Win

Site Name

Primary: Win

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Commodity

Primary: Tin
Primary: Silver
Primary: Niobium (Columbium)
Secondary: Lead
Secondary: Antimony
Secondary: Iron
Secondary: Tellurium
Secondary: Copper
Secondary: Arsenic
Secondary: Bismuth
Secondary: Scandium
Secondary: Zinc

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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: Tourmaline-quartz-sericite in felsic intrusive rocks; quartz-tourmaline-sphene in hornfels.

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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: Bismuthinite
Ore: Arsenopyrite
Gangue: Tourmaline
Gangue: Quartz
Gangue: Anatase

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Comments

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Late Cretaceous (inferred) based on 70.0 Ma age of nearby Cloudy Mt. intrusion (Moll and others, 1981). Specific age of the deposit is unknown.

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

Comment (Workings): Workings / Exploration = Duval Corporation trenched several veins at the Win prospect in the 1970s and early 1980s. Anaconda Minerals followed up with additional trenching and sampling in 1983. Online Exploration Services conducted surface sampling and an airborne geophysical survey of the Win prospect in 1997. An extensive sampling program conducted by the U.S. Bureau of Mines (Burleigh, 1992; BMOFR 92-92) yielded many high grade samples of polymetallic mineralization. One 7.75 foot (2.4 m) channel sample across a breccia vein contained 18.82 ounce/ton silver, and 6.97 percent tin. Additional sampling showed values as high as 94.63 ounce/ton silver, 46.38 percent tin, 926 ppm bismuth, 0.36 percent copper, 1,699 ppm niobium, 5.00 percent antimony, 0.77 percent zinc, and 390 ppm selenium. Niobium positively correlates with high tin values at the Win prospect. Anomalous gold has also been detected (Jim Adler, personal communication, 1998).

Comment (Geology): Ore Material = bismuth-lead sulfosalts

Comment (Reserve-Resource): Reserves = Despite widespread high grade mineralization, reserves have not been calculated, and there has been no drilling recorded as of 1997.

Comment (Deposit): Other Comments = See Won - South (MD024), Won - North (MD021), Cloud (MD059), and Gemini (MD023) prospects.

Comment (Deposit): Model Name = Tin polymetallic vein (Cox and singer, 1986; model no. 20b)

Comment (Geology): Geologic Description = Mineralization at the Win prospect consists of polymetallic-sulfide and quartz-cassiterite mineralized vein and breccia vein systems within a quartz -tourmaline (dravite)-altered hornfels aureole that appears to be related to a small felsic stock and related dikes. Host rocks for the veins and vein breccias are lithic sandstone and siltstone of the Upper Cretaceous Kuskokwim Group (Bundtzen and Miller, 1997); age of mineralization is inferred to be Late Cretaceous based on 70.0 Ma age of nearby Cloudy Mt. intrusion (Moll and others, 1981). The intrusions are cal-alkalic, high Ca, low K, biotite rich, magnetite-bearing, oxidized garnet bearing dacite and granite porphyry (Burleigh, 1992). Mineralization in the hornfels covers a diffuse 1.25 square mile (3.2 square km) area, mainly south of the intrusive center. Mineralized veins and breccia zones exhibit a pronounced N 65 to 75 W trend -- coincident with several regional faults in the immediate area (Patton and others, 1980). Virtually all significant mineralization ocurs in hornfels and not in intrusives. . An extensive sampling program yielded many high grade samples of polymetallic mineralization (Burleigh, 1992, BMOFR 92-92). One 7.75 foot (2.4 m) channel sample across a breccia vein contained 18.82 ounces/ton silver and 6.97 peercent tin. Additional sampling showed values as high as 94.63 ounces/ton silver, 46.38 percent tin, 926 ppm bismuth, 0.36 percent copper, 1,699 ppm niobium, 5.00 percent antimony, 0.77 percent zinc, and 390 ppm selenium. Niobium values have a high correlation coefficient with tin at the Win prospect.

Comment (Geology): Ore Material = silver-tellurium sulfosalts

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References

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): Burleigh, R.E., 1992, Examination of the Win tin prospect, west-central Alaska: U.S. Bureau of Mines Open-File Report 92-92, 23 pages.

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.

Reference (Deposit): Moll, E.J., Silberman, M.L., and Patton, W.W. Jr., 1981, Chemistry, mineralogy, and K-Ar ages of igneous and metamorphic rocks of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811C, 15 p., 2 sheets, scale 1:250,000.

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