Wackwitz

The Wackwitz is a silver, antimony, and lead mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Wackwitz
Secondary: Silver King
Secondary: Little Jim

Commodity

Primary: Silver
Primary: Antimony
Primary: Lead
Secondary: Gold
Secondary: Zinc

Location

State: Alaska
District: Fairbanks

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: The mica schist country rock is heavily iron oxide stained for 6 to 7 inches on either side of the sulfide horizon.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Stibnite
Ore: Tetrahedrite
Ore: Arsenopyrite
Ore: Galena

Comments

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Mertie, 1918

Comment (Deposit): Model Name = Massive sulfide horizon hosted by quartz muscovite schist.

Comment (Workings): 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).

Comment (Production): 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).

Comment (Geology): 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).

References

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

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

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

Reference (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.

Reference (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.)

Reference (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.

Reference (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.

Reference (Deposit): Times Publishing Company, 1912, Tanana Magazine, Quartz Edition: Fairbanks, Alaska 76 p.

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

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