Preliminary analysis on roles of metal–organic compounds in the formation of invisible gold

Abstract The paper comprises new analytical data on the nature and occurrence of gold in solid pyrobitumen, closely associated with main gold-bearing sulfide arsenic ores Bakyrchik deposit (Kazakhstan), related to post-collisional magmatic-hydrothermal origin. Gold mineralization occurs mainly form an “invisible” type structures arsenian pyrite arsenopyrite, gold-organic compounds pyrobitumen carbonaceous-terrigenous sequences Carboniferous formation. Microscopic electron microscopic analysis, Raman FT-Infrared mineralogical three-step sequential extraction analysis (NH 2 OH·HCl, H O 2, HNO 3 + HCl) has been carried out using 9 ore samples (from different types ores) for a comprehensive study focusing organic matter. sequentially extracted precious metal content reaches up 7 ppm other metals like Ag 4 ppm, Pt 31 ppb, Pd 26 forming metal–organic compounds, while minerals incorporate 11 gold, 39 Ag, 0.49 Pt. enrichment associating matter was confirmed this study. Organic active migration capture by pyrobitumen. Moreover, reductive agent released most likely minerals. Pyrobitumen decisive factor concentration, transportation, preservation deposit.