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


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Prognosis, prospecting and exploration: Techniques and methods
Vladimirtseva O. V.1, Shatilova L. V.2, Gvozdeva I. A. 2, Bondarenko N. V. 2 TYPOMORPHIC FEATURES OF NATIVE GOLD, SNEZHNY STREAM, REPUBLIC OF SAKHA (YAKUTIA) DOI: 10.24411/0869-5997-2020-10009

1S. Ordzhonikidze Russian State Geological Prospecting University (MGRI), Moscow (Russia)

2Central Research Institute of Geological Prospecting for Base and Precious Metals (FSBI TsNIGRI), Moscow (Russia)

The area of Adycha river (Verkhoyansk district, Republic of Sakha (Yakutia)) midstream is characterized by extensive exogenetic gold potential development. Based on study results of typomorphic gold features from Snezhny stream technogenic deposits, Au-Sb ore formation native source type is suggested; its development within a single final placer formation cycle is concluded; an intermediate reservoir represented by Quaternary deposits of II flood-plain terrace, which is a ravine placer source, is identified.

Keywords: exogenetic gold potential, placer source, intermediate reservoir, internal gold structure, Adycha river midstream.

Vladimirtseva O. V. postgraduate1 This email address is being protected from spambots. You need JavaScript enabled to view it.

Shatilova L. V. senior researcher 2 This email address is being protected from spambots. You need JavaScript enabled to view it.

Gvozdeva I. A. researcher2 This email address is being protected from spambots. You need JavaScript enabled to view it.

Bondarenko N. V. PhD, Head of precious metals department2 This email address is being protected from spambots. You need JavaScript enabled to view it.

Karamyshev A. V.1 , 2, Fedorova K. S. 2, Tarasov A. V.1, 2 FORECAST FOR CONCEALED GOLD MINERALIZATION WITHIN CENTRAL KOLYMA REGION BASED ON A SET OF GEOLOGICAL AND GEOPHYSICAL FEATURES BY IDENTIFICATION METHOD DOI:10.24411/0869-5997-2020-10010

1 FSBEI Saint Petersburg State University, Saint Petersburg (Russia)

2 FSBI A. P. Karpinsky Russian Research Geological Institute, Saint Petersburg (Russia)

The paper presents results of a formalized (quantitative) assessment for Central Kolyma region (CKR) gold mineralization potential based on a set of geophysical, geological and geochemical features using IRP method. The method is based on image identification algorithm and involves division of numerous study targets into 2 classes: «ore» deposits, which are most similar to the known standard ore clusters, fields or deposits in terms of all the analyzed features, and conventionally «barren»; to characterize them, host environment including an area beyond the selected standard deposits is assessed. It is shown that geophysiacal fields display essential geological structure features of CKR known gold fields and clusters. Forecasting-prospecting geological/geophysical and geochemical features (localization criteria) typical of Ayan-Yuryakhskaya and Inyali-Debinskaya structural-formation zones are revealed. Areas prospective for new gold deposit discovery within CKR are recognized

Keywords: Central Kolyma region, mineralization forecast, gold deposits, image identification, forecast and search geological and geophysical features.

Karamyshev A. V. undergraduate, engineer 1, 2 This email address is being protected from spambots. You need JavaScript enabled to view it.

Fedorova K. S. postgraduate, 1st category geophysicist 2 This email address is being protected from spambots. You need JavaScript enabled to view it.

Tarasov A. V. PhD, associate Professor of geophysics department 1, 2 This email address is being protected from spambots. You need JavaScript enabled to view it.

Geology of ore deposits
Melnikov A. V. 1, Stepanov V. A. ( 2 THE GEOLOGICAL POSITION OF UNIQUE GOLD NUGGETS DISCOVERED IN NEW SOUTH WALES, AUSTRALIA, AND THE AMUR REGION, RUSSIA DOI:10.24411/0869-5997-2020-10011

1 Institute of Geology and Nature Management FEB RAS, Blagoveshchensk (Russia)

2 Research Geotechnological Center FEB RAS, Petropavlovsk-Kamchatsky (Russia)

A comparative description of the geological structure typical of discovery areas of a unique nugget known as the Holterman Plate (New South Wales, Australia) and a nest of large nuggets comparable in weight to it (Amur region, Russia) is given. It was shown that in both cases gold-quartz mineralization was the primary nugget source. The Holterman Plate nugget is formed by destruction of the upper part of the major Hill End gold deposit, which is represented by a series of stratiform quartz veins. A nest consisting of 665 nuggets with a total weight of 79 kg was found when mining the Gar-2 placer of the Yasnensky ore-placer cluster of the Amur province. In the placer area, gold-quartz occurrences predominate. Gold-quartz type gold deposits are forecasted to be identified there.

Keywords: gold nuggets, deposit, placer, gold-quartz formation.

Melnikov A. V. PhD, leading researcher of ore genesis laboratory 1 This email address is being protected from spambots. You need JavaScript enabled to view it.

Stepanov V. A. PhD, Professor, chief researcher 2 This email address is being protected from spambots. You need JavaScript enabled to view it.

Moskvitina M. L. 2, Damdinov B. B. 1, Damdinova L. B. 1, Izvekova A. D. 1 MINERAL ASSOCIATIONS OF QUARTZ-SULFIDE ORES, ZUN-KHOLBA GOLD DEPOSIT, EASTERN SAYANY DOI:10.24411/0869-5997-2020-10012

1 FSBSI Geological Institute SB RAS, Ulan-Ude (Russia)

2FSBEI D. Banzarov Buryat State University, Ulan-Ude (Russia)

The paper presents study results of mineral composition for the main quartz-sulfide ores within Zun-Kholba gold deposit, the largest in Eastern Sayany. Three mineral ore types are revealed: compact pyrite-pyrrhotite, quartzcarbonate-sulfide and quartz-polymetallic. Native gold is represented by four morphological types: rounded and drop-like inclusions in nonmetalliferous mass; irregular intergrowths with other ore minerals (galena, sphalerite, chalcopyrite); angular ingrowths of gold grains in quartz and pyrite; veinlet-like gold discharge along fractures in pyrite. However, no dependence of native gold composition on morphology as well as ore occurrence depth is noted. The general fineness values range varies from 350‰ to 950‰. In terms of mineral relationships, four ore associations are established: pyrite-pyrrhotite, quartz-carbonate-sulfide, quartz-polysulfide and sulfosalt corresponding to the preore stage and three successive ore formation stages.

Keywords: Eastern Sayany, Zun-Kholba gold deposit, mineral associations, gold.

Moskvitina M. L. undergraduate 2 This email address is being protected from spambots. You need JavaScript enabled to view it.

Damdinov B. B. PhD, leading researcher 1 This email address is being protected from spambots. You need JavaScript enabled to view it.

Damdinova L. B. PhD, senior researcher This email address is being protected from spambots. You need JavaScript enabled to view it.

Izvekova A. D. postgraduate 1 This email address is being protected from spambots. You need JavaScript enabled to view it.

Seravina T. V., Kuznetsov V. V., Kudryavtseva N. G., Kuznetsova T. P., Elshina S. L. SILVER-LEAD-ZINC DEPOSITS IN VOLCANOGENIC ASSOCIATIONS OF THE CHEREMSHANSKY ORE CLUSTER, DALNEGORSKY ORE DISTRICT DOI:10.24411/0869-5997-2020-10013

Central Research Institute of Geological Prospecting for Base and Precious Metals (FSBI TsNIGRI), Moscow (Russia)

Silver-lead-zinc deposits of the Cheremshansky ore cluster (Dalnegorsky ore district, Taukhinskaya mineragenic zone) are characterized by vein, stratiform and stockwork ore bodies. Economic polymetallic mineralization is localized outside the vent zones of paleovolcanic structures, in faulting systems, in Cretaceous silty-sandstone and basalt-andesite-dacite-rhyolite rocks. The main ore minerals are pyrrhotite and sphalerite; subordinate pyrite, galena, chalcopyrite, arsenopyrite, marcasite, pentlandite, and boulangerite are also present. Standard deposits are Krasnogorskoye and Maiminovskoye

Keywords: Dalnegorsky ore district, Cheremshansky ore cluster, silver-lead-zinc deposits

Seravina T. V. PhD, Deputy Head of base metals department This email address is being protected from spambots. You need JavaScript enabled to view it.

Kuznetsov V. V. PhD, Head of base metals department

Kudryavtseva N. G. PhD, senior researcher

Kuznetsova T. P. PhD, leading researcher

Elshina S. L. senior researcher

Geology of diamond deposits
Gorev N. I.1, Kolesnik A. Yu.1, Nikolenko E. I. 1,2, Protsenko E. V.1, Starostin P. V. 1, Shakhurdina N. K.1 FORMATION HISTORY OF MIDDLE PALEOZOIC KIMBERLITES OF THE ALAKIT-MARKHA FIELD, WESTERN YAKUTIA DOI:10.24411/0869-5997-2020-10014

1 Research geological enterprise, ALROSA JSC, Mirny (Russia)

2 Institute of Geology and Mineralogy, Siberian branch of the Russian Academy of Sciences, Novosibirsk, (Russia)

Kimberlites of the Alakit-Markha field formed in the middle Paleozoic and were repeatedly eroded over a long time period. Measured surface kimberlite erosion is compared with the reconstructed thickness of the host rocks, which includes sedimentary and igneous rocks of the Tunguska syneclise. The surface erosion of host rocks of individual kimberlites contradicts to their size and shape. Kimberlite formation features by stages are considered. The discrepancy between kimberlite size and shape, and volume of host rocks surface erosion is explained. The two-stage manifestation of the middle Paleozoic kimberlite formation is confirmed: late Silurian – early Devonian and late Devonian – early Carboniferous. Three sub-stages are distinguished in the last stage

Keywords: diamond, kimberlite, erosion, middle Paleozoic, absolute age, xenolith, Western Yakutia.

Gorev N. I. PhD, leading researcher 1 This email address is being protected from spambots. You need JavaScript enabled to view it.

Kolesnik A. Yu. Head of laboratory 1 This email address is being protected from spambots. You need JavaScript enabled to view it.

Nikolenko E. I. PhD, Head of laboratory1,2 This email address is being protected from spambots. You need JavaScript enabled to view it.

Protsenko E. V. Head of department1 This email address is being protected from spambots. You need JavaScript enabled to view it.

Starostin P. V. junior researcher 1 This email address is being protected from spambots. You need JavaScript enabled to view it.

Shakhurdina N. K. senior researcher 1 This email address is being protected from spambots. You need JavaScript enabled to view it.

Kedrova T. V., Bogush I. N., Zinchuk N. N., Bardukhinov L. D., Lipashova A. N. DIAMONDS FROM THE UKUGUT SUITE OF THE NYURBINSKAYA PLACER, NAKYN KIMBERLITE FIELD DOI:10.24411/0869-5997-2020-10015

Research geological enterprise, ALROSA JSC, Mirny (Russia)

Diamonds of the upper deposit of the Nyurbinsky placer have been studied. Mineralogical and optical-spectroscopic characteristics of diamonds from deposits of Ukugut suite are shown. Location patterns of diamonds with certain placer parameters have been revealed. The zonal mode of distribution for Ukugut suite diamond properties is established due to concentration peculiarities of material from different primary sources. At the same time, signs of crystal sorting as a result of sedimentation processes were recorded.

Keywords: diamonds, placers, Nakyn kimberlite field

Kedrova T. V. (senior This email address is being protected from spambots. You need JavaScript enabled to view it.

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

Zinchuk N. N. PhD, Professor, Academician of the Academy of Sciences of Sakha Republic (Yakutia)), chief researcher This email address is being protected from spambots. You need JavaScript enabled to view it.

Bardukhinov L. D. Head of laboratory This email address is being protected from spambots. You need JavaScript enabled to view it.

Lipashova A. N. senior researcher This email address is being protected from spambots. You need JavaScript enabled to view it.

GEOLOGISTS ABOUT WAR

Fragments from the book А. А. Konstantinovsky «Далёкие голоса»

CONGRATULATIONS ON ANNIVERSARY

A.F. Morozova

G.K. Khachatryan

MEMORY

B. A. Yatskevich

B. K. Mikhailova

A. A. Cheremisina

B. Ya. Vikhtera

A. G. Volarovich

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