Unnamed (west of Knutson Lake)

Occurrence in Alaska, United States with commodities Silver, Gold, Lead, Arsenic, Zinc

Geologic information

Identification information

Deposit ID 10308090
Record type Site
Current site name Unnamed (west of Knutson Lake)

Geographic coordinates

Geographic coordinates: -161.24545, 55.62622 (WGS84)
Relative position The map site of this occurrence is at an elevation of 1,600 feet, approximately 1 mile west of Knutson Lake (Wilson and others, 1988, locality 88). The location is accurate to within 2,500 feet.
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Lead Primary
Arsenic Secondary
Zinc Secondary

Materials information

Materials Type of material
Galena Ore
Gold Ore
Travertine Gangue

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) -161.24545, 55.62622

Comments on the geologic information

  • Geologic Description = At this site a travertine deposit approximately 300 feet across and 40 feet thick has formed from seeps in fractures cutting sandstone and shale, either of the the Upper Cretaceous Hoodoo Formation (Trujillo and others, 1982) or the Lower Cretaceous Staniukovich Formation (Wilson and others, 1995). The travertine has a high arsenic content and traces of silver and gold. A pan sample taken from a stream draining the travertine contained visible galena and assayed 2.63 ppm gold, 17.5 ppm silver, and 2,003 ppm lead. Gossan from unmineralized fractures in sandstone slightly uphill from the travertine contained as much as 0.8 ppm gold, 4.3 ppm silver, 295 ppm lead, 366 ppm zinc, and 1.25 percent arsenic (Trujillo and others, 1982).
  • Age = Cretaceous or younger.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the workings information

  • Workings / Exploration = In 1982 Resource Associates of Alaska examined and sampled the site (Trujillo and others, 1982). A pan concentrate sample assayed 2.63 ppm gold, 17.5 ppm silver, and 2,003 ppm lead. Gossan from unmineralized fractures contained as much as 0.8 ppm gold, 4.3 ppm silver, 295 ppm lead, 366 ppm zinc, and 1.25 percent arsenic.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF PM012

Bibliographic references

  • 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

    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 site is located on state land.

Reporter information

Type Date Name Affiliation Comment
Reporter 28-JAN-01 S.H. Pilcher U.S. Geological Survey