Magazine «RUDY I METALLY» («ORES AND METALS»)


Победа
Обложка журнала

Read in the latest issue of the magazine

(click on the title of the article to view the annotation)
APPLIED METALLOGENY
A.P. Maslovsky GOLD DEPOSITS OT THE GUIANA SHIELD

JSC Pokrovsky mine, Moscow

The article provides a comparative analysis of Guyana and Venezuela major deposits within the Quartzstone ore field (Guyana). From the northwest to the southeast (from Venezuela to Brazil), more than 10 ore gold deposits are currently known, their total resources (including previous production) exceed 2,600 tons of gold (excluding the Amapari and Salamangoni deposits in Brazil). Almost all of Guyana deposits are confined to the Lower Proterozoic greenstone belts of the Guiana shield identified and explored for the past 15–20 years. The geological features of the largest deposits (Omay, Aurora, Toroparu, Tassawini and Monosi) are presented in the article.

Keywords: gold, ore field, deposits, Guiana shield, greenstone belt, Lower Proterozoic, shear zones, batholite, intrusive stock, ore veins, volcanosedimentary rocks, granites.

A.P. Maslovsky (director of business development) This email address is being protected from spambots. You need JavaScript enabled to view it.

PROGNOSIS, PROSPECTING AND EXPLORATION: TECHNIQUES AND METHODS
Rogizny V. F., Kulikov D. A., Migachev I. F., Donets A. I. OPENING AND MINING OF Pt-Pd-Cu-Ni ORES, NITTIS-KUMUZHIYA-TRAVYANAYA AREA

FSBI Central Research Institute of Geological Prospecting for Base and Precious Metals, Moscow

The paper reviews the mining potential of opening and mining the Nittis-Kumuzhiya-Travyanaya (NKT) area using conveyor transport, advanced equipment and filling the worked-out area to improve plant capacity and reduce environmental damage to the area. Analysis was performed for a prospective scheme of mining additionally explored areas of Donnaya orebody as well as feasible options of ascending excavation involving selective breaking of thin veins. Results of consolidated geological and economic estimate for NKT reserves to a depth of 500 m are presented. The authors believe that this technology is efficient due to reduced dilution and ore losses, improved miners’ work conditions, lower power and labor costs as well as higher ore throughput

Keywords: Monchegorsk ore district, Donnaya orebody, NKT area opening and mining, conveyor and truck ramps, mine filling systems, mine haulage using dump trucks, additional vein zone mining using small-sized equipment, consolidated geological and economic estimate of conventional NKT reserves, Pd eq.

V. F. Rogizny (PhD, leading researcher) This email address is being protected from spambots. You need JavaScript enabled to view it.

D. A. Kulikov (Phd, head of department) This email address is being protected from spambots. You need JavaScript enabled to view it.

I. F. Migachev (PhD, chief researcher)

A. I. Donets (PhD, leading researcher)

Yazikov E. G.1, Filimonenko E. A.1, Mishankin A. Yu.1, Sobyanin Yu. P.2, Karpenko Yu. A.1 TESTWORK TO IMPROVE BIOCHEMICAL GOLD PROSPECTING METHOD WITHIN A CRYOLITE ZONE (EXAMPLE FROM VYUNSKOYE ORE FIELD, REPUBLIC OF SAKHA, YAKUTIA)

1 National Research Tomsk Polytechnic University, Tomsk

2 LLC Boguslavets, Yakutsk

The paper presents the results of testwork using biochemical gold prospecting method within the Vyunskoye ore field in a cryolite zone. A comparative elemental analysis on a control profile of various biocomponents combined with lithochemical and concentrate sampling data is provided. Based on the study results, it was found that studies should be focused on moss when using biochemical gold prospecting methods in a cryolite zone

Keywords:ore field, gold, biogeochemical method, biocomponents, lithochemical sampling.

E. G. Yazikov (PhD, professor ) 1 This email address is being protected from spambots. You need JavaScript enabled to view it.

E. A. Filimonenko (PhD, senior lecturer )1 This email address is being protected from spambots. You need JavaScript enabled to view it.

A. Yu. Mishankin (postgraduate ) 1 This email address is being protected from spambots. You need JavaScript enabled to view it.

Yu. P. Sobyanin (director ) 2 This email address is being protected from spambots. You need JavaScript enabled to view it.

Yu. A. Karpenko (postgraduate ) 1 This email address is being protected from spambots. You need JavaScript enabled to view it.

GEOLOGY OF ORE DEPOSITS
Tolstov A. V., Cherenkov V. G., Baranov L. N GENESIS AND AGE OF THE TOMTOR Nb AND RARE-EARTH DEPOSIT ORE SEQUENCE, NORTHEASTERN SIBERIAN PLATFORM

1 Research Geological Enterprise JSC ALROSA (PJSC), Mirny

2 FSBI VSEGEI, Moscow branch

3 Institute of Geology and Mineralogy SB RAS, Novosibirsk

The northeastern Siberian platform (Republic of Sakha, Yakutia) hosts the Udzhinskaya province of alkaline ultrabasic massifs with carbonatites as final p hases o f m agmatic s ystem e volution; t hey f orm i ts c entral c arbonatite core and are characterized by elevated Fe, Al and P concentrations. They also contain a complex of rare and rare-earth elements. Crust of laterite weathering of up to 400 m thick is present within the massifs. Phosphate, Nb, Y, Sc and TR content in crust of carbonatite weathering is much higher compared to unaltered rock differences. Their maximum values are in the sequence of specific s edimentary d eposits f ormed a s d enudation p roducts o f o re-bearing c arbonatite crust precipitated in minor lake depressions and due to their intensive chemogenic transformation in hot humid climate. They are unique high-grade ores, with no world analogs in terms of mineral potential. Sometimes, these rocks are their natural concentrates averaging (in weight %) 7,21 Nb2O5, 0,578 Y2O3, 0,045 Sc2O3 and 10,16 TR2O3. The rocks composing the ore-bearing sequence show distinct evidence of sedimentary genesis: well-pronounced layered texture and facial zoning, presence of carbonized vegetable detrite and bacteriomorphic aggregates. Therefore, it is reasonable to regard a set of these formations as an independent stratigraphic unit, Tomtor sequence. Geological data suggest that it formed 340-280 Ma. Tomtor sequence can be an important prospecting criteria in prospecting for rare and rare-earth elements

Keywords: carbonatites, rare and rare-earth elements, Tomtor massif, crust of weathering, laterites, layering, facies, pyrochlore, crandallite.

A. V. Tolstov (PhD, director of JSC ALROSA ) 1, 3 This email address is being protected from spambots. You need JavaScript enabled to view it.

V. G. Cherenkov (chief geologist ) 2 This email address is being protected from spambots. You need JavaScript enabled to view it.

L. N. Baranov (researcher, JSC ALROSA )1, 3 This email address is being protected from spambots. You need JavaScript enabled to view it.

COMPOSITION AND PROPERTIES OF ROCKS AND ORES
Spetsius Z. V., Liskovaya L. V., Ivanov A. S., Bogush I. N. FEATURES OF GARNET AND CLINOPYROXENE IN DIAMONDIFEROUS ECLOGITES FROM THE UDACHNAYA KIMBERLITE PIPE, YAKUTIA: METASOMATOSIS EVIDENCE

Research Geological Enterprise JSC ALROSA (PJSC), Mirny

Mineralogy of diamondiferous eclogite xenolites showing metasomatosis evidence from the Udachnaya kimberlite pipe is discussed. The paper also reviews features of diamonds they contain, compositions of primary garnets and omphacites as well as alteration of structural and species compositions of original garnets and clinopyroxenes during metasomatosis. Based on pyrope structure update, two-phase garnet composition is suggested, which is mostly represented by complex pyrope associated with Ca-pyrope. In all samples, primary omphacite is replaced by another clinopyroxene variety depleted in Na2O, which is typical of partial melting products. Geothermometry results suggested that the eclogites formed within a temperature range of 1,000–1,2000 °C. Based on diamond morphology, data on total N content in diamonds and its aggregation, multiple stages of diamond formation in eclogites and the most probable growth of later diamond generations impacted by metasomatizing mantle fluids containing carbon are postulated. It is suggested that certain diamond formation stages probably had a time gap of several hundred million years.

Keywords: kimberlites, eclogite xenoliths, diamonds, garnets, pyroxenes, metasomatosis.

Z. V. Spetsius (PhD, chief researcher) This email address is being protected from spambots. You need JavaScript enabled to view it.

L. V. Liskovaya (PhD, senior researcher) This email address is being protected from spambots. You need JavaScript enabled to view it.

A. S. Ivanov (PhD, leading researcher) This email address is being protected from spambots. You need JavaScript enabled to view it.

I. N. Bogush (PhD, leading researcher) This email address is being protected from spambots. You need JavaScript enabled to view it.

Yurichev A. N. ACCESSORY SULPHIDES AND ARSENIDES FROM CHROMYTITES OF KHARCHERUZ ULTRAMAFIC MASSIF, THE POLAR URALS

Tomsk State University, Tomsk

The study is focused on accessory sulfide mineralization revealed in massive chromitites of Kharcheruz ultramafic massif, which is part of the Khadatinsky ophiolite belt closing ophiolite complexes of the Polar Urals in the north. Three paragenetic associations of accessory sulfides associated with various processes of host chromitites formation and transformation are identified. Typomorphic and chemical features of ore minerals are characterized.

Keywords: The Polar Urals, ophiolites, Kharcheruz massif, ultramafic rocks, chromitites, accessory sulfides, chemistry, genesis.

А. N. Yurichev (PhD, аssociate рrofessor of Petrography department) This email address is being protected from spambots. You need JavaScript enabled to view it.

GEOLOGISTS ABOUT THE WAR

Fragments of S. D. Sher manuscript, «The War Years»

PAGES OF HISTORY

A. A. Konstantinovsky. «I was sure I will become an artist…»

Thirty years later. Publication background of S. D. Sher book «My geological life»

OUR CONGRATULATIONS

А. N. Barishev

N. A. Leonova

IN MEMORIUM

I. А. Karpenko

O. S. Nabrovenkov


Ores and Metals» list of publications 2020

Download the electronic version of the journal