The duration of formation of mobile zones of Caledonides, Hercynides, Kimmerides and Alpides is on average the same and is 160+/-15 Ma. The ratio of the time of formation of orogenic structures to geosynclinal structures proper in the mobile zones hosting large stratified deposits of lead and zinc is 10 %, volcanogenic copper-zinc deposits - 33 %, and rare-metal (Sn, W, Mo, Ai) - 75 %. This circumstance is connected, apparently, with the degree of warming of the Earth's crust and its processing by mantle fluid flows.

Application of decryptometric survey for disassembling bearing rare-metal mineralization of granite massif of East Transbaikalia gave positive results. Two types of decryptograms are observed. The first one, with a distinct maximum in the temperature range of 300-550 °С, is characteristic for samples from steaming halos of unpromising Taptanai and Sakhanai massifs. The second, with distinct maxima at temperatures of 120; 250 and 400-600 °С, is characteristic of samples from the halos of the Dedonogorsky and Etykinsky massifs, which are associated with industrial rare-metal mineralization.

Deposits of rock crystal in the Subpolar Urals were discovered in the thirties, when exploration work with the purpose of finding primary sources was based on the findings of surface placers of quartz crystals. Later, the main attention of geologists who studied and explored rock crystal deposits was directed to the study of conditions of formation and regularities of location of crystal bodies. Great progress has been made in solving this problem, and at present a considerable number of indirect signs have been established that indicate the possibility of finding blind nests of rock crystal in a given area.

One of the essential questions arising in the analysis of ore field structures is to establish the measure and nature of the influence of the specific physical and mechanical properties of the host rocks on the shape and spatial position of ore objects. Interesting materials on this iss. were obtained during the study of deposits of Suraizskoe crustalene field of the circumpolar Urals. A great role belongs here to the type of structures of unlensing developed in the host rocks.

Until very recently, a common view of pegmatite genesis has not been established among a large circle of geologists studying pegmatite deposits. A. E. Fersman's theory of pegmatite formation is still widely popular. The enormous work of A. E. Fersman and his group of colleagues, aimed at collecting materials characterizing the mineral composition of pegmatites in almost all regions of the USSR, played a major positive role, attracting general attention to these deposits and thereby facilitating their rapid industrial development. This group of researchers rightly established that the formation of pegmatites is a very complex process occurring in changing physicochemical conditions and that, in accordance with changes in crystallization conditions, the paragenetic associations of the resulting minerals change. However, a number of fundamental provisions of A. E. Fersman's general theory of pegmatite genesis, as is known, have not been justified. A. E. Fersman's ideas that pegmatites are formed by means of successive crystallization in a closed system, the so-called pegmatite water-fire melt, highly enriched in volatile components, have long been met with objections.

In the summer of 1910, participating as a lecturer in the compilation of a geological map of the Mount Vysokaya (the work was carried out by Professor V. V. Nikitin at the invitation of the Board of the Nizhnii-Tagil Plants), I compiled a collection of rocks. This may be of interest for elucidating the composition of the constituent rocks, as well as the genesis of the origin of this large deposit of magnetic iron ore.