Assessment of compositional variation in duplicate samples of pelletized coal

Garry D. Wild, Kenneth W. Kuehn, James C. Hower

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


A single Eastern Kentucky high volatile A bituminous coal was prepared into 24 polished pellets, each of which was point counted at 0.4-mm intervals by a single operator. Examination of the resulting data, both in paired sequences of 500 counts from individual pellets and in randomly extracted 1000-point sets, shows that a certain natural variation exists, converging on a 'most likely absolute difference' for this particular coal. All coals will vary, but it is instructive to consider the precision expected in counting a complex material before considering the reproducibility expected from multiple operators counting the same coal. (C) 2000 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)231-240
Number of pages10
JournalInternational Journal of Coal Geology
Issue number2-3
StatePublished - Jan 2000


  • Maceral analysis
  • Statistical analysis

ASJC Scopus subject areas

  • Fuel Technology
  • Geology
  • Economic Geology
  • Stratigraphy


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