Purpose. Substantiate the method of typification of oil deposits of the Dnipro-Donetsk basin to create their classification by metal content. The relevance of such studies is due to the strengthening of requirements for environmental protection and comprehensive processing of mineral resources, which is determined by a number of Ukraine laws, resolutions of the Cabinet of Ministers, as well as the requirements of the State Commission on Mineral reserves to the quality and content of geological materials. Methodology. The factual basis of the work was the results of X-ray fluorescence analyzes of metal content in oils from the deposits of the Dnipro-Donetsk basin. These results were statistically processed with calculations of descriptive statistics and assessment of the peculiarities of the distribution of metal contents in oil from each field to justify the choice and calculation of normalized contents. Given that one of the most effective procedures for simplifying and minimizing the data set to create natural classifications is cluster analysis, to achieve this goal, clustering of oil deposits was carried out by various methods, which are implemented in the most popular professional statistical software platforms “STATISTICA” and “SPSS”. Results. To perform a cluster analysis of metal contents of 36 deposits of the Dnipro-Donetsk basin: Bakhmachsky, Pryluky, Krasnozayarsky, Kachalivsky, Kremenovsky, Karaykozovsky, Korobochkinsky, Kulychikhinsky, Lipovodolinsky, Monastyrychovsky, Marastyrishchevsky, Malostyrishchevsky, Malostyrishchevsky, Malostyrishchevsky, , Raspashnovsky, Sofiyivsky, Sukhodolivsky, Solontsivsky, Solokhivsky, Talalayevsky, Trostyanetsky, Turutynsky, Kharkivtsy, Shchurynsky, Yuryevsky, Yaroshivsky, Khukhryansky, Sagaidatsky №1, Sagaidatsky №13, Kybybitsy, Kyshtsy №5 №56 and Kybytsivsky №1 by different methods, analysis of clustering results and substantiation of selection of the most optimal of them for further development of natural classification of deposits by metal content in oils. Scientific novelty. To establish a weighted centroid method of cluster analysis, as the most optimal for the subject-free researcher division of oil fields by metal content (including vanadium) into taxa. Practical significance. The practical significance of the results of the work is that the constructed dendrograms of clustering of deposits by vanadium content in oils can be used as a basis for developing classifications of these deposits for environmental and technological assessment in the future. The proposed methodological approach can be used in the future to divide other groups of geological objects into natural taxa. Key words: oil fields, X-ray fluorescence analysis, metals, cluster analysis, dendrogram, weighted centroid method.

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A modern and scientifically based indicators forecast of toxic and potentially toxic element concentrations allows us to develop and plan organizational and technicaltechnological measures aimed at reducing the negative impact of the coal industry and heating enterprises on the ecological state of the environment. For this purpose it is necessary to have data about concentration, character and features of the distribution of toxic and potentially toxic elements, including nickel, lead and chromium in coal and the rocks that contain it. Toxic elements are one of the main sources of environmental pollution thatnegatively affects human health. Research in this direction is conducted to reduce the degree of negative effects and additional pollution of the environment. Increasing requirements for environmental protection in the coal-mining industry sector of Ukraine stipulates the need for new scientifically grounded methods for forecasting the content of toxic and potentially toxic elements in the rock mass which is extracted by mines, the waste of coal extraction and coal enrichment and also the influence of the coal-heating enterprises on the environment. In the article, the results of investigations of toxic elements in coal seams of the Donetsk-Makiivka geological and industrial area of the Donbas are considered. The research covered the whole territory of one of the most studied geological and industrial districts of the Donbas – Donetsk-Makiivka. As a result of the study, correlation coefficients were calculated that allow us to predict the concentration of nickel, lead and chromium in the products and wastes of coal enrichment and correct the technological schemes of coal enrichment taking into account their content. We also calculated the regression equation between these elements and the ash content of the coal, which will allow us to predict their concentration in the main working coal seams of the DonetskMakiivka geological and industrial districts relative to the values of coal ash content. The character of the distribution is established and the weighted average concentrations and basic descriptive statistics for nickel, lead, and chromium in the coal seams and suites are calculated. The composition and character of their typomorphic geochemical associations, as well as the features and regularities of their accumulation in the coal seams of the Donetsk-Makiivka geological and industrial districts are revealed.

Purpose. Investigation of regularities of mercury distribution in coal of formation c7n of the Pavlogradska mine field. Methodology. Method of atomic absorption analysis of furrow samples of wells. Processing of geochemical and structural-geological data by methods of mathematical statistics using Excel 2016 and Statistica 6.0. The computer program Surfer was used to build maps/ Results. In article considered the distribution of mercury in the coal seam c7н of the Pavlohradska mine field of the Pavlohrad-Petropavlivka geological and industrial district of Donbas. As a result of the study, a map of isoconcentrates and a map of the regional component of mercury content in the coal of the seam were constructed and analyzed. Correlation coefficients between mercury concentration and formation morphological parameters and coal sulfur were calculated. The regression equations between this element and the ash content of coal are also established, which will allow predicting their concentration in the main working coal seams of the geological-industrial area relative to the values of coal ash content. The nature of sulfur distribution is established and the weighted average concentrations and the main descriptive statistics of this element are calculated. Scientific novelty. Peculiarities and regularities of mercury accumulation in coal of formation c7n are revealed. Practical significance. The constructed maps and established correlations are the factual basis for long-term forecasting of mercury concentrations in extracted raw materials and adjustment of technological schemes of coal beneficiation. Keywords: mercury, mine, coal height, ash content, stratum depth, sulfur content, regression equation, correlation coefficient.