DEVELOPMENT OF TECHNOGENIC DEPOSITS IN THE ARCTIC COASTAL ZONES AS A TASK OF ECOLOGICAL ECONOMY

The article deals with the issues of circular economy in the development of coastal Arctic zones. At the same time, the development of technogenic deposits that were formed as a result of past economic activity is considered as a priority task of the ecological economy. A technogenic deposit for the extraction of placer gold in the Ust-Yansky district of the Republic of Sakha (Yakutia), which is located in the coastal Arctic zone, is considered as an object of research. The influence of this project on the socio-economic development of the territory, on the traditional nature use of the indigenous small-numbered peoples of the North, and the improvement of the environment is shown. Alternative options for the implementation of this project are considered. The socio-economic characteristics of the territory under consideration are given, the factors of the impact of the project for the development of a technogenic deposit on the state of the environment and the ethnological situation are identified. It is established that the development of a technogenic deposit for the extraction of placer gold in the stream. Suor-Uyalaah has significant economic and environmental significance, as it allows to extract a useful product by recycling waste, reduce the environmental burden by recultivating disturbed lands and returning cleared territories to agricultural circulation for the development of reindeer husbandry, gathering, and support of traditional crafts. In addition, this project will contribute to the creation of new jobs for small indigenous peoples, their receipt of additional income and improvement of the socio-economic situation in general.

Improving the technology of mature tailings processing at the Kovdorsky GOK

Introduction. Phosphate minerals are lost during flotation of mature tailings of the Kovdorsky GOK due to difficult mineral fractions and poor conditions for effective flotation of thin classes of phosphate minerals. Research aims to increase the efficiency of raw material processing at the technogenic deposit of the Kovdorsky GOK by optimizing the reagent regime and the scheme of dressing thin classes of mature tailings with the use of modern reagents-flocculants, selective depressors and collectors. Methodology. The developed regime of sludge preparation for flotation involves their thickening using the Praestol-2540 flocculant, condensed sludge product processing with a mixture of dispersant reagents (SSB, sodium carbonate and Neonol AF 9-8), its additional thickening, followed by combining the resulting ISSN 0536-1028 «Известия вузов. Горный журнал», № 5, 2020 65 sediment with the sand part of the tailings, their conditioning with the collector and feeding to the combined flotation with the use of the integrated collector according to the scheme with the middlings cycle. Results. The scheme and reactant regime of enrichment tailings of complex parts of technological fields has allowed to achieve recovery of P2O5 45% (from power source) and the mass fraction of P2O5 in Apatite of 37.1%, or 0.5 and 1.5% higher than when using the design scheme and technology. Summary. The developed technology of mature tailings processing at the Kovdorsky GOK ensures increased indicators of processing by means of creating the conditions for efficient flotation of fine classes of phosphate minerals.

Determination of the transfer step of the ore chute while mining the technogenic deposit of the bulk type

Further development of the open mining works on the domestic enterprises will be accompanied by the worsening of mining-geological conditions and declining of the quality of iron ore raw materials. In the same time, the accumulated mining wastes, that can make the technogenic deposits, pass into one of the important sources of the mineral raw materials. Taking into account this thing, the development and implementation of the modern technological circuits of the technogenic deposit development is an actual calling for mining industry, and determination and optimization of process conditions of the technogenic deposit development – is the scientific task of this publication. The obtained results of studies of the optimum step value of the ore chute transfer during the technogenic deposit development can be used by design organizations and mining enterprises for designing works. The obtained methodology and the proposed mathematical dependencies will reduce the cost of mining of the technogenic deposit due to the reasonable timely transfer of the open ore chute.