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Win

Prospect in Alaska, United States with commodities Silver, Niobium (Columbium), Tin, Arsenic, Bismuth, Copper, Iron, Lead, Antimony, Scandium, Tellurium, 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. Mineral occurrence model information
  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 10307803
Record type Site
Current site name Win

Geographic coordinates

Geographic coordinates: -155.88397, 63.20046 (WGS84)
Relative position This prospect is located on a southeast trending spur extending from VABM Side, at an elevation of 1,500 feet (457 m) in Section 31, T. 26 S., R. 16 E., of the Kateel River Meridian. The reporter visited the site in 1984.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Medfra A-6(quadrangle 1:63,360 scale)

Medfra S(quadrangle 1:100,000 scale)

Medfra(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Takotna River(hydrologic unit)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

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

Materials information

Materials Type of material
Arsenopyrite Ore
Bismuthinite Ore
Cassiterite Ore
Chalcopyrite Ore
Sphalerite Ore
Anatase Gangue
Quartz Gangue
Tourmaline Gangue

Alteration

  • (Local) Tourmaline-quartz-sericite in felsic intrusive rocks; quartz-tourmaline-sphene in hornfels.

Mineral occurrence model information

Model code 77
USGS model code 20b
Deposit model name Sn-polymetallic vein

Nearby scientific data

(1) -155.88397, 63.20046
ListMap

Economic information

Comments on the geologic information

  • 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.
  • Ore Material = bismuth-lead sulfosalts
  • Ore Material = silver-tellurium sulfosalts
  • 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.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Innoko

Comments on the reserve resource information

  • Reserves = Despite widespread high grade mineralization, reserves have not been calculated, and there has been no drilling recorded as of 1997.

Comments on the workings information

  • 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).

Reference information

Bibliographic references

  • 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.

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Burleigh, 1992 (BMOFR 92-92)

General comments

Subject category Comment text
Deposit Model Name = Tin polymetallic vein (Cox and singer, 1986; model no. 20b)
Deposit Other Comments = See Won - South (MD024), Won - North (MD021), Cloud (MD059), and Gemini (MD023) prospects.

Reporter information

Type Date Name Affiliation Comment
Reporter 03-JUN-98 Bundtzen, T.K. Pacific Rim Geological Consulting

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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