Based on the isotopic-geochemical analyses of zircons from granites of the Belokurikhinsky massif in the Gorny Altai using the U-Pb method, the ages of three intrusion phases have been determined for the first time: the age of the first phase refers to the time interval of 255-250 Ma, the second and the third phases have similar ages of about 250 Ma. The formation time of the Belokurikhinsky massif is estimated as not exceeding 5-8 Ma. The δ18O values for zircons from granites of the second and the third intrusion phases average around 11.5-12.0 ‰, indicating a significant contribution of a crustal component in the formation of the parent melts for granites of these phases. The crystallization temperature values of the zircons by the Ti-in-zircon thermometer for three phases range from 820 to 800 °C. The P-T crystallization parameters of titanite from the first phase, determined using a titanite thermobarometer, average around 770 °C and 2.7 kbar. The zircons from the first phase mostly exhibits geochemical characteristics of typical magmatic zircons. The zircons from the second and the third intrusion phases either may be unaltered magmatic zircons or enriched in incompatible elements (LREE, Th, U, Ti, Ca, etc.) due to fluid influence, resembling hydrothermal-metasomatic type zircons in terms of their geochemical characteristics. A number of zircon grains from the second and the third phases of granites demonstrate anomalous geochemical characteristics – the REE distribution spectra atypical for zircons (including “bird's wing” type spectra with oppositely tilted of light and heavy REE distribution profiles), as well as significantly higher contents of certain trace elements compared to other varieties. Such an enriched zircon composition and wide variations in the incompatible element content are due to non-equilibrium conditions of zircon crystallization and evolution of the fluid-saturated melt composition during the final stages of the massif formation.
Technogenic pollution of ecosystems causing by activity mining enterprises of Rudny and Mountain Altay revealed on basis biogeochemical indicators. Content of hard metals analyzed in different plants in mining enterprises that it absorb selectively from soil and air environment. Composition of hard metals in plants determine by composition of ores on the deposits. Anomalous content of Hg in the plant of Sinukhinskoe ore district link with process of cyanidation for selection of gold on the gold-extraction factory.
High rates of accidents and accident rates, as well as insufficiently substantiated methods (management activities) to reduce injuries and accidents hinder Russia's accession to the WTO, since when enterprises enter foreign markets it is desirable that management in the field of industrial accident prevention meets international requirements, i.e. complies with some standards, for example, ISO 14000 series, OHSAS 18000 series. In this regard, there is a need to develop a methodology for the development of the system of prevention of occupational injuries at mining enterprises, ensuring a sustainable level of accidents and accident rate reduction.
