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Tin Occurrences Associated with the Ohio Creek Pluton, Chulitna Region, South-Central Alaska.


PB89148431

Publication Date 1989
Personal Author Warner, J. D.; Dahlin, D.
Page Count 32
Abstract In 1984 and 1985 the Bureau of Mines mapped and sampled reported tin occurrences associated with the Ohio Creek pluton, in the central Alaska Range, south-central Alaska. The pluton is a composite intrusion with a core of moderately coarse-grained biotite granite and an outer zone of finer-grained leucocratic muscovite granite. Tin mineralization, associated with silver, base-metal, and tungsten values, occurs within the muscovite granite as cassiterite (SnO2) within both quartz-muscovite greisen and arsenopyrite veins. Silver occurs within argentiferous galena and argentite (Ag2S); tungsten is present in the Mn-rich wolframite mineral huebnerite (MnWO4). Metallurgical testing of three large samples of tin mineralized greisen showed tin recoveries of 27-64% in table concentrates. A low-grade zone near the pluton's upper contact is inferred to contain a resource of approximately 1,250,000 lb Sn.
Keywords
  • Mineral deposits
  • Tin
  • Alaska
  • Sampling
  • Sites
  • Concentration(Composition)
  • Tables(Data)
  • Geology
  • Granite
  • Ohio Creek pluton
Source Agency
  • Bureau of Mines
NTIS Subject Category
  • 48A - Mineral Industries
  • 48F - Geology & Geophysics
Corporate Authors Bureau of Mines, Fairbanks, AK. Alaska Field Operations Center.
Document Type Technical Report
Title Note Open file rept.,
NTIS Issue Number 198910
Tin Occurrences Associated with the Ohio Creek Pluton, Chulitna Region, South-Central Alaska.
Tin Occurrences Associated with the Ohio Creek Pluton, Chulitna Region, South-Central Alaska.
PB89148431

  • Mineral deposits
  • Tin
  • Alaska
  • Sampling
  • Sites
  • Concentration(Composition)
  • Tables(Data)
  • Geology
  • Granite
  • Ohio Creek pluton
  • Bureau of Mines
  • 48A - Mineral Industries
  • 48F - Geology & Geophysics
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