The results of a comprehensive detailed study of the vein structure, mineral zoning of veins, and mineral typomorphism of the Shakhtama deposit obtained on the basis of new samples from poorly studied horizons are given. The results obtained show that the Mo resources of the deposit are far from being exhausted, and the typomorphic features of ore minerals indicate that base metal mineralization associated with Au (Ag), also continues to a depth, along with Mo. The presence of rare Sr mineral, svanbergite, in the Shakhtamа deposit and the typomorphic properties of ore minerals testify in favor of the near-surface origin of the exposed mineralization. The succession of mineral formation has been established. Based on the study of ore and metasomatic zonality, fluid inclusions and isotopic data, as well as the composition of structural impurities in molybdenite, conclusions were made of the formation conditions of ore mineralization in a porphyry ore-forming system.

The results of a comprehensive detailed study of the vein structure, mineral zoning of veins, and mineral typomorphism of the Shakhtama deposit obtained on the basis of new samples from poorly studied horizons are given. The results obtained show that the Mo resources of the deposit are far from being exhausted, and the typomorphic features of ore minerals indicate that base metal mineralization associated with Au (Ag), also continues to a depth, along with Mo. The presence of rare Sr mineral, svanbergite, in the Shakhtamа deposit and the typomorphic properties of ore minerals testify in favor of the near-surface origin of the exposed mineralization. The succession of mineral formation has been established. Based on the study of ore and metasomatic zonality, fluid inclusions and isotopic data, as well as the composition of structural impurities in molybdenite, conclusions were made of the formation conditions of ore mineralization in a porphyry ore-forming system.

An Erratum to this paper has been published: https://doi.org/10.1134/S1028334X22330017

Rare minerals represented by oxides, fluorides, F-carbonates and REE arsenates in association with monazite-Ce, monazite-Th, xenotime-Y and zonal REE fluorite were identified in the rare-metal ores of the Sn–W deposits of Lesser Khingan, Amur region. Rare lanthanide minerals are described, including fluocerite, bastnaesite, and gasparite-Ce, which was found for the first time in Russia in the Sn–W greisens, and chernovite-Y, the second find in the greisens of the Russian Far East. The influence of arsenic fluids at the late hydrothermal stage caused the replacement of xenotime-Y and monazite-Ce by diverse REE minerals with different lanthanide proportions. It is found that these minerals differ in chemical composition from the same minerals described in other deposits elsewhere. Due to the variable valence state of arsenic and the complete isomorphism between rare earths, arsenates can be used as indicators of redox conditions of their deposition.

In the Sn–W greisen deposits of the Karadub ore field, rare arsenates of REEs chernovite-(Y) and gasparite-(Ce), associated with topaz, fluorite, fluocerite, and bastnaesite, have been identified. They replace early xenotime-(Y) and monazite-(Ce). Chernovite-(Y) and gasparite-(Ce) from Sn–W greisens differ in their chemical composition from the same minerals previously described elsewhere. Chernovite-(Y) differs in the minimum content of Y with only 0.47 to 0.26 atoms in the formula (a.p.f.) and a relatively high content of light REEs of 0.111–0.254 (a.p.f.). Gasparite-(Ce) has a high Nd content of 0.28 (a.p.f.). REE arsenates were formed by substituting xenotime (Y), monazite (Ce), and REE-bearing fluorite under strongly oxidizing conditions.

The colloform tin ores from the deposit Verkhnee at the Primorye have been studied with the aid of X- ray spectroscopic microanalysis and the scanning electron microscopy with the energy dispersive analyzer LINK-ISIS that allowed revealing the primary and the secondary zoning of a colloform cassiterite and to determine the phase composition of these formations. The primary zoning of the mineral forms at the early stage of the deposition of stannates from colloidal solutions and is characterized by the alternation of hydrostannates of various composition. The secondary zoning is superimposed zonality, and it forms at the process of the stannate crystallization. The metacolloidal varieties of concentric-zonal aggregates are produced by hydrostannates of Ca, Fe, Cu, In, of variable compositions, soluble in acids, in which the admixtures of As, Al, Si, Cd, Co, Sb, Zn, Ag are marked. Sn content according to the energy dispersive analysis is 42—54%. Infrared adsorption spectroscopy allowed finding out in hydrostannates the presence of the hydroxyl water at the area of the valence vibrations Sn-OH. In the colloform cassiterite a new phase Pb5 As2 O8 with various correlation of Pb and As in size 30—50 mk has been found.

The colloform tin ores from the deposit Verkhnee at the Primorye have been studied with the aid of X- ray spectroscopic microanalysis and the scanning electron microscopy with the energy dispersive analyzer LINK-ISIS that allowed revealing the primary and the secondary zoning of a colloform cassiterite and to determine the phase composition of these formations. The primary zoning of the mineral forms at the early stage of the deposition of stannates from colloidal solutions and is characterized by the alternation of hydrostannates of various composition. The secondary zoning is superimposed zonality, and it forms at the process of the stannate crystallization. The metacolloidal varieties of concentric-zonal aggregates are produced by hydrostannates of Ca, Fe, Cu, In, of variable compositions, soluble in acids, in which the admixtures of As, Al, Si, Cd, Co, Sb, Zn, Ag are marked. Sn content according to the energy dispersive analysis is 42—54%. Infrared adsorption spectroscopy allowed finding out in hydrostannates the presence of the hydroxyl water at the area of the valence vibrations Sn-OH. In the colloform cassiterite a new phase Pb 5 As 2 O 8 with various correlation of Pb and As in size 30—50 mk has been found.

Ванадиевый травяно-зеленый дравит обнаружен в маломощных (до 10 см) кварцевых жилах, пересекающих черные кремнистые сланцы позднего протерозоя, обогащенные ураном и ванадием (до 50 ppm). Содержание V2O3 в – до 5.34% при низком содержании железа и повышенном магния. По всей вероятности, ванадий занимает в структуре минерала в основном Z-позицию. Получены спектры диффузного отражения в диапазоне 350–2500 нм и люминесценции при возбуждении УФ-излучением N-лазера. Появление ванадия в качестве хромофора и люминофора в метаморфических породах интерпретируется как индикатор древних океанических структур на континентах. В статье 11 рисунков, 2 таблицы, 21 литературная ссылка.

Les mineraux du groupe du platine provenant du complexe de Konder, ultrabasique, alcalin et zone, situe a l'est du bouclier d'Aldan, en Russie orientale, sont surtout representes par l'isoferroplatine, formeen deux generations, les deux ayant des teneurs en fer allant de 7.5 a 11.5% (poids). Une generation de haute temperature est saturee avec les autres elements du groupe du platine sous forme d'impuretes: jusqu'a 5.3% Ir, 2.9% Os, et 1.8% Rh (base ponderale). En revanche, l'isoferroplatine tardif contient moins de 1.9% Ir, 1.0% Os, et 0.6% Rh. Parmi les mineraux accessoires du groupe du platine, on trouve une grande variete de solutions solides faisant partie du systeme Os-Ir-Rh-Pt, tetraferroplatine, tulameenite, hongshiite, mineraux des series erlichmanite-laurite et irarsite-hollingworthite, sperrylite, bismuthures, antimoniures, tellurures, stannures, et hydroxydes. Les assemblages contiennent possiblement de nouvelles especes minerales: ruthenium natif, l'analogue palladifere de la hongshiite, Pt 2 As 3 , et l'analogue platinifere de la konderite et de l'inaglyite, entre autres, qui forment des liseres autour des grains d'isoferroplatine et des inclusions dans cette phase. Nous observons pour l'or une morphologie et une distribution semblables a celles de l'isoferroplatine; l'or est lie a de rares lentilles de sulfures et des impregnations dans la dunite (or de haute temperature, porteur de Cu, Pt, et Pd), et des venues de monzodiorite recoupant la dunite (or en moyenne ou faible teneurs, a faible contenu en impuretes).