Morphology and composition of gold in weathering crust of the tom8yaya interfluve

Olga M. Yanchenko, Valery G. Voroshilov, Timofey V. Timkin, Irina V. Martynenko, Mansour Ziaii

Research output: Contribution to journalArticle

Abstract

Relevance. Weathering crusts of rocks of the Paleozoic basement of the Tom8Yaya interfluve are potential targets for commercial ex8 traction of readily recoverable gold. But the morphology and composition of this gold are very poorly studied, which makes it difficult to assess the already identified ore occurrences and determines the relevance of the work performed. The main aim of the research is to investigate chemical composition and morphological features of native gold in weathering crust pro8 file of the Tom8Yaya interfluve. Object: native gold in weathering crusts according to the rocks of the Paleozoic basement of the Tom8Yaya interfluve. Methods. Composition, crystallomorphological features of gold, paragenetic associations with ore and vein minerals were analyzed mic8 roscopically under a binocular, in reflected light, by inductively coupled plasma8atomic emission mass spectrometry (ICP8AES/MS) and on a scanning electron microscope TESCAN VEGA 3 SBU with EMF OXFORD X8Max 50, X8ray fluorescence microscope HORIBA Scienti8 fic XGT87200. Results. Two forms of gold were found in weathering crusts and primary ores - free and bound (invisible) gold. The authors have de8 termined chemical composition and the sample of primary and hypergenic gold are determined. The decrease in the content of impuri8 ty elements and the increase in the strength of hypergenic gold in comparison with the gold of primary mineralization were found. The authors established the main morphological types of gold for different parts of weathering crust section. The presence of hypergene gold of «bacteriomorphic» origin is assumed. All gold varieties are associated with hypergene minerals (carbonates, clay minerals, iron hydroxides). The highest gold content is characteristic for the upper part of the section of the weathering crust - the zone of hydrolysis of residual weathering crust and redeposited weathering crust.

Original languageEnglish
Pages (from-to)84-92
Number of pages9
JournalBulletin of the Tomsk Polytechnic University, Geo Assets Engineering
Volume330
Issue number3
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • Gold
  • Gold chemical composition
  • Tom8Yaya interfluve.
  • Typomorphic features of hypergene gold
  • Weathering crust

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology
  • Waste Management and Disposal
  • Economic Geology
  • Management, Monitoring, Policy and Law

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