The service life of the applied equipment is from 50 to 57 years. The following factors have a significant impact on the efficiency of flotation equipment: As a result of the mentioned reasons, there was a decrease in the degree of extraction and losses of valuable components in the final tailings of production, as well as frequent emergency downtimes of old flotation equipment. In May 2018, the head of the DSROP Tatyana Oleynikova initiated the project “Modernization of slime flotation of the Main Building-1 of the Zhezkazgan concentrating mill No. 1.” After the preparation of the design specifications and estimates and passing the state examination of detailed design in February 2019, construction and installation works were started with the complete demolition of old foundations and columns and the erection of new ones. Instead of 112 mechanical multi-compartment cells (volume 6,3m³) Mekhanobr-7, 28 pneumatic mechanical multi-compartment cells (volume 25m³) MEK-25 (Russia) were installed that are equipped with automated pulp level and airflow rate control systems. The project also provides for the installation of the powerful air blowers for supplying process air KUBÍČEK (Czech Republic) and the Atlas-Copco compressor (Sweden) for instrumentation, control and automation equipment. According to the project manager Aydin Espayev, due to the well-coordinated work of the project participants, they managed to achieve the early launch of the equipment a month earlier than the approved date and save about 20% of the investment money allocated for the project. At the stage of commissioning works, the staff was trained in the operation of the newly installed equipment, which had a positive impact on the overall qualification of the mill staff. According to the preliminary calculations, the successfully implemented project will ensure: In turn, it will provide a significant economic effect and return on investment within a short time.