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Unnamed (northeast of Canoe Bay)

Prospect in Alaska, United States with commodities Silver, Gold, Arsenic, Copper, Mercury, Lead, 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. Mineral occurrence model information
  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 10308089
Record type Site
Current site name Unnamed (northeast of Canoe Bay)

Geographic coordinates

Geographic coordinates: -161.25244, 55.60122 (WGS84)
Relative position This prospect is located on the Alaska Peninsula approximately 1.5 miles northeast of the shore of Canoe Bay and 2.5 miles southwest of Knutson Lake (Nokleberg and others, 1987, locality AP2; Wilson and others, 1988, locality 49). The map site is at an elevation of 1,100 feet, in the SE1/4 of sec. 8, T. 53 S., R. 78 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 C-4(quadrangle 1:63,360 scale)

Port Moller(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

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
Silver Primary
Gold Primary
Arsenic Critical Secondary
Copper Secondary
Mercury Secondary
Lead Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Gold Ore
Pyrite Ore

Alteration

  • (Local) Freeport Exploration Company (1985) identified phyllic, propylitic, and argillic alteration phases within the intrusive complex. The phyllic phase, thought to be the oldest, consists of moderate to strong sericitization, quartz overgrowths, and disseminated pyrite. Propylitic alteration cross-cuts and overprints the phyllic phase. Argillic alteration is restricted to faults and fractures and cross-cuts the other phases. Trujillo and others (1982) reported the argillic alteration to be widespread, intense, and pervasive.

Mineral occurrence model information

Model code 104
USGS model code 25a
Deposit model name Hot-spring Au-Ag
Mark3 model number 45

Nearby scientific data

(1) -161.25244, 55.60122
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This prospect is localized in a domical intrusive complex of Pliocene or Quaternary age that cuts sedimentary rocks of the Upper Cretaceous Hoodoo Formation (Wilson and others, 1995). The complex contains two rhyolites that are in part intrusive and in part extrusive, a rhyodacite quartz porphyry, several tuff units, and narrow dikes of quartz-sericite-pyrite-feldspar porphyry. Soil samples have defined potentially mineralized areas, but visible gold in rock samples or mineralized quartz veins have not been found. The soils contained as much as 5.2 ppm gold and 8.4 ppm mercury. On the basis of the soil geochemical surveys, Trujillo and others (1982) infer two types of mineralization: a pervasive type occurring in the older rhyolite in areas of argillization and silicification; and an east-west-trending linear type 900 to 3,600 feet in length and cutting several rock types. The older rhyolite also displays a radial pattern of soil anomalies interpreted to be related to tensional cracks that served as conduits for mineralizing fluids. Channel samples of sericitized lithic tuff contained as much as 3.45 ppm gold, 6.5 ppm silver, 258 ppm copper, 23 ppm lead, 675 ppm zinc, 212 ppm arsenic, and 0.941 ppm mercury. Grab samples of the older rhyolite contained as much as 0.90 ppm gold, 0.8 ppm silver, 44 ppm copper, 87 ppm lead, 120 ppm zinc, 231 ppm arsenic, and 0.29 ppm mercury (Trujillo and others, 1982). Freeport Exploration Company in 1984 identified two areas of anomalous soils. One contained 0.5 ppm gold over an area 400 by 1,200 feet. Trenching revealed a fault marked by only minor gold values. A second area of soils contained 0.3 ppm gold in an area 100 by 800 feet (Freeport Exploration Company, 1985). A possible source of some of the gold soil anomalies may be gold-bearing volcanic ash from Mount Dana.
  • Age = Pliocene 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 = Resource Associates of Alaska mapped the prospect, conducted VLF-EM surveys, and collected 1,350 rock and soil samples during the period 1979 to 1983. In 1984 Freeport Exploration Company collected 600 soil and rock samples, dug five backhoe trenches for a total of 700 feet, and hand-dug several hundred feet of trenches. Channel samples of a tuff unit contained as much as 3.45 ppm gold and 6.5 ppm silver. Grab samples of the older rhyolite returned values of as much as 0.90 ppm gold and 0.8 ppm silver. The U.S. Geological Survey collected several samples at this site in the mid-1980s.

Reference information

Bibliographic references

  • Deposit

    Butherus, D.L, Gressitt, E.E., Pray, J., Corner, N.G., Lindberg, P.H., and Fankhauser, R.E., 1979, Exploration and evaluation of the Aleut Native Corporation lands; Volume III: Resource Associates of Alaska, 69 p. 90 sheets, various sacales. (Report held by the Aleut Native Corporation, Anchorage, Alaska.)

  • Deposit

    Anderson, G.L., Butherus, D.L., Fankhauser, R.E., Pray, J.C., Lindberg, P.A., and Hoffman, B.L., 1980, Exploration and evaluation of lands leased from Aleut Native Corporation 1980; Resource Associates of Alaska Report, 84 p, 16 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • Deposit

    Trujillo, R.S., Tapper, C.J., Alvarez, T.J., Porterfield, Ben, and Toupe, W.M., 1982, Exploration and evaluation of precious metal potential of portions of Aleut Corporation lands, southwest Alaska 1982: Unpublished Resource Associates of Alaska report, 91 p, 33 mpas, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • Deposit

    Freeport Exploration Company, 1985, 1984 report of activities, Canoe Bay joint venture: Freeport Exploration Company, 25 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

    Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, D.J., Robinson, M.S., Smith, T.E., and Yeend, W., 1987, Significant metalliferous lode deposits and placer districts of Alaska: U.S. Geological Survey Bulletin 1786, 104 p.

  • 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 = Trujillo and others, 1982

General comments

Subject category Comment text
Deposit Model Name = Hot-spring Au-Ag? (Cox and Singer, 1986; model 25a)
Deposit Other Comments = This prospect is located on land patented by, or interim-conveyed to, the Aleut Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 20-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.