ENGINEERING PETROLOGY OF METASOMATITES OF CHALCOPYRITE AND MAGNETITE-SKARN DEPOSITS OF THE URALS
We consider the specific features of metasomatically altered rocks and chalcopyrite-magnetite skarn deposits of the Urals. The regularities of changes in physical and mechanical properties of rocks at the metasomatic processes and the importance of metasomatic as engineering and geological features rock masses of endogenous deposits, largely determining their engineering-geological conditions are found. This is crucial for the Urals. Within the Ural fold belt, twenty-seven ore metasomatic formations controlling the placement of endogenous deposits of sixty ore formations were identified. The importance when studying metasomatic rocks along with physical and mechanical characteristics, is placed on their mineral and chemical composition. They play an important role at the opening of rock masses and the development of weathering processes. The most unstable in the supergene zone are the sulfidized metamorphic rocks (green slates ofactinolite - epidote-chlorite, quartz-chlorite-sericite composition, etc.) and metasomatic rocks. Oxidation of sulfides causes the formation of aggressive sulphate waters, weakening the strength characteristics of rock foundations of engineering structures. Regulatory documents, unfortunately, do not consider such consequences.