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

Acta Geochimica 2021年第6期40卷 1050-1072页

作者： medet junussov Mádai Ferenc Kristály Ferenc Tòth Tivadar Fintor Krisztián Muránszky Gábor Prekob Ádám Hámor-VidóMária Department of Mineralogy and Petrography Institute of Mineralogy and GeologyFaculty of Earth Sciences and EngineeringUniversity of MiskolcMiskolc-Egyetemváros 3515Hungary Institute of Mineralogy and Geology Faculty of Earth Sciences and EngineeringUniversity of MiskolcMiskolc-Egyetemváros 3515Hungary Department of Mineralogy and Geochemistry Faculty of Science and InformaticsUniversity of SzegedAradi vértank tere 1Szeged 6720Hungary Institute of Chemistry Faculty of Material Sciences and EngineeringUniversity of MiskolcMiskolc-Egyetemváros 3515Hungary Department of Geology and Meteorology Institute of Geography and Earth SciencesFaculty of SciencesUniversity of PécsVasvári pál utcaPecs 7622Hungary

The paper comprises new analytical data on the nature and occurrence of gold in solid pyrobitumen,closely associated with the main gold-bearing sulfide arsenic ores of the Bakyrchik gold deposit(Kazakhstan),related to post-collisional magmatic-hydrothermal *** mineralization of the deposit occurs mainly in the form of an“invisible”type of gold in the structures of arsenian pyrite and arsenopyrite,and the form of gold-organic compounds of pyrobitumen in carbonaceous-terrigenous sequences of Carboniferous *** and electron microscopic analysis,Raman and FT-Infrared analysis,mineralogical and three-step sequential extraction analysis(NH2OHHCl,H2O2,HNO3?HCl)has been carried out using 9 ore samples(from 3 different types of ores)for a comprehensive study of pyrobitumen and sulfide arsenic ores focusing mainly on organic *** sequentially extracted precious metal content of pyrobitumen reaches up to 7 ppm gold and other metals like Ag 4 ppm,Pt 31 ppb,and Pd 26 ppb,forming metal–organic compounds,while arsenic sulfide minerals incorporate 11 ppm gold,39 ppm Ag,0.49 ppm *** enrichment of gold associating with organic matter and sulfide ore minerals was confirmed in this *** matter was active in the migration of gold and the capture of gold by ***,the reductive organic matter agent released gold,most likely for the sulfide arsenic ore *** was a decisive factor in the concentration,transportation,and preservation of gold in the deposit.

关键词： Gold Pyrobitumen Bakyrchik Vitrinite Metal-organic compounds

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A Two-step Sequential Extraction for Analyzing Hardly Accessible Precious Metals in Sulfide Ore-bearing Sedimentary Rocks

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Journal of Geological Resource and Engineering 2019年第1期7卷 32-38页

作者： medet junussov Ferenc Mádai Ferenc Kristály Faculty of Earth Sciences and Engineering Miskolc University H-3515 Miskolc-Egyetemváros Hungary

The work concentrates on extraction of precious metals (Au, Ag, Pd, Pt) and As, Sb, Cu, Pb, Zn, and Fe which are bound to sulfide-ore minerals in sedimentary rocks, using a two-step sequential extraction experiment with two chemical reagents (hydrogen peroxide and aqua regia) on three rock specimens from the black shale formation in Bakyrchik gold-sulfide deposit in North-East Kazakhstan. The experiment allows to determine the speciation of hardly accessible precious metals and to identify the most productive ore-forming stage from the three identified ones. Analytical methods are used for determining polysulfide mineral textures (optical microscopy), mineralogical (XRPD) and chemical compositions (XRF), and for measuring extracted metals concentrations (ICP-OES) in experimental procedures. The analytical results show that the first stage is more productive in gold (total extraction 2.8 ppm) than others and the second stage is more productive in Ag (total 1.6 ppm) and Pd (total 0.01 ppm), while the last stage is more productive in Pt (0.019 ppm) in the deposit.

关键词： Sulfide minerals precious metals hydrogen peroxide aqua regia.

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