The Kola Superdeep Well (SG-3) is an outstanding achievement of Soviet science and technology, drilled in Precambrian crystalline rocks and reached a depth of 12262 m. It was one of a series of super deep wells planned within the framework of the program “Earth's Interior Exploration and Superdeep Drilling”. In order to achieve record depths, unique domestic drilling equipment and materials capable of working at high temperatures and pressures were created. A fundamentally new technology for drilling wells using hydraulic downhole motors was developed. Despite difficult drilling conditions and repeated acci-dents, SG-3 has fulfilled almost all the tasks assigned to it. The well was penetrated with full core sampling, which was subjected to comprehensive study. This made it possible to study the deep structure of the Earth's crust and to revise the interpretation of depth seismic data. It was found that changes in the physical properties of rocks at great depths had been erroneously interpreted as a change in their composition. It made it possible to assess the prospects of deep horizons of the Pechenga structure for copper-nickel mineralisation by uncovering a previously unknown body of ore-bearing hyperbasites. New information was obtained on the temperature gradient, which turned out to be significantly higher than expected, as well as on the vertical metamorphic zoning along the borehole section. The composition and physical properties of rocks in deep horizons were investigated. Tectonic fault zones and six types of ore mineralisation were identified in the borehole section. New data on ore formation processes at great depths have been obtained, which is an important contribution to the theory of mineral deposit formation

Individual fluid inclusions with dense carbon dioxide hosted in quartz from the gold-bearing interval penetrated by the SD-3 Kola Superdeep Borehole were studied using modern techniques. The composition and density of the carbon dioxide fluid were determined by Raman spectroscopy and microthermometry. The density of the fluid is 0.37–1.14 g/cm³ and contains minor admixtures of nitrogen (0.3–1.8 mol %) and water (0.1–0.4 mol %). LA-ICP-MS data indicate that the carbon dioxide fluid inclusions contain high concentrations of Au (1–2611 ppm) and Ag (1–4389 ppm), and high-precision optical data indicate that the high-density CO₂ fluid of the inclusions contains Au–Ag nanoparticles. Evidently, gold and silver were transported from the Earth’s mantle to the crust by high-density carbon dioxide fluid in the form of nanoparticles.

Based on the geographical atlases of the 16th century, the German scientist G. Leibniz proposed to Peter I a project aimed at discovering a strait between Asia and America, studying the Earth’s magnetic field, cartographic and other research in Russia. In December 1724, Peter I signed a decree on equipping the expedition, which was called the First Kamchatka Expedition (1725–1730). In 1732, the expedition of I. Fedorov and M.S. Gvozdev through the Bering Strait approached the northwestern coast of America in the area of Cape Gvozdev (now — Cape Prince of Wales). At the same time, members of the Admiralty Board N.F. Golovin and T. Sanders proposed organizing Russian round-the-world voyages and creating a Pacific Fleet to protect Russia's Far Eastern borders. In 1741, the Second Kamchatka Expedition of V.I. Bering and A.I. Chirikov explored the northwestern coast of America and the islands of the Aleutian ridge. In 1763, M.V. Lomonosov justified the possibility of passing the Northern Sea Route through the Pole to Kamchatka. In 1764–1769, by the order of Catherine II, K. Krenitsyn and M.D. Levashov sent a secret expedition to the Bering Strait, which initiated a systematic mapping of the Aleutian Islands and Alaska. The expedition of I. Billings and G.A. Sarychev (1785–1796) resulted in the publication of maps of the Pacific Ocean. By the beginning of the 19th century, the question of the sea route to the Atlantic from the Bering Sea through the Arctic Ocean remained open. I.F. Kruzenshtern developed his own plan for organizing round-the-world voyages and received state support. Emperor Alexander I granted the request of the head of the Russian-American Company, N.P. Rezanov about sending goods to the Pacific colonies by sea and establishing interstate relations with Japan, which made it possible to equip the first Russian round-the-world expedition under the command of I.F. Kruzenshtern and Yu.F. Lisyanskiy (1803–1806).

A new interpretation of the geological and seismic data demonstratd a correlation between the surface structures of endogenic ore regions of the Baltic Shield, the Moho surface relief, and local...

In the Middle Ages, the Russian state, formed around Moscow, was in dire need of metals. However, only comparatively poor quality swamp iron was mined on the territory of the Russian principalities. There were no deposits of copper, silver, gold, or any other nonferrous metals, and all these metals had to be purchased abroad, paying mainly in furs. At the same time, the supply of metals was constantly threat-ened by bans from Western countries. In the 15th century, during the reign of Ivan III, under the influence and with the active help of his wife Sophia Palaiologina, the Muscovite state was strengthened and developed, which required more and more financial resources. The development of artillery created a need for large quantities of copper. There was an urgent need for own metal deposits, the search for which began in the vast northern Novgorod lands, annexed to the Moscow state. In 1491, the first state ore prospecting expedition was sent to the Pechora River basin, with the participation of ore explorers from Western Europe, which discovered copper and silver ores on the Tsilma River. The Tsilemskoye deposit was the first developed ore deposit in the history of the Russian state. The first copper smelter was built here. Therefore, 1491 is considered to be the beginning of the mining and metallurgical industry in the Russian state. This expedition marked the beginning of prospecting, exploration and mining in the newly annexed lands of the Urals and Siberia, where new ore deposits were later found, which served to create the mineral resource base of Russia.