Ochre

Prospect in Alaska, United States with commodities Silver, Lead, Zinc, Arsenic, Gold, Mercury, Antimony

Geologic information

Identification information

Deposit ID 10308133
Record type Site
Current site name Ochre

Geographic coordinates

Geographic coordinates: -160.61141, 55.24623 (WGS84)
Relative position The map site of the Ochre prospect is at an elevation of 800 feet, in the NW1/4 of sec. 13, T. 57 S., R. 75 W., Seward Meridian, approximately 2 miles northwest of Baralof Bay on Unga Island. The site is 0.35 mile west-northwest of a 655-foot-high hillock. The location is accurate to within 1,200 feet.
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Geographic areas

Country State
United States Alaska

Commodities

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

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue

Alteration

  • (Local) The host rock is variously argillized, silicified, and pyritized.

Nearby scientific data

(1) -160.61141, 55.24623

Comments on the geologic information

  • Geologic Description = This prospect consists of northeast-striking silicified breccia zones and northwest-striking quartz veins. Chalcopyrite, galena, and sphalerite occur sporadically in the breccia and the veins. The host rock is silicified and argillized pyritic andesite of the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995). The main silicified breccia is 5 to 15 feet in width and strikes N 25 to 65 E. Assays show as much as 18 ppm silver, 450 ppm copper, 3,500 ppm lead, 5,400 ppm zinc, 1,080 ppm arsenic, and 118 ppm mercury (Anderson and others, 1980). Float samples of the northwest-striking vein system assayed as much as 0.51 ppm gold, 72 ppm silver, 3,100 ppm lead, 6,100 ppm zinc, 285 ppm arsenic, 108 ppm mercury, and 6,200 ppm antimony. Battle Mountain Exploration Company sampled the site in 1990. None of the samples taken contained significant gold values.
  • Age = Eocene or younger.

Economic information

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 1980 Resource Associates of Alaska mapped the prospect, collected 504 soil and 152 rock samples, and conducted VLF-EM and magnetometer surveys (Anderson and others, 1980). Float samples of vein quartz contained as much as 0.51 ppm gold and 72 ppm silver and anomalous amounts of copper, lead, zinc, arsenic, mercury, and antimony. Battle Mountain Exploration Company sampled the site in 1990. The samples contained no gold values of note.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF PM060

Bibliographic references

  • 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

    Ellis, W.T., and Apel, R.A., 1990, Unga/Alaska Peninsula 1990 final report, Battle Mountain Exploration Company report, 49 p., 29 map sheets at various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • 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 = Anderson and others, 1980

General comments

Subject category Comment text
Deposit Model Name = Epithermal gold vein
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 04-FEB-01 S.H. Pilcher U.S. Geological Survey