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Chance

Prospect in Alaska, United States with commodities Silver, Gold, Copper, Mercury, Lead
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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 10308688
Record type Site
Current site name Chance

Geographic coordinates

Geographic coordinates: -160.71741, 55.20523 (WGS84)
Relative position The Chance prospect site is located on Unga Island approximately 2,500 feet north of the head of Acheredin Bay (Wilson and others, 1988, locality 31). The map site is near the north end of the boundary between secs. 31 and 32, T. 57 S., R. 75 W., of the Seward Meridian. The location is accurate to within 1,200 feet.

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 A-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
Copper Secondary
Mercury Secondary
Lead Secondary

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Quartz Gangue

Alteration

  • The alteration consists of silicification.

Nearby scientific data

(1) -160.71741, 55.20523
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Chance prospect consists of several quartz veins in an area of silicified and iron-oxide-rich andesite of the the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995). The prospect occurs at the intersection of northeast-and northwest-striking faults. Trenching exposed 32 feet of massive quartz. Channel samples contained as much as 0.94 ppm gold, 1.9 ppm silver, 45 ppm copper, 755 ppm lead, 69 ppm zinc, 280 ppm arsenic, and 0.35 ppm mercury. Grab samples contained as much as 0.95 ppm gold, 26 ppm silver, 975 ppm copper, 9,600 ppm lead, 720 ppm zinc, 260 ppm lead, and 3.5 ppm mercury (Peterson and others, 1982).
  • Age = Eocene or younger.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the workings information

  • Workings / Exploration = UNC Teton Exploration Drilling Company sampled and trenched this prospect in 1982. Grab samples contained as much as 0.95 ppm gold, 1.9 ppm silver, 79 ppm copper, 995 ppm lead, 720 ppm zinc, 260 ppm arsenic, and 1.2 ppm mercury.

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

    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.

Comments on the references

  • Primary Reference = Peterson and others, 1982

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 12-JAN-2001 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.