Metallogenic features of the Central Donbass and Bobrikovskoe gold deposit

The article presents the results of studying the metallogenic features of the Central Donbass. The relevance of the research is determined by the need to develop scientific and methodological foundations for creating predictive prospecting models of gold deposits adapted to the conditions of the Central and Eastern Donbass. Metallogenic analysis was used as the main research method. It has been established that the metallogenic feature of the Central Donbass is the selective occurrence of gold deposits and ore occurrences in a series of brachymorphic folds formed as a result of undulation of the hinge of the Main Anticline of Donbass, as well as similar parallel anticlines and transverse uplifts, in the complete absence of magmatism. The ore-bearing complex is represented by strata of interlacing pelitic, silty and psammitic sedimentary rocks in a earboniferous coal-bearing formation containing dispersed organic matter and scattered pyrite inclusions in the main mineral tissue. The ore-bearing rocks underwent postsedimentation transformations under conditions of early and late catagenesis and metagenesis, in the absence of signs of near-ore metasomatic changes. A variety of ore mineralizations and their zonal distribution have been revealed. The main gold mineralization zone is highlighted. Up to the ore column, through the transitional subzone of gold-polymetallic ores, it is replaced by a zone of mercmy-antimony mineralization. It is shown that the localization of the gold ore bodies of the Bobrikovskoe deposit is confined to a brachymorphic anticline composed of black shale rocks of the ore-bearing complex and complicated by faults of upsurge-shear kinematics, with the complete absence of signs of magmatism. The ore bodies are represented by volumetric quartz-vein-veined and sulfide-interspersed mineralizations located one below the other at depths from 0 to 270 m and from 570 to 1200 m, respectively. The main useful minerals are native gold and electrum, small particles of which are localized in pyrite and arsenopyrite in association with galena, sphalerite and sulfosalts. The metallogenic features of the region indicate the possibility of classifying gold ore objects to the so-called black shale type.