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Phase equilibria of the ternary Cu-Co-S system were studied within liquidus-solidus temperature range in the inert atmosphere at atmospheric pressure. Integrated application of such methods as differential thermal analysis, thermogravimetry, scanning electron microscopy, and electron probe microanalysis, makes it possible to determine phase transitions temperature and equilibrium phases composition in the system with high level of accuracy. Experimental results obtained in this work for the Cu-Co-S system are presented as liquidus and solidus surfaces projections of the Cu-Co-S system. Phase transformations occurring in the system are discussed.