This article examines the thermal and chemical properties of limestone from the “Uch o‘jaq” deposit. During the study, the samples were analyzed using thermographic, X-ray phase, and chemical methods. The results showed that the limestone from this deposit is rich in calcite and also contains components important for the production of Portland cement clinker, such as dolomite, quartz, and iron oxides. Thermographic analysis recorded the limestone’s response to heating and the characteristics of the calcite crystal lattice decomposition. Based on the obtained data, it was established that the limestone from the “Uch o‘jaq”deposit is an important mineral raw material as a carbonate component in the production of Portland cement.