Won - South

Site Name

Primary: Won - South
Secondary: Prospect Pit
Secondary: Dog Day
Secondary: Gash
Secondary: Tin Ridge

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Commodity

Primary: Silver
Primary: Tin
Secondary: Antimony
Secondary: Tungsten
Secondary: Arsenic
Secondary: Copper
Secondary: Zinc
Secondary: Lead

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Location

State: Alaska
District: Innoko

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

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

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Physiography

Not available

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Mineral Deposit Model

Model Name: Sn-polymetallic vein

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Sericite-quartz in intermediate dikes.

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Rocks

Not available

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Analytical Data

Not available

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Materials

Ore: Sphalerite
Ore: Chalcopyrite
Ore: Cassiterite
Ore: Arsenopyrite
Ore: Tetrahedrite
Gangue: Tourmaline
Gangue: Quartz
Gangue: Axinite

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Comments

Comment (Reserve-Resource): Reserves = Utilizing Anaconda Minerals exploration data and their own surface sampling, Burleigh (1992, BMOFR 85-92) and Bundtzen and Miller (1997) indicate that the Dog Day-Gash Vein system contains 981,875 tons (890,757 tonnes) of ore grading 1.03 percent tin. The average grade for silver, copper, tungsten and other commodities was not calculated.

Comment (Exploration): Status = Active

Comment (Deposit): Model Name = Tin Polymetallic (Cox and Singer, 1986; model no. 20b)

Comment (Deposit): Other Comments = See Won - North (MD021), Gemini, (MD023), and Win (MD060) prospects.

Comment (Workings): Workings / Exploration = A data release of the U.S. Geological Survey AMRAP study of the Medfra quadangle (King and others, 1980, 1983b; Patton and others, 1980) reported anomalous tin, tungsten, bismuth, lead, silver, and arsenic in stream sediment and pan concentrate samples from creeks draining the project area. In 1983 Duval Corporation and Anaconda Minerals Inc. followed up on these anomalies and discovered the Won-South lode system. In 1984, Anaconda Minerals completed at least two diamond drill holes into the Dog Day and Gash Veins. Drilling encountered up to 6.9 percent tin and 3.3 ounces/ton silver, and anomalous antimony, lead, arsenic, copper, and tungsten over an undisclosed width. Online Exploration Services, Anchorage, Alaska, continued exploration activities in 1997.

Comment (Geology): Age = Late Cretaceous-early Tertiary (inferred) based on age range of plutons in Kuskokwim Mineral belt (Bundtzen and Miller, 1997).

Comment (Reference): Primary Reference = Burleigh, 1992 (BMOFR 85-92)

Comment (Geology): Geologic Description = The Won - South prospect is one of several argentiferous and stanniferous prospects in a small but prominent mountain upland 10 miles (15 km) east of the Cripple Creek Mountains. The Won-South prospect consists of four or more, northwest trending, breccia-vein structures that cut tourmaline-axinite and quartz-altered hornfels (Burleigh, 1992; Bundtzen and Miller, 1997). The veins strike North 45 degrees West, and dip steeply both in northeast and southwest directions. The largest tin-silver bearing vein at the Won-South prospect is the Dog Day and Gash veins, which could be traced for strike lengths of up to 3,500 feet (1,067 m). Tin and silver values occur in brecciated hornfels with cassiterite matrix, cassiterite-sulfide druse on fracture surfaces, in open space crackle breccias, and as disseminated cassiterite in quartz veins (Burleigh, 1992, BMOFR 85-92). Host lithologies are thermally altered (hornfels) of shallow marine-to-nonmarine facies of the Upper Cretaceous Kuskokwim Group. The thermal effects are caused by an underlying plutonic body that is manifested in the prospect area by fine grained, northwest trending intermediate dikes. Although some tin was found in the dikes, all significant mineralization thus far found is in the hornfels. Age of mineralization is inferred to be Late Cretaceous-early Tertiary based on age range of plutons in Kuskokwim Mineral belt (Bundtzen and Miller, 1997). In 1984, Anaconda Minerals Company completed two diamond drill holes into the Dog Day and Gash veins and encountered up to 6.90 percent tin and 3.3 ounces/ton silver and highly anomalous antimony, lead, arsenic, copper, and tungsten over unknown widths.

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References

Reference (Deposit): King, H.D., Risoli, D.A., Cooley, E.F., O'Leary, R.M., Speckman, W.A., Speisman, D.L., and Galland, D.W., 1980, Final results and statistical summary of analyses of geochemical samples from the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811F, 134 pages.

Reference (Deposit): Burleigh, R.E., 1992, Tin mineralization at the Won prospect, west-central Alaska: U.S. Bureau of Mines Open-File Report 85-92, 19 pages.

Reference (Deposit): King, H.D., Tripp, R.B., O'Leary, R.M., and Cooley, E.F., 1983, Distribution and abundance of copper, lead, and zinc in nonmagnetic and moderately magnetic heavy-mineral- concentrate, minus-80-mesh stream-sediment, and ash of aquatic-bryophyte samples, Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-I, 6 sheets, scale 1:250,000.

Reference (Deposit): Patton, W.W., Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-A, 1 sheet, scale l:250,000.

Reference (Deposit): Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Economic Geology Monograph #9, Mineral Deposits of Alaska, p. 242-286.

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