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Wackwitz

Prospect in Alaska, United States with commodities Silver, Lead, Antimony, Gold, 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. Host and associated rocks
  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 10097560
MRDS ID A015398
Record type Site
Current site name Wackwitz
Alternate or previous names Silver King, Little Jim

Geographic coordinates

Geographic coordinates: -147.42684, 65.04857 (WGS84)
Relative position The Wackwitz prospect is located on the divide between Twin Creek and Bedrock Creek, approximately one-quarter mile east of Cleary Summit.

Site location context

Political divisions (FIPS codes)

Fairbanks North Star(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Livengood A-1(quadrangle 1:63,360 scale)

Circle SW(quadrangle 1:100,000 scale)

Livengood(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Lead Primary
Antimony Critical Primary
Gold Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Galena Ore
Sphalerite Ore
Stibnite Ore
Tetrahedrite Ore

Alteration

  • (Local) The mica schist country rock is heavily iron oxide stained for 6 to 7 inches on either side of the sulfide horizon.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist > Mica Schist

Nearby scientific data

(1) -147.42684, 65.04857
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = By 1912, William Jackson had staked the Silver King claim and exposed a flat-lying bed of massive sulfides (Times Publishing Company, 1912). This occurrence contained arsenopyrite, stibnite, galena, pyrite and at least one lead sulfosalt; it was conformable to the surrounding schists (Smith, 1913; B 525). The sulfide bed was one foot thick and was largely oxidized to scorodite and antimony oxides with borders of quartz and sulfide stringers in the surrounding schist (Chapin, 1914). By 1916, the prospect was known as the Silver King or Little Jim prospect and consisted of two open cuts approximately 250 feet apart, both of which hosted a flat-lying sulfide horizon in the metamorphic country rocks (Mertie, 1918). The southeastern open cut exposed 12 inches of massive sulfides, trending east-west and dipping 25 S. A shaft was sunk about 25 feet south of the open cut to intersect the horizon. The other open cut, 250 feet to the northeast exposed a 4-inch-thick sulfide-bearing seam with euhedral quartz crystals in its matrix. This occurrence strikes N 45 E and dips at a low angle to the southeast. The mica schist country rock is heavily stained with iron-oxides for 6 to 7 inches on either side of the sulfide horizon and assays $6 to $7 per ton in gold (0.29 to 0.33 ounces of gold per ton). The sulfide horizons on the Wackwitz prospect contained extremely high silver contents relative to gold (Mertie, 1918).? In the early 1950's, the prospect was known as the 'Polaris' lead-silver prospect when 34 tons of hand-picked lead-silver ore was produced from two open cuts, approximately 1300 feet apart (Saunders, 1954). The mineral deposit was said to strike about N 80 W and dip 20 S. The vein-filling was mostly sulfides, mainly galena and stibnite. The vein had an average thickness of about 8 inches. Smelter returns of sorted ore contained 0.10 to 0.20 ounces of gold per ton, 16.97 to 98.95 ounces of silver per ton and 23.35% to 47.7% lead (Saunders, 1954, p. 5). ? Metz and Robinson (1980) examined the Wackwitz prospect and noted the mineralization consisted of a one-meter-thick massive sulfide horizon in quartz muscovite schist striking N 60 E and dipping flatly to the southeast. Polished sections of the mineralization contained stibnite, jamesonite, galena, sphalerite, arsenopyrite and pyrite which occur in discrete bands. By volume stibnite constitutes 90% of the lens, sphalerite 5%, galena 2% and jamesonite, arsenopyrite and pyrite 1% each.? In 1983, a 100-pound metallurgical sample was collected from a 12-inch thick horizon of massive sulfide on the Wackwitz prospect. This sample assayed 3 to 5 ounces of silver per ton, 0.08 ounces of gold per ton, 5 to 10% arsenic, 1 to 10% antimony and greater than 10% lead (Wu-Ming, 1983). Oxide phases present included senarmontite, scorodite, cervantite and bindhemite, while metallic phase minerals included arsenopyrite, pyrite, jamesonite, boulangerite, tetrahedrite, galena, stibnite and sphalerite. Gold was associated as free inclusions in arsenopyrite; silver was present in tetrahedrite. Crushing and grinding tests indicated precious metals were most abundant in the minus-265-mesh fraction. Thiourea leaching of the Wackwitz ores indicated optimum silver recovery of only 40% on a 24 hour leach. Gold recovery by thiourea leaching was not investigated (Wu-Ming, 1983).

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Fairbanks

Comments on the production information

  • Production Notes = About 34 tons of hand-picked lead-silver ore was produced in 1951 and 1952 (Saunders, 1954, p. 3). Smelter returns indicated gold values from 0.10 to 0.20 ounces of gold per ton, silver from 16.97 to 98.95 ounces of silver per ton and lead from 45.89 to 143.45 ounces of lead per ton (Saunders, 1954, p. 5).

Comments on the workings information

  • Workings / Exploration = By 1916, the prospect was known as the Silver King or Little Jim prospect and consisted of two open cuts approximately 250 feet apart (Mertie, 1918). The prospect was known as the 'Polaris' lead-silver prospect in the early 1950's when 34 tons of hand-picked lead-silver ore was produced from two open cuts, approximately 1300 feet apart (Saunders, 1954).

Reference information

Bibliographic references

  • Deposit

    Times Publishing Company, 1912, Tanana Magazine, Quartz Edition: Fairbanks, Alaska 76 p.

  • Deposit

    Smith, P.S., 1913, Lode mining near Fairbanks, in Prindle, L.M., A geologic reconnaissance of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Bulletin 525, p. 153-216.

  • Deposit

    Smith, P.S., 1913, Lode mining near Fairbanks: U.S. Geological Survey Bulletin 542-F, p. 137-202.

  • Deposit

    Metz, P.A. and Robinson, M.S., 1980, Investigations of mercury-antimony-tungsten metal provinces in Alaska: University of Alaska, Fairbanks, Mineral Industry Research Laboratory, Open-File Report 80-8, p. 153-190.

  • Deposit

    Wu-Ming, Chang, 1983, Influence of washability on distribution of macerals, mineral matter, major oxides and trace elements of certain Alaskan coal: University of Alaska, Fairbanks, M.Sc. thesis, 138 p.

  • Deposit

    Freeman, C.J., 1992, 1991 Golden Summit project final report, volume 2: Historical summary of lode mines and prospects in the Golden Summit project area, Alaska: Avalon Development Corp., 159 p. (Report held by Freegold Recovery Inc. USA, Vancouver, British Columbia.)

  • Deposit

    Mertie, J.B., Jr., 1918, Lode mining in the Fairbanks district, Alaska: U.S. Geological Survey Bulletin 662-H, p. 403-424.

  • Deposit

    Saunders, R.H., 1954, Polaris lead-silver prospect: Alaska Territorial Department of Mines Prospect Evaluation 49-11, 5 p.

  • Deposit

    Chapin, Theodore, 1914, Lode mining near Fairbanks, Alaska: U.S. Geological Survey Bulletin 592-J, p. 321-355.

Comments on the references

  • Primary Reference = Mertie, 1918

General comments

Subject category Comment text
Deposit Model Name = Massive sulfide horizon hosted by quartz muscovite schist.

Reporter information

Type Date Name Affiliation Comment
Reporter 04-MAY-1999 C.J. Freeman Avalon Development Corporation
Reporter 04-MAY-1999 J.R. Guidetti Schaefer Avalon Development Corporation

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

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