economic information

Comments on the geologic information

  • 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).
  • Age = Quaternary.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Non-metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Eakins, 1970

General comments

Subject category Comment text
Deposit Model Name = Fumarolic sulfur
Deposit Other Comments = This location is inacessible, and information is based on float samples. It is on land selected by the Aleut Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 04-NOV-2000 S.H. Pilcher U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.