Sitka

Past Producer in Alaska, United States with commodities Silver, Gold, Copper, Lead, Zinc

Geologic information

Identification information

Deposit ID 10002294
MRDS ID A013200
Record type Site
Current site name Sitka
Alternate or previous names Sitka Gold Mine
Related records 10137047

Geographic coordinates

Geographic coordinates: -160.5563, 55.19312 (WGS84)
Relative position This mine is located on the southeast part of Unga Island approximately 2,500 feet northwest of the head of Delarof Harbor and 1,200 feet northeast of the Apollo mine (Berg and Cobb, 1967, locality 7; Cobb, 1972 [MF 433], locality 5; MacKevett and Holloway, 1977, locality 5; Nokleberg and others, 1987, locality AP4; Wilson and others, 1988, locality 4). The location site is accurate.
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Geographic areas

Country State
United States Alaska

Commodities

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

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Sphalerite Ore
Amethyst Gangue
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) The country rock exhibits pervasive propylitization.

Mineral occurrence model information

Model code 151
USGS model code 25d
Deposit model name Epithermal vein, Sado
Mark3 model number 28
Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite

Nearby scientific data

(1) -160.5563, 55.19312

Comments on the geologic information

  • Geologic Description = The Sitka deposit is a 5- to 10-foot-wide zone of auriferous quartz-sulfide veins in an east-west-striking shear that cuts rocks mapped as andesite of the Eocene to Oligocene Popof volcanic rocks (Wilson and others, 1995). The shear zone dips 65 to 80 degrees to the south. The veins contain pyrite and as much as 5 percent chalcopyrite and galena, along with lesser amounts of sphalerite. They are vuggy and show evidence of open-space filling, resulting in inward-facing euhedral quartz crystals. The sulfides occur mostly at the base of the quartz crystals. The gold, where mined, was free-milling (Atwood, 1911).? the mine was operated in conjunction with the Apollo mine (PM079) until about 1915 (Wilson and others, 1988). Production to that time was estimated at 15,000 tons of unknown grade (Brown, 1947). In the 1980s Alaska Apollo Mines cut six trenches and drilled three core holes for a total of 1,571 feet. The remaining resource is said to be 140,000 tons (Wilson and others, 1996). the average grade is not available.
  • Age = Eocene or younger.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the production information

  • Production Notes = The estimated production is about 15,000 tons of unknown grade.

Comments on the reserve resource information

  • Reserves = the resource is estimated 140,000 tons (reported in Alaska Construction and Oil, v. 25, no. 3, March, 1984, p. 31). The grade is not available.

Comments on the workings information

  • Workings / Exploration = The mine was operated from about 1900 to 1915. Workings at that time consisted in part of a 400-foot shaft, a 360-foot adit, stopes as much as 150 feet long and 15 feet wide on the 55-foot level, and numerous crosscuts (Wilson and others, 1988). In 1983 Alaska-Apollo Gold Mines cut six trenches and drilled three core holes for a total of 1,571 feet.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013200
USGS Alaska Resource Data File ARDF PM076

Bibliographic references

  • Deposit

    Martin, G.C., 1905, Gold deposits of the Shumagin Islands, in Brooks A.H., Mineral resources of Alaska in 1904: U.S. Geological Survey Bulletin 259, p. 100-101.

  • Deposit

    Atwood, W.W., 1909, Mineral resources of southwest Alaska, in Brooks, A.H., and others, Mineral resources of Alaska in 1908: U.S. Geological Survey Bulletin 379, 411 p.

  • Deposit

    Atwood, W.W., 1911, Geology and mineral resources of parts of the Alaska Peninsula: U.S. Geological Survey Bulletin 467, 137 p.

  • Deposit

    Webber, B.S., Moss, J.M., Rutledge, F.A., and Sanford, R.S., 1946, Reconnaissance examinations of parts of the Alaska Peninsula and Aleutian Islands southwestern Alaska: U.S. Bureau of Mines, unpublished report of investigations, 40 p. (Unpublished report held by the U.S. Geological Survey, Anchorage.)

  • Deposit

    Brown, F.R., 1947, Report on the Apollo Consolidated Gold Mining Company, with an analysis by an anonymous reviewer (1935):Territorial Department of Mines Report MR 138-1, 13 p.

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

  • Deposit

    Alaska Construction and Oil, 1984, Alaska mining ? Gold Production could redouble, v. 25, no. 3, p. 31.

  • 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.

  • Deposit

    Wilson, F.H., White, W.H., Detterman, R.L., and Case, J.E., (1991) 1996, Maps showing the resource assessment of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska Peninsula, with a section on Geology of the Pyramid porphyry copper deposit, Alaska Peninsula, Alaska, by W.H. White, J.S. Christie, M.R. Wolfhard, and F.H.Wilson, and a section on Description of the Shumagin epithermal gold vein deposit, by W.H. White and L.D. Queen: U.S. Geological Survey Miscellaneous Field Studies Map MF-2155-F, 46 p., 2 sheets, scales 1:500,000 and 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.

  • Deposit

    Smith, P.S., 1941, Past lode gold production from Alaska: U.S. Geological Survey Bulletin 917-C, p. 159-212.

  • Deposit

    Wedow, Helmuth, Jr., White, M.G., and Moxham, R.M., 1952, Interim report on an appraisal of the uranium possibilities of Alaska: U.S. Geological Survey Open-File Report 52-165, 124 p.

Comments on the references

  • Primary Reference = Wilson and others, 1988

General comments

Subject category Comment text
Deposit Model Name = Sado epithermal gold veins, Polymetallic veins (Cox and Singer, 1986; model 25d; 22c)
Deposit Model Number = 25d; 22c
Deposit Other Comments = the mine is located on private land.

Reporter information

Type Date Name Affiliation Comment
Reporter 31-DEC-2000 S.H. Pilcher U.S. Geological Survey