scholarly journals Platinum and platinoids in the Bolotisty gold-placer deposit (Khabarovsky Krai, Russia)

2020 ◽  
Vol 192 ◽  
pp. 03012
Author(s):  
Natalya Lavrik ◽  
Valentina Stepanova ◽  
Alexandra Lavrik
Keyword(s):  
Grain Size ◽  
Sedimentary Rocks ◽  
Precious Metals ◽  
Placer Deposit ◽  
Iron Impurity ◽  
Intrusive Body ◽  
Gold Placer ◽  
Mineralogical Analysis ◽  
Basic Composition ◽  
Platinum Mineralization

The article shows the results of studies the platinum mineralization (within the framework of studying the complexity of deposits) in the waste of heavy concentrate in the southeastern flank of the Bolotisty gold-placer deposit, which the located in the Khabarovsky Krai (Russia). The deposit is localized in the “erosion window” among the covers of Miocene basalts and Eocene andesites, where Cretaceous sedimentary, tuffaceous-sedimentary rocks of the basement of the volcano structure, broken through by an Eocene intrusive body of intermediate and basic composition, come to the surface. An abbreviated mineralogical analysis for monofraction of precious metals was carried out for a concentrate fraction weighing 1.813 kg with a grain size of -3.0 + 0.1 mm. Gold and platinum were found - 1.38 mg and 1.08 mg. Platinum has an iron impurity up to 3-5 % Fe and Cu, Ir, Rh impurities are variable. There are plate-like inclusions of native osmium with an admixture of ruthenium in 43 % of the studied platinum grains. There are single inclusions of ehrlichmanite. A large amount of high-temperature dipyramidal quartz, along with magnetite, chromite, tourmaline and other minerals is a characteristic feature of the concentrate and platinum grains of this area.

scholarly journals Au-Ag-Pd-Pt mineralization in sedimentary rocks associated with Triassic carbonaceous silicites of Sikhote-Alin

LITOSFERA ◽  
2018 ◽  
pp. 892-913
Author(s):  
Valentin T. Kazachenko ◽  
Elena V. Perevoznikova
Keyword(s):  
Organic Matter ◽  
Intermetallic Compounds ◽  
Sedimentary Rocks ◽  
Precious Metals ◽  
Contact Metamorphism ◽  
Sikhote Alin ◽  
Gold Silver ◽  
Silver Palladium ◽  
Platinum Mineralization ◽  
Palladium Platinum

Subject.The paper is devoted to the study of the gold-silver-palladium-platinum mineralization of the streaky systems in the sedimentary rocks associated within the Triassic carbonaceous silicites of the Taukhinsky and Samarkinsky terranes of the Sikhote-Alin.Materials and methods.In the process of investigations we studied the metamorphosed carbonaceous siliceous-clay rocks and systems of the mineralized fractures in the Triassic siliceous-clay and siliceous (including jaspers) rocks of Shirokopadninskaya, Vysokogorskaya and Gornaya areas, as well as in the sandstones (unclarified age) of Gornaya area. The samples for the analytical study were taken with the lump way. To estimate the content of precious metals in the rocks, cut by the systems of the mineralized fractures, we used the fire assay and atomic-absorption methods. The analyses of minerals (in polished sections) have been done using the JXA-5A and JXA8100 microanalysers.Results.The gold-silver-palladium-platinum mineralization in the siliceous and clay-siliceous rocks, as well as in the sandstones is restricted to the systems of the mineralized fractures and by many features are analogous to the precious-metal mineralization of the black-shale formations. It is represented by native forms, disordered solid solutions, and intermetallic compounds of different metals. The specificity of the Au-Ag-Pd-Pt mineralization is a wide distribution of copper gold, Ni-, Cu-, and Pbbearing gold, and Zn-bearing platinum. Native elements and intermetallic compounds, including those of precious metals, are not rarely associated with the organic matter testifying to the active participation of carbon and, probably, hydrogen that provided the high- and ultra-reduction character of the processes of mineral formation.Conclusions.The presence of the mineral forms of different maximum reduced metals is caused by the influence of the organic matter of the Triassic carbonaceous silicites. This consisted in the removal of the most volatile components, and first of all the poorly bound water and hydrocarbons from the carbonaceous rocks through the contact metamorphism related with the injection of the granitoid intrusions of Cretaceous plutonic and volcanoplutonic belts.

Notes on Petrographic Methods

1923 ◽  
Vol 60 (4) ◽  
pp. 165-168
Author(s):  
P. G. H. Boswell
Keyword(s):  
Grain Size ◽  
Sedimentary Rocks ◽  
Work Done

Many workers in the domain of the petrology of sedimentary rocks will welcome the article by Dr. Rastall in the Geological Magazine for January, 1923, and will appreciate the fact that certain notes therein help to make clear what may or may not reasonably be expected from this branch of geology. Judging from what has been said and written from time to time, I fear there is some amount of misconception as to what is being and has been achieved by the study of the rarer minerals and grain-size of sediments. As Dr. Rastall has paid me the compliment of referring to certain work with which I was concerned, in part during the war, it may be of interest and service if I indicate briefly the character of some of the work done and the utility of the petrographic methods adopted.

scholarly journals Current methods of technogenic gold placer deposit mining with small size gold extraction technology

2021 ◽  
Vol 43 (4) ◽  
pp. 458-466
Author(s):  
S. A. Prokopiev ◽  
E. S. Prokopiev ◽  
I. V. Kadesnikov ◽  
N. A. Cherimichkina
Keyword(s):  
Raw Materials ◽  
Mineralogical Composition ◽  
Placer Deposit ◽  
Gold Recovery ◽  
Raw Material ◽  
Productive Capacity ◽  
Gold Content ◽  
Gold Placer ◽  
Gold Extraction ◽  
Extraction Technology

The purpose of this article is to conduct industrial tests of spiral separation technology on technogenic refractory raw materials. The object of the study is the Yurskoye gold placer deposit in the Republic of Sakha (Yakutia). An OKV-100 benefication complex with the productive capacity of 100 m3 /h by initial sands was set up in order to conduct pilot mining of the fine-grained tailings dumps of the Yurskoye deposit with the maximum extraction of small size gold. Sands supplied from the different sections of the technogenic deposit had different gold content, granulometric characteristics, and mineralogical composition. The study included experiments carried out at different initial feed; equipment was adjusted for specific raw material depending on productive capacity, liquid/solid ratio, product yield of the small size gold recovery module. The complex productivity was from 90 to 150 m3 /h. The yield and extraction of gold-bearing concentrate, as well as its gold content were determined. The pilot washing with the use of small size gold recovery technology resulted in the average additional gold recovery from sluice tailings of 19.07 %, which is a high indicator, given the low content of gold in technogenic placers. The technology under consideration can be used for the development of both technogenic and operated gold placer deposits.

scholarly journals Grain Size and Mineralogy of Sediments and Sedimentary Rocks, DSDP Leg 35

1976 ◽  
Author(s):  
Y.A. Bogdanov ◽  
V.N. Zhivago ◽  
A.P. Lisitzin ◽  
V.V. Serova ◽  
E.N. Zharikova
Keyword(s):  
Grain Size ◽  
Sedimentary Rocks

scholarly journals Separation of Monazite from Placer Deposit by Magnetic Separation

Minerals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 149 ◽  
Author(s):  
Kwanho Kim ◽  
Soobok Jeong
Keyword(s):  
Rare Earth ◽  
Magnetic Separation ◽  
Industrial Revolution ◽  
Supply And Demand ◽  
Modern Technology ◽  
Placer Deposit ◽  
Limited Information ◽  
Mineralogical Analysis ◽  
Separation Result ◽  
Magnetic Product

In this study, mineralogical analysis and beneficiation experiments were conducted using a placer deposit of North Korea, on which limited information was available, to confirm the feasibility of development. Rare earth elements (REEs) have vital applications in modern technology and are growing in importance in the fourth industrial revolution. However, the price of REEs is unstable due to the imbalance between supply and demand, and tremendous efforts are being made to produce REEs sustainably. One of them is the evaluation of new rare earth mines and the verification of their feasibility. As a result of a mineralogical analysis, in this placer deposit, monazite and some amount of xenotime were the main REE-bearing minerals. Besides these minerals, ilmenite and zircon were the target minerals to be concentrated. Using a magnetic separation method at various magnetic intensities, paramagnetic minerals, ilmenite (0.8 T magnetic product), and monazite/xenotime (1.0–1.4 T magnetic product) were recovered selectively. Using a magnetic separation result, the beneficiation process was conducted with additional gravity separation for zircon to produce a valuable mineral concentrate. The process resulted in three kinds of mineral concentrates (ilmenite, REE-bearing mineral, and zircon). The content of ilmenite increased from 32.5% to 90.9%, and the total rare earth oxide (TREO) (%) of the REE-bearing mineral concentrates reached 45.0%. The zircon concentrate, a by-product of this process, had a Zr grade of 42.8%. Consequently, it was possible to produce concentrates by combining relatively simple separation processes compared to the conventional process for rare earth placer deposit and confirmed the possibility of mine development.

Material Composition of Technogenic Ores in Tails of Zhezkazgan Enrichment Factory (Central Kazakhstan)

2016 ◽  
Vol 858 ◽  
pp. 366-370
Author(s):  
Adilkhan Baibatsha ◽  
Kulyash Dyussembayeva ◽  
Alma Bekbotayeva
Keyword(s):  
Grain Size ◽  
Raw Materials ◽  
Precious Metals ◽  
Microscopic Description ◽  
Reliable Source ◽  
Ore Minerals ◽  
Lead Zinc ◽  
And Storage ◽  
Extraction Of Metals ◽  
Copper Lead

Total reserves in tails in enrichment factories account for about 1.0 billion tons, and they contain copper, lead, zinc and precious metals. Therefore such tailings can be considered a major technological company and a reliable source of raw materials to build of processing company. We have studied the conditions of distribution and storage of tailings from enrichment plants. Microscopic description of the tailings material gave the following data. Chalcopyrite prevalent among the copper minerals covellite is most common in the second place, rare chalcocite, bornite, sphalerite, pyrite, arsenopyrite. The grain size of the sulfides is generally 0.01-0.03 mm. The sulfides are mainly quartz or fused to it. Rarely observed aggregates are covellite-bornite, chalcopyrite-covellite and chalcopyrite-bornite. However, not all sulphides ore sufficiently disclosed, most of them are located within grains the surrounding rocks. If disclosed ore minerals associated with grains of rocks less than 100 microns, they can be readily available for leaching. To increase the fullness of extraction of metals from sulfide located inside rock grains larger than 150-200 microns, additional measures for their opening.

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