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Unnamed (near southeast shoreline of Cemetery Cove)

Occurrence in Alaska, United States with commodities Copper, Molybdenum, Silver, Gold, Zinc
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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. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10308464
Record type Site
Current site name Unnamed (near southeast shoreline of Cemetery Cove)

Geographic coordinates

Geographic coordinates: -168.40237, 53.29907 (WGS84)
Relative position This site is located on the west coast of Umnak Island along the southeast shore of Cemetery Cove (Christie, 1974, anomaly 34). The location is accurate to within 1 1/2 miles.

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Umnak B-2 SE(quadrangle 1:24,000 scale)

Umnak Island(quadrangle 1:100,000 scale)

Umnak(quadrangle 1:250,000 scale)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Molybdenum Primary
Silver Secondary
Gold Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Gold Ore
Molybdenite Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) The alteration consists of propylitization, along with localized silicification and pyritization.

Nearby scientific data

(1) -168.40237, 53.29907
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = At this site a color anomaly, measuring approximately 11,000 by 1000 feet, is present along the shore and represents the weathering of a very well-developed quartz stockwork in a dacitic or rhyolitic flow (Christie, 1974). These rocks have been mapped as Tertiary to Quaternary in age (Byers, 1959). The stockwork consists of thin, generally barren, vuggy quartz veinlets in highly pyritized and silicified wall rock. The veinlets are continuous but appear to be randomly oriented. The stockwork itself contains 0 to10 percent pyrite and a trace of chalcopyrite. Metal values in 20 samples of quartz veins and pyritized wall rock contained up to 150 ppm copper, 21 ppm molybdenum, .03 ppm gold, 1.6 ppm silver, and 68 ppm zinc (Christie 1974). Forty-four samples collected at a later date contained up to 1130 ppm arsenic, 491 ppb gold, 2.8 ppm silver, 260 ppb mercury, and 94 ppm molybdenum (Randolph and Ellis, 1989).
  • Age = Tertiary.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Aleutian Islands

Comments on the workings information

  • Workings / Exploration = Brief reconnaissance mapping and fairly extensive rock-chip sampling were done by the Aleut-Quintana-Duval JV in 1974. Twenty rock chip samples yielded up to 150 ppm copper, 21 ppm molybdenum, 150 ppm copper, 0.03 ppm gold, 1.6 ppm silver and 68 ppm zinc. Most higher gold values came from samples of quartz veinlets (Christie, 1974). Forty-four samples collected at a later date contained up to 1130 ppm arsenic, 491 ppb gold, 260 ppb mercury, 94 ppm molybdenum, and 2.8 ppm silver (Randolph and Ellis, 1989).

Reference information

Bibliographic references

  • Deposit

    Byers, F.M, 1959, Geology of Umnak and Bogoslof Islands, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-L, p. 267-369, 3 map sheets, scale 1:63,360, 1:96,000, 1:300,000.

  • Deposit

    Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • Deposit

    Randolph, D.B., and Ellis, W.T., 1989, Unalaska project, 1989 final report: Battle Mountain Exploration Company, Alaska District, 41 p., 5 appendices, 11 plates, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

Comments on the references

  • Primary Reference = Christie, 1974

General comments

Subject category Comment text
Deposit Model Name = Quartz stockwork with minor copper, molybdenum, zinc, and precious metal values.
Deposit Other Comments = This site is located on lands selected by the the Aleut Native Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 27-JAN-00 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.