Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 75089 10.2205/2025ES000990 kaoxtp ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Gold in Ores of the Natalka Giant Deposit (North East Russia): Content, Distribution and Speciation Gold in Ores of the Natalka Giant Deposit (North East Russia): Content, Distribution and Speciation https://orcid.org/0000-0002-5153-6871 Кравцова Раиса Григорьевна Kravtsova Raisa Grigor'evna krg@igc.irk.ru

доктор геолого-минералогических наук;

doctor of geological and mineralogical sciences;

 https://orcid.org/0000-0002-6970-7501 Макшаков Артем Сергеевич Makshakov Artem Sergeevich artem_m@mail.ru

кандидат геолого-минералогических наук;

candidate of geological and mineralogical sciences;

 https://orcid.org/0000-0001-8704-6105 Таусон Владимир Львович Tauson Vladimir L'vovich vltauson@igc.irk.ru

доктор химических наук;

doctor of chemical sciences;

 https://orcid.org/0000-0001-8335-5656 Липко Сергей Владимирович Lipko Sergey Vladimirovich lipko@igc.irk.ru

кандидат химических наук;

candidate of chemical sciences;

 https://orcid.org/0000-0002-8098-3590 Белозерова Ольга Юрьевна Belozerova Olga Yur'evna obel@igc.irk.ru

кандидат химических наук;

candidate of chemical sciences;

 ФГБУН Институт геохимии им. А.П. Виноградова СО РАН Иркутск Россия Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences Irkutsk Russian Federation ФГБУН Институт геохимии им. А.П. Виноградова СО РАН Иркутск Россия Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences Irkutsk Russian Federation ФГБУН Институт геохимии им. А.П. Виноградова СО РАН Иркутск Россия Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences Irkutsk Russian Federation ФГБУН Институт геохимии им. А.П. Виноградова СО РАН Иркутск Россия Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences Irkutsk Russian Federation ФГБУН Институт геохимии им. А.П. Виноградова СО РАН Иркутск Россия Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences Irkutsk Russian Federation 18 03 2025 18 03 2025 25 1 1 21 12 02 2024 22 01 2025 https://rjes.ru/en/nauka/article/75089/view

The content, distribution and speciation of gold in ores of the Natalka deposit (North East Russia) were studied. According to atomic absorption spectrometry (AAS), the vein and veinlet-vein ores are highest grade in gold, whereas veinlet-disseminated ores are lower grade and disseminated ores are poor in gold. According to light microscopy and electron probe microanalysis, up to 85% of gold in the Natalka ores is represented by large and small grains of free native gold associated with gangue and sulfide minerals. The gold grains of 0.01 to 2 mm in size are dominated and their fineness vary from 720 to 860 ‰. Up to 20% of native gold is represented by finely dispersed particles < 0.01 mm in size and a fineness of 750–990‰. Most of this gold is fixed and bounded mainly to with sulfides. According to “phase” chemical analysis with AAS, arsenopyrite is richest in gold whereas pyrite is poorer in gold. Using AAS with analytical data selections for single crystals, two non-mineral forms of “invisible” gold were found in these sulfides, namely the structurally bound (structural) and surficially bound (surficial) forms. The structural gold is incorporated into the mineral structure. The surficial form is confined to nano-sized non-autonomous phases on the sulfide mineral surfaces and often dominates over the structural form. The maximum gold concentrations on the surface of arsenopyrite and pyrite were confirmed by LA-ICP-MS data. It is expected that not all “invisible” gold is a refractory gold. The major part of gold contained in arsenopyrite and pyrite as finely dispersed, micron- and submicron-sized particles, as well as the surficially bound gold, can be extracted with modification of current flowsheet, which enhances the value of the gold ores at the Natalka deposit.

The content, distribution and speciation of gold in ores of the Natalka deposit (North East Russia) were studied. According to atomic absorption spectrometry (AAS), the vein and veinlet-vein ores are highest grade in gold, whereas veinlet-disseminated ores are lower grade and disseminated ores are poor in gold. According to light microscopy and electron probe microanalysis, up to 85% of gold in the Natalka ores is represented by large and small grains of free native gold associated with gangue and sulfide minerals. The gold grains of 0.01 to 2 mm in size are dominated and their fineness vary from 720 to 860 ‰. Up to 20% of native gold is represented by finely dispersed particles < 0.01 mm in size and a fineness of 750–990‰. Most of this gold is fixed and bounded mainly to with sulfides. According to “phase” chemical analysis with AAS, arsenopyrite is richest in gold whereas pyrite is poorer in gold. Using AAS with analytical data selections for single crystals, two non-mineral forms of “invisible” gold were found in these sulfides, namely the structurally bound (structural) and surficially bound (surficial) forms. The structural gold is incorporated into the mineral structure. The surficial form is confined to nano-sized non-autonomous phases on the sulfide mineral surfaces and often dominates over the structural form. The maximum gold concentrations on the surface of arsenopyrite and pyrite were confirmed by LA-ICP-MS data. It is expected that not all “invisible” gold is a refractory gold. The major part of gold contained in arsenopyrite and pyrite as finely dispersed, micron- and submicron-sized particles, as well as the surficially bound gold, can be extracted with modification of current flowsheet, which enhances the value of the gold ores at the Natalka deposit.

 Natalka deposit gold ores content distribution gangue minerals sulfide minerals arsenopyrite pyrite speciation Natalka deposit gold ores content distribution gangue minerals sulfide minerals arsenopyrite pyrite speciation The study was supported by Russian Science Foundation (grant No. 24-27-00140), https://rscf.ru/project/24-27-00140/. The equipment of the center for collective use “Isotopic and Geochemical Research” of IGC SB RAS (Irkutsk, Russia) was used. The authors thank Taisa Pastushkova, Irina Voronova and Nikolay Bryansky for assistance in analytical studies. We would like to express our special gratitude to all geological services of the “Matrosov mine” public corporation (Magadan, Russia) for comprehensive assistance in conducting fieldwork. We are also greatly indebted to anonymous reviewers for valuable comments. The study was supported by Russian Science Foundation (grant No. 24-27-00140), https://rscf.ru/project/24-27-00140/. The equipment of the center for collective use “Isotopic and Geochemical Research” of IGC SB RAS (Irkutsk, Russia) was used. The authors thank Taisa Pastushkova, Irina Voronova and Nikolay Bryansky for assistance in analytical studies. We would like to express our special gratitude to all geological services of the “Matrosov mine” public corporation (Magadan, Russia) for comprehensive assistance in conducting fieldwork. We are also greatly indebted to anonymous reviewers for valuable comments.

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