Distribution of Gold and Associated Ore-Bearing Elements in Gold-Copper-Pyrite Ores of the Kyzylbulag Deposit (Lesser Caucasus, Azerbaijan)

2020 ◽  
pp. 51-59
Author(s):  
M.I. Mansurov ◽  
B.H. Galandarov ◽  
U.I. Karimli ◽  
A.I. Huseynov
Keyword(s):  
Cluster Analysis ◽  
Elemental Composition ◽  
Native Gold ◽  
Ore Body ◽  
Hydrothermal Stage ◽  
Copper Pyrite ◽  
Lesser Caucasus ◽  
Pyrite Ores ◽  
Host Rocks ◽  
Ore Deposition

The article presents the results of studies of the distribution of gold and associated ore elements in gold-copper pyrite ores of the Kyzylbulag deposit. It was established that the elemental composition of ores and host rocks of the deposit includes Cu, Pb, Au, Ag, Ni, As, Sb, Bi, and Mo, of which Au, Cu, Ag, and Zn are the more stable. The behavior of elements was also studied for the entire ore body, as a result of which they are divided by cluster analysis at R (5 %) - 0.1 into two groups: 1) Au, Cu and Ag; 2) Pb and Zn. The closest relationship in the first group was found between Au and Cu, Au and Ag, Ag and Cu; and in the second, between Pb and Zn. Acquired results confirm that gold and the copper are the major components of ore in the field expressed generally in the mineral paragenesis of chalcopyrite - native gold shown in the independent hydrothermal stage of ore deposition.

STALE TAILINGS OF COPPER-CRUSTED ORES FLOTATION WITH THE POSSIBILITY OF GOLD AND SILVER SELECTIVE EXTRACTION: RESOURCE POTENTIAL ANALYSIS

2021 ◽  
Vol 27 (6) ◽  
pp. 31-39
Author(s):  
N. Medyanik ◽  
◽  
E. Leontieva ◽  
O. Mishurina ◽  
E. Mullina ◽  
...  
Keyword(s):  
Elemental Composition ◽  
Phase Analysis ◽  
Mineral Composition ◽  
Selective Extraction ◽  
Material Composition ◽  
Raw Material ◽  
Resource Potential ◽  
Flotation Tailings ◽  
Copper Pyrite ◽  
Pyrite Ores

The article analyzes the possibility and efficiency of processing stale tailings of flotation plants of the copper pyrite complex. The resource potential, material composition and technological capabilities of processing a number of technogenic objects are considered. The interrelation and influence of mineralogical and technological factors on the choice of tailings processing technology are analyzed. The results of chemical, mineral and phase analysis of stale flotation tailings of the studied pyrite ores are presented. According to the complex studies’ results, it is established that the stale flotation tailings of copper pyrite ores belong to a refractory type of geo-resources due to the high content of pyrite and low, at the level of ppm, gold and silver content, which are present mainly in the “resistant” minerals - chalcogenides, sulphides, their intergrowths. The article presents a factor analysis and conditions for the elemental composition of tailings formation: mineralogical, technological and environmental. The territorial accessibility and technological capability of the investigated technogenic formations are analyzed. In the course of experimental studies, the elemental composition of stale tailings has been revealed - the main components of which are: iron, sulfur, silicon and aluminum. According to the results of X-ray phase analysis, it has been found that the main ore mineral of the tailings is pyrite. At the same time, it is noted that the main share of gold in the stale flotation tailings is presented in the form of sulphides in the form of finely dispersed and isomorphic inclusions. The heterogeneous morphometric and mineral composition of sulphide aggregates, their difficult opening and high dispersion characterize stale tailings as a raw material that is difficult to float. The revealed features of the material composition of stale tails indicate the impossibility of extracting valuable components (gold and silver) from this resource using existing traditional technologies. It has been proved that it is possible to effectively extract precious metals from this category of raw materials only after their deep opening by chemical processing. The relevance of the research lies in the need to process gold-containing man-made waste in order to significantly expand the raw material base of mining enterprises, as well as to improve the ecological situation of the city-forming mining enterprises of the South Urals. The aim of the research is to study the material composition of stale tailings and develop a technology for selective extraction of gold and silver. The object of research is the stale flotation tailings of copper-pyrite enterprises of the Southern Urals. The subject is the mineral composition, the content of useful components of lying tailings and the technology of gold and silver selective extraction from them. Material and research methods. During the experiments, a set of physicochemical and chemical methods of analysis has been used: thermodynamic analysis, synchronous thermal analysis using a combined thermal analyzer of the Netzsch STA 449 F3 Jupiter brand, UV spectroscopy with an automated data processing system), qualitative chemical and assay analyzes

The Chemical Technology for Producing Precious Metals from Enrichment Rejects of Copper-Pyrite Ores

2021 ◽  
Vol 316 ◽  
pp. 625-630
Author(s):  
Nadezhda L. Medyanik ◽  
Anton P. Ponomarev ◽  
Olga V. Yershova
Keyword(s):  
Economic Effect ◽  
Precious Metals ◽  
Payback Period ◽  
Chemical Technology ◽  
Chemical Extraction ◽  
Two Stage ◽  
Flotation Tailings ◽  
Metallurgical Combine ◽  
Copper Pyrite ◽  
Pyrite Ores

The chemical technology for recovery precious metals Au and Ag from mature flotation tailings of copper-pyrite ores by two-stage sintering with chlorine-ammonium reagents and leaching of bakes with water is developed. The chemical extraction of gold and silver is carried out, using NH4Cl and NH4NO3 reagents in the ratios of 1:1 at a temperature of 250 °C, and 2:1 at 200 °C. In accordance with the obtained results, a chemical technology of enrichment rejects of copper-pyrite ores processing and a scheme of primary apparatus chain for implementing this technology are proposed. The economic effect of the technology realization is calculated. This effect is 96.3 million rubles with a payback period of 8 years when processing enrichment rejects of copper-pyrite ores in amount of 109.5 thousand tons per year under the conditions of JSC “Uchaly Mining and Metallurgical Combine”.

scholarly journals Genetic Diversity Corylus avellana L. in Lesser Caucasus of Azerbaijan

2019 ◽  
Vol 5 (10) ◽  
pp. 40-49
Author(s):  
Z. Ibragimov ◽  
R. Alizade
Keyword(s):  
Cluster Analysis ◽  
Nuclear Dna ◽  
Sheet Material ◽  
Corylus Avellana ◽  
Issr Primer ◽  
Polymorphic Loci ◽  
Average Value ◽  
Geological Processes ◽  
Lesser Caucasus ◽  
Corylus Avellana L

The article is devoted to the results of a study of the genetic polymorphism of hazel (Corylus avellana (L.) H. Karst.), growing in the Lesser Caucasus within Azerbaijan. For the analyzes used nuclear DNA extracted from sheet material. DNA extraction, PCR and ISSR analyzes were carried out according to standard methods (CTAB, PCR, ISSR protocols). According to the results of analyzes using 4 ISSR primers, the number of identified fragments was 42, which corresponds to 9–12 loci per primer (~10.8). Of the 42 fragments identified, 34 (80.95%) are polymorphic, and 8 (19.05%) are monomorphic. The number of polymorphic loci varies in the range of 7–10. With the smallest number of amplified loci in the UBC811 primer, the largest number of them occurs in the UBC827 primer. Depending on the primer, the number of amplified polymorphic loci varies within 63–90%. The level of ISSR primer polymorphism is on average 86% (75–96%). The average value of the actual heterozygosis (H0) is 0.359, and the expected heterozygosis (HE) is 0.414. According to the results of the cluster analysis, 70 hazel genotypes are combined in 9 clusters. Despite the fact that the populations are remotely and orographically sufficiently isolated, which excludes the flow of genetic information between them, the results of the cluster analysis show that genotypes from different populations are combined into a common sub-cluster in terms of genetic similarity. This is due to the common origin of hazel in populations. In the distant past, this species was represented by an extensive common range, which was fragmented as a result of geological processes. The homogeneous disjunction of the continuous range occurred.

scholarly journals Ore Formation During Jurassic Subduction of the Tethys Along the Eurasian Margin: Constraints from the Kapan District, Lesser Caucasus, Southern Armenia

2019 ◽  
Vol 114 (7) ◽  
pp. 1251-1284 ◽  
Author(s):  
Johannes Mederer ◽  
Robert Moritz ◽  
Massimo Chiaradia ◽  
Richard Spikings ◽  
Jorge E. Spangenberg ◽  
...  
Keyword(s):  
Middle Jurassic ◽  
Late Jurassic ◽  
Ore Deposits ◽  
Sulfide Deposit ◽  
Short Time Interval ◽  
Ore Formation ◽  
Magmatic Arc ◽  
Argillic Alteration ◽  
Lesser Caucasus ◽  
Host Rocks

Abstract The Kapan mining district in the southernmost Lesser Caucasus is one of the few locations along the central Tethyan metallogenic belt where ore-forming processes were associated with magmatic arc growth during Jurassic Tethys subduction along the Eurasian margin. Three ore deposits of the Kapan district were investigated in this study: Centralni West, Centralni East, and Shahumyan. The ore deposits are hosted by Middle Jurassic andesitic to dacitic volcanic and volcaniclastic rocks of tholeiitic to transitional affinities below a late Oxfordian unconformity, which is covered by calc-alkaline to transitional Late Jurassic-Early Cretaceous volcanic rocks interlayered with sedimentary rocks. The mineralization consists of veins, subsidiary stockwork, and partial matrix replacement of breccia host rocks, with chalcopyrite, pyrite, tennantite-tetrahedrite, sphalerite, and galena as the main ore minerals. Centralni West is a dominantly Cu deposit, and its host rocks are altered to chlorite, carbonate, epidote, and sericite. At Centralni East, Au is associated with Cu, and the Shahumyan deposit is enriched in Pb and Zn as well as precious metals. Both deposits contain high-sulfidation mineral assemblages with enargite and luzonite. Dickite, sericite, and diaspore prevail in altered host rocks in the Centralni East deposit. At the Shahumyan deposit, phyllic to argillic alteration with sericite, quartz, pyrite, and dickite is dominant with polymetallic veins, and advanced argillic alteration with quartz-alunite ± kaolinite and dickite is locally developed. The lead isotope composition of sulfides and alunite (206Pb/204Pb = 18.17–18.32, 207Pb/204Pb = 15.57–15.61, 208Pb/204Pb = 38.17–38.41) indicates a common metal source for the three deposits and suggests that metals were derived from magmatic fluids that were exsolved upon crystallization of Middle Jurassic intrusive rocks or leached from Middle Jurassic country rocks. The δ18O values of hydrothermal quartz (8.3–16.4‰) and the δ34S values of sulfides (2.0–6.5‰) reveal a dominantly magmatic source at all three deposits. Combined oxygen, carbon, and strontium isotope compositions of hydrothermal calcite (δ18O = 7.7–15.4‰, δ13C = −3.4−+0.7‰, 87Sr/86Sr = 0.70537–0.70586) support mixing of magmatic-derived fluids with seawater during the last stages of ore formation at Shahumyan and Centralni West. 40Ar/39Ar dating of hydrothermal muscovite at Centralni West and of magmatic-hydrothermal alunite at Shahumyan yield, respectively, a robust plateau age of 161.78 ± 0.79 Ma and a disturbed plateau age of 156.14 ± 0.79 Ma. Re-Os dating of pyrite from the Centralni East deposit yields an isochron age of 144.7 ± 4.2 Ma and a weighted average age of the model dates of 146.2 ± 3.4 Ma, which are younger than the age of the immediate host rocks. Two different models are offered, depending on the reliability attributed to the disturbed 40Ar/39Ar alunite age and the young Re-Os age. The preferred interpretation is that the Centralni West Cu deposit is a volcanogenic massive sulfide deposit and the Shahumyan and Centralni East deposits are parts of porphyryepithermal systems, with the three deposits being broadly coeval or formed within a short time interval in a nascent magmatic arc setting, before the late Oxfordian. Alternatively, but less likely, the three deposits could represent different mineralization styles successively emplaced during evolution and growth of a magmatic arc during a longer time frame between the Middle and Late Jurassic.

Cluster analysis of the elemental composition of five austrian peats

1986 ◽  
Vol 191 ◽  
pp. 487-493
Author(s):  
Walter Kosmus ◽  
Reinhold Pietsch ◽  
Kurt J. Irgolic
Keyword(s):  
Cluster Analysis ◽  
Elemental Composition

Metallogeny of the Marco zone, Corvet Est, disseminated gold deposit, James Bay, Quebec, Canada

2012 ◽  
Vol 49 (10) ◽  
pp. 1154-1176
Author(s):  
Martin Aucoin ◽  
Georges Beaudoin ◽  
Robert A. Creaser ◽  
Paul Archer
Keyword(s):  
Gold Deposit ◽  
Basaltic Andesite ◽  
Native Gold ◽  
Gold Mineralization ◽  
Isotope Composition ◽  
Hanging Wall ◽  
Volcanic Rocks ◽  
Weighted Average ◽  
James Bay ◽  
Host Rocks

The Corvet Est gold deposit is hosted by Archean rocks of the Superior Province in the James Bay region, northern Quebec, Canada. The Marco zone is hosted by amphibolite-grade, strongly foliated volcanic rocks and consists of disseminated gold, with an apparent thickness ranging from 1.8 to 39.5 m and gold grades up to 23 g·t–1 over 1 m, that is continuous along strike for ∼1.3 km. The lithotectonic sequence comprises footwall basaltic andesite amphibolite overlain by a lenticular unit of metadacite and then by hanging-wall basaltic andesite amphibolite, all intruded by quartz–feldspar porphyry dikes. Dacite, basaltic andesite amphibolite, and quartz–feldspar porphyry show a calc-alkaline to transitional affinity and plot in the plate margin arc basalt field, with typical volcanic arc trace element patterns. Mineralization consists of pyrite, arsenopyrite, pyrrhotite, chalcopyrite, and gold, disseminated in deformed dacite, in andesite amphibolite, and in quartz–feldspar porphyry dikes. Dacite and andesite display weak alteration characterized by silicification. Native gold forms inclusions in metamorphic quartz, garnet, feldspar, arsenopyrite, and pyrite or free grains interstitial to quartz, feldspar, pyrite, chalcopyrite, and arsenopyrite. Free gold in late quartz veins cut the sericitized metamorphic fabric. Inclusion and interstitial native gold within minerals annealed during metamorphism shows that gold mineralization is pre- to syn-metamorphic, with some gold remobilized in later veins. Rhenium–osmium dating of arsenopyrite yields an isochron age of 2663 ± 13 Ma for mineralization and a weighted average model age of 2632 ± 7 Ma for arsenopyrite formed during peak metamorphism. The ∼2663 Ma arsenopyrite has a low initial 187Os/188Os of 0.19 ± 0.10, suggesting a juvenile crust or a mantle Os source. The sulfur isotope composition of Marco zone pyrite and arsenopyrite shows that sulfur could have been leached from its volcanic host rocks or from reduction of Archean seawater. The Corvet Est deposit is interpreted to be an orogenic gold deposit (2663 Ma) deformed and recrystallized during amphibolite-grade metamorphism (2632 Ma).

scholarly journals Native gold in the weathering crust of the Nizhneselemdzhinsky gold-bearing node (Amur region)

LITOSFERA ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 239-255
Author(s):  
I. V. Kuznetsova ◽  
P. P. Safronov
Keyword(s):  
River Basin ◽  
Noble Metal ◽  
Native Gold ◽  
Gold Deposits ◽  
Amur Region ◽  
Weathering Crust ◽  
Resource Base ◽  
Long Acting ◽  
Host Rocks ◽  
Gold Bearing

Research subject. The weathering crust of Proterozoic slates in the Neklya River basin and Paleozoic granites in the Nizh- neselemdzhinsky gold-bearing node (NGBN) in the Tatarka River basin.Methods. The research was carried out using the methods of atomic absorption, X-ray fluorescent and mineralogical analysis of rocks and minerals. The method of raster electron microscopy was used to study the element structure, morphological and microstructural features of minerals.Results. Specific features of native gold from the weathering crust of NGBK were defined. It was established that the NGBN weathering crust contains both hypogene gold, partially changed in the course of hypergenesis, and neogenic gold. A considerable share of gold is of high purity (1000%o). Occasionally, gold in the form of complex accretions from grains of different morphology and structure is present. A specific feature of weathering crust gold is its interpenetrations within the rock matrix of a varying mineral structure. Gold-bearing carbonaceous structures in the form of films and outgrowths on gold grains were revealed; the presence of carbon in rock components associating with the noble metal was defined. In the crust, the participation of carbon in physicochemical processes was established, as a result of which the release of Au, encapsulated in minerals-concentrators, and its redeposition on geochemical barriers occur. Gold nanoparticles can be long-acting growth centres in the host rocks, first coalescing with each other to yield nanoformations, then microforms, etc. In the weathering crust of gold deposits, both the transformation of the hypogenic noble metal and the formation of its new forms occur.Conclusion. This work contributes to the expansion of the mineral resource base of gold in the Amur Region, including through such unconventional sources as the NGBN weathering crust.

scholarly journals The Gersdorffite-Bismuthinite-Native Gold Association and the Skarn-Porphyry Mineralization in the Kamariza Mining District, Lavrion, Greece

Minerals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 531 ◽  
Author(s):  
Panagiotis Voudouris ◽  
Constantinos Mavrogonatos ◽  
Branko Rieck ◽  
Uwe Kolitsch ◽  
Paul Spry ◽  
...  
Keyword(s):  
Base Metal ◽  
Hydrothermal Fluid ◽  
Native Gold ◽  
Magmatic Fluid ◽  
Mining District ◽  
Sulfur Fugacity ◽  
Vein Type ◽  
Late Evolution ◽  
Initial Deposition ◽  
Host Rocks

Vein-type Pb-Ni-Bi-Au-Ag mineralization at the Clemence deposit in the Kamariza and “km3” in the Lavrion area, was synchronous with the intrusion of a Miocene granodiorite body and related felsic and mafic dikes and sills within marbles and schists in the footwall of (and within) the Western Cycladic detachment system. In the Serpieri deposit (Kamariza area), a porphyry-style pyrrhotite-arsenopyrite mineralized microgranitic dike is genetically related to a garnet-wollastonite bearing skarn characterized by a similar base metal and Ni (up to 219 ppm) enrichment. The Ni–Bi–Au association in the Clemence deposit consists of initial deposition of pyrite and arsenopyrite followed by an intergrowth of native gold-bismuthinite and oscillatory zoned gersdorffite. The zoning is related to variable As, Ni, and Fe contents, indicating fluctuations of arsenic and sulfur fugacity in the hydrothermal fluid. A late evolution towards higher sulfur fugacity in the mineralization is evident by the deposition of chalcopyrite, tennantite, enargite, and galena rimming gersdorffite. At the “km3” locality, Ni sulfides and sulfarsenides, vaesite, millerite, ullmannite, and polydymite, are enclosed in gersdorffite and/or galena. The gersdorffite is homogenous and contains less Fe (up to 2 wt.%) than that from the Clemence deposit (up to 9 wt.%). Bulk ore analyses of the Clemence ore reveal Au and Ag grades both exceeding 100 g/t, Pb and Zn > 1 wt.%, Ni up to 9700 ppm, Co up to 118 ppm, Sn > 100 ppm, and Bi > 2000 ppm. The “km3” mineralization is enriched in Mo (up to 36 ppm), Ni (>1 wt.%), and Co (up to 1290 ppm). Our data further support a magmatic contribution to the ore-forming fluids, although remobilization and leaching of metals from previous mineralization and/or host rocks, through the late involvement of non-magmatic fluid in the ore system, cannot be excluded.

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