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Документ Research into the process of preparation of Ukrainian coal by the oil aggregation method(Технологический центр, 2017) Biletskyi, V. S.; Molchanov, P.; Sokur, M.; Gayko, G.; Savyk, V.; Orlovskyy, V.; Liakh, M.; Yatsyshyn, T.; Fursa, R.We conducted a study into concentration of Donetsk coal with varying degrees of coalification – anthracite and grade G – by the method of oil aggregation. We determined the character of impact of the following factors on the results of oil aggregation of coal: the ash content of original coal, pulp agitation duration, pulp density, consumption and type of reagent-binder. The research demonstrated a possibility of effective preparation of finely- and thinly dispersed Donetsk coal the size of 0–0.1; 0–1(2) mm and ash content from 10–15 % to 65–70 % by the method of oil aggregation. In this case, it was established that with an increase in the ash content of original coal, the process of oil aggregation displays a capacity of self-leveling. By reducing the speed of aggregation, it is possible to attain practically stable technological results over the entire examined range of ash content of original coal – from 10–15 % to 65–70 %. Obtained results substantiate the possibility of employing the process of oil aggregation for the re-preparation of waste, in particular, waste of flotation and gravitation separation of coal preparation.Документ Stone age and the world of primitive mining(Український культурологічний центр, 2018) Gayko, G.; Biletskyi, V. S.; Hunchenko, Yu.The role of the primitive mining in providing civilization advancement of the Stone Age communities is shown. The ways of the first minerals development are explored. The technological techniques and mining tools used by miners of the Neolithic flint extraction mines as well as the methods of clay extraction and usage are analyzed. The formation of the established mining communities and their role in obtaining and sharing professional experience is researched. Attention is drawn to the insufficient considering the factors of primitive mining activity in the developing historical scientific notations about the late Stone Age social development.