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Noble Metal Speciations in Hydrothermal Sulphides

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, 119017 Moscow, Russia
Department of Geology, Mining and Oil&Gas Engineering, Academy of Engineering, Peoples’ Friendship University of Russia (RUDN University), 117198 Moscow, Russia
Scientific Geoinformation Centre, Russian Academy of Sciences, 119019 Moscow, Russia
Institute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements, 121357 Moscow, Russia
Department of Geology, Lomonosov Moscow State University, 119992 Moscow, Russia
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
Department of Geology and Geophysics, Novosibirsk State University, 630090 Novosibirsk, Russia
Author to whom correspondence should be addressed.
Academic Editor: Liqiang Yang
Received: 28 February 2021 / Revised: 27 April 2021 / Accepted: 28 April 2021 / Published: 3 May 2021
A significant part of the primary gold reserves in the world is contained in sulphide ores, many types of which are refractory in gold processing. The deposits of refractory sulphide ores will be the main potential source of gold production in the future. The refractory gold and silver in sulphide ores can be associated with micro- and nano-sized inclusions of Au and Ag minerals as well as isomorphous, adsorbed and other species of noble metals (NM) not thoroughly investigated. For gold and gold-bearing deposits of the Urals, distribution and forms of NM were studied in base metal sulphides by laser ablation-inductively coupled plasma mass spectrometry and by neutron activation analysis. Composition of arsenopyrite and As-pyrite, proper Au and Ag minerals were identified using electron probe microanalysis. The ratio of various forms of invisible gold—which includes nanoparticles and chemically bound gold—in sulphides is discussed. Observations were also performed on about 120 synthetic crystals of NM-doped sphalerite and greenockite. In VMS ores with increasing metamorphism, CAu and CAg in the major sulphides (sphalerite, chalcopyrite, pyrite) generally decrease. A portion of invisible gold also decreases —from ~65–85% to ~35–60% of the total Au. As a result of recrystallisation of ores, the invisible gold is enlarged and passes into the visible state as native gold, Au-Ag tellurides and sulphides. In the gold deposits of the Urals, the portion of invisible gold is usually <30% of the bulk Au. View Full-Text
Keywords: invisible gold; sulphides; LA-ICPMS; synthesis; gold deposits; VMS deposits; Urals invisible gold; sulphides; LA-ICPMS; synthesis; gold deposits; VMS deposits; Urals
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MDPI and ACS Style

Vikentyev, I.; Vikent’eva, O.; Tyukova, E.; Nikolsky, M.; Ivanova, J.; Sidorova, N.; Tonkacheev, D.; Abramova, V.; Blokov, V.; Spirina, A.; Borisova, D.; Palyanova, G. Noble Metal Speciations in Hydrothermal Sulphides. Minerals 2021, 11, 488.

AMA Style

Vikentyev I, Vikent’eva O, Tyukova E, Nikolsky M, Ivanova J, Sidorova N, Tonkacheev D, Abramova V, Blokov V, Spirina A, Borisova D, Palyanova G. Noble Metal Speciations in Hydrothermal Sulphides. Minerals. 2021; 11(5):488.

Chicago/Turabian Style

Vikentyev, Ilya, Olga Vikent’eva, Eugenia Tyukova, Maximilian Nikolsky, Julia Ivanova, Nina Sidorova, Dmitry Tonkacheev, Vera Abramova, Vyacheslav Blokov, Adelina Spirina, Diana Borisova, and Galina Palyanova. 2021. "Noble Metal Speciations in Hydrothermal Sulphides" Minerals 11, no. 5: 488.

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