Native gold in Cu- and Ni-bearing pyroxenite-cortlandite intrusions and placers of the Dambuki ore cluster, the Amur region

V. A. Stepanov, L. I. Rogulina, A. V. Melnikov, D. V. Yusupov

Research output: Contribution to journalArticle

Abstract

The Dambuki ore cluster of the Upper Amur region is characterized by numerous and high-grade gold placers. A few small primary deposits and occurrences of gold-quartz type were formerly considered to be the main source of placers. However, the study of widespread Early Cretaceous Cu- and Ni-bearing ultramafic intrusions has shown that gold occurring in primary Cu-Ni ores and products of their weathering practically does not differ from placer gold in morphology, fineness, or geochemical features. In both cases, elements typical of Cu-Ni ore (Cu, Fe, Pd, Ni, etc.) are detected as impurities of gold particles. These data indicate that the Au-and Pt-bearing Cu-Ni ore mineralization may be the main source of placer gold. This ore mineralization is genetically related to small pyroxenite-cortlandite sills and dikes, abundant in the Dambuki ore cluster. The primary gold-quartz deposits and occurrences also contributed to the placers, but their part was rather small.

Original languageEnglish
Pages (from-to)619-623
Number of pages5
JournalGeology of Ore Deposits
Volume49
Issue number7
DOIs
Publication statusPublished - Dec 2007
Externally publishedYes

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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