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Purpose. To study conditions of forming the zones of high metal concentration in metal-containing man-made deposits. To assess the likelihood of metal concentration in the placer core.Methods. Analysis of the conditions determining metal-containing placers formation and of metal losses at mining and processing plants, considering the local terrain. Findings.It is proved that the minerals that are carried away from the separators at mining and processing plants are concentrated in the core, which contains up to 90% of heavy metals.Originality. The studies have determined the main factors and regularities governing the distribution of heavy metals in technogenic placers, which help identify their location and calculate parameters of high metal concentration zones in the body of a man-made deposit.Practical implications. The research has proved the possibility of using metal-containing technogenic placers, and finding the zones of maximum metal concentration on the basis of the established regularities. The authors have developed a mathematical model of the gradual formation of technogenic deposits with zones of heavy metals concentration in metal-containing waste.

The article contains research materials on the storage of man-made deposits, including phosphogypsum dumps. The consequences of long-term operation of phosphogypsum dumps and their negative impact on the environment have been established. The quantitative content of microelements to the soil within the storage of technogenic phosphogypsum deposit was determined. Graphical dependences of phosphorus, manganese, fluorine, mobile sulfur, zinc, nickel content depending on the depth of sampling and distance from phosphogypsum dumps to settlements and the Goryn River are presented. The directions of processing and utilization of the given waste are offered. The elemental composition of phosphogypsum dumps of PJSC "Rivneazot" has been established, in particular, the presence of a group of valuable rare earth elements.

The article presents basic information about the method of hydromechanical extraction of amber from amber-containing rocks, water-sludge scheme and classification scheme. The constructive scheme of the vibroclassifier is also presented, which is based on the principle of using the influence – vibration and bubbling of the suspension by air bubbles. Studies of the separation process and distribution of fractions in multidisperse liquid on a vibroclassifier of complex action were performed. The obtained theoretical and graphical dependences allowed to establish changes in the parameters of the velocity of sand and amber particles in the bath of the vibroclassifier on the size of fractions and density of the suspension, focusing on the size of amber up to 5mm. At the same time, the problem of determining the dependence of the transition coefficient from the rate of free to the rate of compressed deposition on the density of the suspension and the size of the fractions was solved. Dependencies have been established that have a theoretical justification for the physical process and that describe the experimental data on the Rayleigh curve.

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