Selenium, tellurium and precious metal mineralogy in Uchalinsk copper-zinc-pyritic district, the Urals

Викентьев, И. В.

doi:10.1088/1757-899x/123/1/012027

Cited by 6 publications

(9 citation statements)

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“…values are 0.5-1.5 g/t Au, 5-50 g/t Ag), but local enrichment occurs (up to 10-90 g/t Au and up to 1000-3000 g/t Ag). The specific feature of Uchaly and Uzelga deposits (Zn-dominated subtype) is the uplifted levels of Au, Ag, Pb, Se, Te, Sb, As, Sn and Cd comparing to most of the other VMS districts of the Urals [71,72]. During 60 years, two hundred million tonnes of ore have been mined from the Gai deposit (Cu-dominated subtype), and ~45% of initial reserves contained about 10 million tonnes of non-ferrous metals (Cu:Pb:Zn = 1:0.03:0.49), 520 t Au and 6300 t Ag (Au/Ag = 0.08).…”

Section: Vms Depositsmentioning

confidence: 99%

“…During processing, most of the total amount of trace elements is not extracted (Au, Ag, Pt, Pd, Pb, Se, Te, Sb, As, Bi, Sn, Co, Ni and Hg), and many of them (Pb, Se, Te, Sb, As, Co, Ni and Hg) become pollutants (together with sulphur dioxide and Fe) [72,83]. The increasing volume of processed VMS ores has aggravated the problem of gold recovery: while copper and zinc are taken in concentrates almost completely (75-85%), integrated gold recovery into the copper and zinc concentrates ranges from 20% (Uchaly) up to 50% (Gai).…”

Section: Vms Depositsmentioning

confidence: 99%

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Noble Metal Speciations in Hydrothermal Sulphides

et al. 2021

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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.

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Section: Vms Depositsmentioning

confidence: 99%

Section: Vms Depositsmentioning

confidence: 99%

Noble Metal Speciations in Hydrothermal Sulphides

et al. 2021

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“…Cu-Zn massive ore at the Uzelga deposit is dominant with following average range of contents: 1-1.5 wt% Cu; 2.5-5 wt% Zn, 0.8-2.5 ppm Au, 15-80 ppm Ag, 20-150 ppm Se; and 30-200 ppm Te [33,100,101].…”

Section: Ore Geochemistry and Mineralogymentioning

confidence: 99%

“…The ore is characterized by a porphyry-like texture, marked by large, up to 5-8 cm, pyrite porphyroblasts enclosed in a fine-grained ground mass of pyrrhotite, minor sphalerite and rarer chalcopyrite (Figure 4). According to instrumental neutron-activation analyses (INAA), pyrite (sample Uz-190-5) is rich in Se (498 ppm), Co (357 ppm) and Te (117 ppm) and has lower contents of As (<1 ppm), Ag (<1 ppm), Sb (<0.3 ppm) and Au (0.2 ppm), comparing to typical pyrite of this deposit [33,101]. 2 and 3).…”

Section: Sample Location and Descriptionmentioning

confidence: 99%

U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes

et al. 2020

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We report on the application of the U-Th-He method for the direct dating of pyrite and provide an original methodological approach for measurement of U, Th and He in single grains without loss of parent nuclides during thermal extraction of He. The U-Th-He age of ten samples of high-crystalline stoichiometric pyrite from unoxidized massive ores of the Uzelga volcanogenic massive sulfide (VMS) deposit, South Urals, is 382 ± 12 Ma (2σ) (U concentrations ~1–5 ppm; 4He ~10−4 cm3 STP g−1). This age is consistent with independent (biostratigraphic) estimations of the age of ore formation (ca, 389–380 Ma) and is remarkably older than the probable age of the regional prehnite-pumpellyite facies metamorphism (~340–345 Ma). Our results indicate that the U-Th-He dating of ~1 mg weight pyrite sample is possible and open new perspectives for the dating of ore deposits. The relative simplicity of U-Th-He dating in comparison with other geochronological methods makes this approach interesting for further application.

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“…It has been shown that gold can be remobilized from the massive sulfide bodies into veins peripheral to, or within the VMS deposits during deformation and metamorphism (Huston et al, 1992;Tourigny et al, 1993;Sinclair et al, 2000;Larocque et al, 1995). Deformation and metamorphism have been proposed to cause coarsening of gold and upgrading in some VMS deposits (Huston et al, 1992;Årebäck et al, 2005;Wagner et al, 2007;Vikentev, 2016;Mercier-Langevin et al, 2011). However, the effect of metamorphism on electrum compositional zoning still remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Dissolution-reprecipitation vs. solid-state diffusion in electrum: Examples from metamorphosed Au-bearing, volcanogenic massive sulfide (VMS) deposits

Liu

Beaudoin

2021

American Mineralogist

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Native Au-Ag alloys (electrum) are the predominant precious metal host in Au-bearing volcanogenic massive sulfide (VMS) deposits. The chemical composition and distribution of electrum records crystal growth and post-crystallization processes. In this study, we present detailed textural and compositional data of electrum from the Ming (Canada) and Boliden (Sweden) Au-bearing VMS deposits. Electron probe micro-analyzer (EPMA) and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analyses of electrum enable characterization of chemical zoning in heterogeneous electrum grains. Electrum from Ming exhibits Ag-rich cores, in gradational contact with an outer Au-rich transition zone also enriched in S, Fe, Cu, Zn, and Pb, which is in sharp contact with Ag-rich rims. The textural observations, coupled with in situ LA-ICP-MS data, highlight that the electrum zoning arises from a complex interaction between fluid facilitated solid-state This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America. The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Selenium, tellurium and precious metal mineralogy in Uchalinsk copper-zinc-pyritic district, the Urals

Cited by 6 publications

References 0 publications

Noble Metal Speciations in Hydrothermal Sulphides

Noble Metal Speciations in Hydrothermal Sulphides

U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes

Dissolution-reprecipitation vs. solid-state diffusion in electrum: Examples from metamorphosed Au-bearing, volcanogenic massive sulfide (VMS) deposits

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