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Hog

Prospect in Alaska, United States with commodities Silver, Gold, Arsenic, Copper, Mercury, Lead, Antimony, 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 10308123
Record type Site
Current site name Hog

Geographic coordinates

Geographic coordinates: -160.73042, 55.30623 (WGS84)
Relative position This prospect is located on western Unga Island approximately 1.5 miles west of the head of Zachary Bay (MacKevett and Holloway, 1977, locality 16; Wilson and others, 1988, locality 16). The map site is at an elevation of 1,100 feet, 0.25 mile south-southwest of peak 1965. The location is accurate.

Site location context

Political divisions (FIPS codes)

Aleutians East(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Port Moller B-3(quadrangle 1:63,360 scale)

Unga Island(quadrangle 1:100,000 scale)

Port Moller(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

Unga Corporation(ANCSA Village)

ANCSA Village NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Arsenic Critical Secondary
Copper Secondary
Mercury Secondary
Lead Secondary
Antimony Critical Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Sphalerite Ore
Tetrahedrite Ore
Chalcedony Gangue
Quartz Gangue

Alteration

  • (Local) Alteration locally is zoned outward from silicic to argillic to propylitic. The silicified zones contain quartz veins, amethystine quartz, chalcedony, massive quartz, and pyrite. Argillic minerals include montmorillonite, illite, and a green chloritic clay containing 1 to 10 percent pyrite (Peterson and others, 1982; 1983).

Nearby scientific data

(1) Thi
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This prospect is in volcanic rocks of the late Oligocene to middle Miocene Unga Formation (Wilson and others, 1995). The rocks include volcanic flows, tuffs, ash-flow tuffs, volcaniclastic rocks, and hornblende porphyry. Anomalous gold and silver values have been traced in surface samples for more than 2,300 feet (Peterson and others, 1982; 1983). A northwest-trending mineralized breccia zone appears to have controlled high-grade ore shoots where it intersects northeast-trending structures. The host for the gold-silver mineralization is volcanic breccia. The breccia varies from fractured silica- veined rock to a polymictic breccia, that may in part be intrusive. The highest grade mineralization is associated with the polymictic breccia. The mineralization is accompanied by intense silicification and pyritization. Sparse amounts of arsenopyrite(?), chalcopyrite, galena, sphalerite, and tetrahedrite occur locally. The highest precious metal values were obtained from the discovery outcrop, where samples assayed 4.75 ppm gold and 268 ppm silver (Peterson and others, 1982; 1983). One drill hole intersected 33 feet of breccia containing 1.26 ppm gold and 11.7 ppm silver. This intersect includes 6 feet of breccia containing 2.38 ppm gold and 16.5 ppm silver. Several other holes cut rock having lower grade precious metal values. Surface exposures of other mineralized breccia returned values of as much as 4.69 ppm and 1.47 ppm gold.
  • Age = Oligocene or younger.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the workings information

  • Workings / Exploration = In 1983 Unc Teton Exploration Drilling Company drilled six core holes for a total of 1,350 feet, cut 475 feet of trenches, ran 12,350 feet of VLF-EM surveys, collected more than 400 samples of various types for geochemical analysis, and did 20,000 feet of gridding. The U.S. Geological Survey collected a few samples of this deposit in the mid-1980's. Battle Mountain Exploration Company examined the prospect in 1986.

Reference information

Bibliographic references

  • Deposit

    Peterson, R.J., Lemmers, J., Handverger, P., Gallagher, J., Pilcher, R., East, J., Macleod, T., Bartels. E., 1982, Geology and precious metals potential Unga, Popof, and Korovin Islands, Shumagin Group, Aleutian Chain, Alaska: UNC Teton Exploration Drilling Company report, 127 p., 5 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • Deposit

    Peterson, R.J., Handverger, P., Rosenkrans, D., Bartels, E, and Woolston, D., 1983, Shumagin Islands precious metal exploration program southwest Alaska: UNC Teton Exploration Drilling Company report, 61 p. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • Deposit

    Angeloni, L.M., Wilson, F.H., and Sutlet, S., 1985, Map and tables showing preliminary rock geochemical data, Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-470, 179 p., 1 map sheet, scale 1:250,000.

  • Deposit

    Wilson, F.H., White, W.H., and DuBois, G.D., 1988, Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 88-666, 128 p., scale 1:250,000.

  • Deposit

    Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 map sheet, scale 1:250,000.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Comments on the references

  • Primary Reference = Peterson and others, 1982; 1983

General comments

Subject category Comment text
Deposit Model Name = Epithermal gold veins
Deposit Other Comments = This prospect is on land patented by, or interim-conveyed to, the Aleut Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 04-JAN-01 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.