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Examination of the Win Tin Prospect, West-Central Alaska.


PB92236207

Publication Date 1992
Personal Author Burleigh, R. E.
Page Count 26
Abstract Mineralization at the Win prospect was investigated by the Bureau of Mines in June, 1990 and 1991 as part of an ongoing investigation of the tin, niobium, and tantalum resource potential in Alaska. The Win prospect is located twenty miles northwest of McGrath, AK. Mineral deposits consist 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 dacite stock and dikes. Host rocks for most of the veins is altered, Late Cretaceous Kuskokwim Group flyschoid rocks. The dacite is a calc-alkalic, high Ca, low K, biotite, magnetite, garnet-bearing coarse-grained intrusive. Mafic and accessory mineral distribution in the stock and dikes is highly erratic. Veins and breccia veins often contain high tin and silver values (up to 18.82 oz/st Ag and 6.97% Sn over 7.75 ft), variable but significant amounts of copper, lead, zinc, arsenic, niobium, antimony, bismuth and tellurium, and trace amounts of gold, indium, and selenium. Mineralization is both distal and proximal to the dacite intrusive rocks, covering a roughly circular area 1.25 mi in diameter. Bedrock exposure of vein systems is limited and no resource is calculated.
Keywords
  • Mineral resources
  • Resource assessment
  • Tin ores
  • Resource potential
  • Mineralogy
  • Niobium ores
  • Tantalum ores
  • Geomorphology
  • Resource distribution
  • Cloudy Mountain
  • Geochemistry
  • Geologic strata
  • Win prospect
  • McGrath(Alaska)
Source Agency
  • Bureau of Mines
NTIS Subject Category
  • 48F - Geology & Geophysics
  • 48A - Mineral Industries
Corporate Authors Bureau of Mines, Anchorage, AK. Alaska Field Operations Center.
Supplemental Notes See also PB92-220623.
Document Type Technical Report
Title Note Open file rept. Jun 90-Jun 92.
NTIS Issue Number 199224
Examination of the Win Tin Prospect, West-Central Alaska.
Examination of the Win Tin Prospect, West-Central Alaska.
PB92236207

  • Mineral resources
  • Resource assessment
  • Tin ores
  • Resource potential
  • Mineralogy
  • Niobium ores
  • Tantalum ores
  • Geomorphology
  • Resource distribution
  • Cloudy Mountain
  • Geochemistry
  • Geologic strata
  • Win prospect
  • McGrath(Alaska)
  • Bureau of Mines
  • 48F - Geology & Geophysics
  • 48A - Mineral Industries
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